JP2000313660A - Dielectric ceramic composition - Google Patents
Dielectric ceramic compositionInfo
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- JP2000313660A JP2000313660A JP11119134A JP11913499A JP2000313660A JP 2000313660 A JP2000313660 A JP 2000313660A JP 11119134 A JP11119134 A JP 11119134A JP 11913499 A JP11913499 A JP 11913499A JP 2000313660 A JP2000313660 A JP 2000313660A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、誘電体磁器組成
物、特にマイクロ波領域で使用される誘電体共振器や温
度補償用誘電体の材料として用いられる誘電体磁器組成
物に関する。The present invention relates to a dielectric porcelain composition, and more particularly to a dielectric porcelain composition used as a material for a dielectric resonator used in a microwave region or a dielectric for temperature compensation.
【０００２】[0002]
【従来の技術】近年における携帯電話等の高周波機器の
小型化、高機能化、低価格化の急速な進行に伴い、これ
ら高周波機器に使用される誘電体共振器にも同様に小
型、高性能且つ低価格なものが望まれている。これら誘
電体共振器等の材料として用いられる誘電体磁器組成物
には、比誘電率が高く、Ｑ値が高く、さらに静電容量の
温度依存性が低い特性のものが要求される。比誘電率が
高いと共振器の小型化が容易になるからであり、Ｑ値が
高いと共振器の誘電損失が低くなるからであり、さらに
静電容量の温度依存性が低いと周囲の温度変化に対して
前述のような特性の変動が抑えられるからである。特
に、静電容量の温度特性に関しては、ＥＩＡ規格で規定
されているＮＰＯ特性を満足するのが好ましい。ＮＰＯ
特性とは、＋２５℃における静電容量を基準としたと
き、−５５〜１２５℃の広い範囲にわたり静電容量の温
度変化率が±０．３％以内と平坦である特性という意味
である。2. Description of the Related Art With the rapid progress of miniaturization, high functionality, and low price of high-frequency devices such as mobile phones in recent years, dielectric resonators used in these high-frequency devices have been similarly miniaturized and have high performance. What is desired is a low-priced one. The dielectric porcelain composition used as a material for these dielectric resonators and the like is required to have a characteristic having a high relative dielectric constant, a high Q value, and a low temperature dependence of capacitance. This is because a high relative dielectric constant facilitates the miniaturization of the resonator, and a high Q value decreases the dielectric loss of the resonator. This is because such a change in the characteristic as described above can be suppressed. In particular, it is preferable that the temperature characteristics of the capacitance satisfy the NPO characteristics defined by the EIA standard. NPO
The characteristic means a characteristic in which the temperature change rate of the capacitance is flat within ± 0.3% over a wide range of −55 to 125 ° C. with reference to the capacitance at + 25 ° C.
【０００３】このような特性を満足する誘電体磁器組成
物として、日本国特許公開公報である特開平７−１８７
７７３号には置換バリウム−ネオジウム−チタン−ペロ
ブスカイトを用いた誘電体磁器組成物が開示されてい
る。さらに、この誘電体磁器組成物は、置換バリウム−
ネオジウム−チタン−ペロブスカイトに二酸化ケイ素を
添加物として含むと、１４００℃以下の低温焼結が可能
となることも開示されている。誘電体磁器組成物を製造
するために低温で焼結できることは、誘電体磁器組成物
の低価格化のために非常に重要である。焼結温度が高い
と電力費がかさんでしまい、高温用炉が必要となりまた
誘電体磁器組成物の材料を当該高温用炉に入れるための
セッター、サヤ等も高温に耐えるものが必要となるので
設備投資が莫大になってしまうからである。[0003] As a dielectric porcelain composition satisfying such characteristics, Japanese Patent Laid-Open Publication No. Hei 7-187, Japanese Patent Publication No.
No. 773 discloses a dielectric porcelain composition using a substituted barium-neodymium-titanium-perovskite. Further, the dielectric porcelain composition has a substituted barium-
It is also disclosed that when silicon dioxide is added to neodymium-titanium-perovskite as an additive, sintering at a low temperature of 1400 ° C. or less is possible. The ability to sinter at a low temperature to produce a dielectric porcelain composition is very important for reducing the cost of the dielectric porcelain composition. If the sintering temperature is high, the power cost increases, a high-temperature furnace is required, and a setter for putting the material of the dielectric ceramic composition into the high-temperature furnace, a sheath, and the like also need to withstand high temperatures. This is because equipment investment becomes enormous.
【０００４】誘電体磁器組成物が積層セラミックコンデ
ンサとして用いられる場合、内部電極として従来から用
いられているPd,Pt,Au等の高価な金属の代わりに、安価
なAgを用いるか又は高価な金属にAgを多量に混合させる
ことが低価格化のために有効であることが知られてい
る。AgはPd等の高価な金属と比較して１０００℃以下と
融点が低いので、内部電極として安価なAgを用いるため
にも低温焼結が望ましい。When a dielectric ceramic composition is used as a multilayer ceramic capacitor, inexpensive Ag or expensive metal is used instead of expensive metals such as Pd, Pt, and Au conventionally used as internal electrodes. It is known that mixing Ag in a large amount is effective for cost reduction. Ag has a lower melting point of 1000 ° C. or less than expensive metals such as Pd, so that low-temperature sintering is also desirable in order to use inexpensive Ag as an internal electrode.
【０００５】さらに、誘電体磁器組成物の原料として
は、鉛などの有害物質を含まないことが、環境の面から
望まれていた。Further, it has been desired from the viewpoint of the environment that the raw materials of the dielectric ceramic composition do not contain harmful substances such as lead.
【０００６】[0006]
【発明が解決しようとする課題】本発明はこのような事
情に鑑みてなされたものであり、本発明の目的は、比誘
電率及びＱ値が高く、ＮＰＯ特性を満足し、且つ焼結温
度が９５０〜１０００℃と低温焼結が可能であり、且つ
鉛等の有害物質を成分として含まない誘電体磁器組成物
を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a high dielectric constant and a high Q value, satisfy NPO characteristics, and maintain a high sintering temperature. It is an object of the present invention to provide a dielectric ceramic composition which can be sintered at a low temperature of 950 to 1000 ° C. and does not contain a harmful substance such as lead as a component.
【０００７】[0007]
【課題を解決するための手段】本発明に係る誘電体磁器
組成物は、特許請求の範囲に記載の成分を有することを
特徴とする。The dielectric porcelain composition according to the present invention is characterized by having the components described in the claims.
【０００８】本発明者らは、比誘電率が６０以上で、静
電容量の温度依存性がＮＰＯ特性を満足し、且つ焼結温
度が９５０〜１０００℃の低温焼結が可能な磁器組成物
を得ることを目標として研究及び実験を進めた結果、上
記の如き本発明の誘電体磁器組成物がこの目標を達成す
ることを見出したものである。The present inventors have proposed a porcelain composition having a relative dielectric constant of 60 or more, a temperature dependency of capacitance satisfying NPO characteristics, and a sintering temperature of 950 to 1000 ° C. capable of low-temperature sintering. As a result of conducting research and experiments with the aim of obtaining the above, it has been found that the above-described dielectric ceramic composition of the present invention achieves this goal.
【０００９】[0009]
【００１０】以下、本発明に係る誘電体磁器組成物の製
造方法を説明し、当該製造方法により製造された誘電体
磁器組成物の電気的特性及びこれら磁器組成物の組成を
あらわした表を参照して、本発明の実施例を詳細に説明
する。Hereinafter, a method for producing a dielectric porcelain composition according to the present invention will be described, and reference will be made to a table showing the electrical characteristics of the dielectric porcelain composition produced by the production method and the compositions of these porcelain compositions. Then, an embodiment of the present invention will be described in detail.
【００１１】本発明の好ましい実施例の一つは、単板型
のセラミックコンデンサに用いられる誘電体磁器組成物
である。One preferred embodiment of the present invention is a dielectric ceramic composition used for a single-plate type ceramic capacitor.
【００１２】本願発明に係る磁器組成物の主成分は、以
下のようにして作成された。BaTi4O9は、BaCO3及びTiO2
を出発原料として目的の組成になるように秤量後、水を
溶媒としてイットリア安定化ジルコニアのボールを用い
て３時間湿式混合を行った後乾燥した。得られた混合粉
体を１０５０℃で２時間仮焼後、水を溶媒としてイット
リア安定化ジルコニアのボールを用いて３時間湿式粉砕
した後、乾燥した。得られたBaTi4O9とNd2O3, Sm2O3, G
d2O3及びTiO2とを出発原料として目的の組成になるよう
に秤量後、水を溶媒としてイットリア安定化ジルコニア
のボールを用いて３時間湿式混合を行った後乾燥した。
得られた混合粉体を１２００℃で２時間仮焼後、水を溶
媒としてイットリア安定化ジルコニアのボールを用いて
３時間湿式粉砕した後乾燥し、主成分を得た。The main component of the porcelain composition according to the present invention was prepared as follows. BaTi4O9 is, BaCO 3 and TiO 2
Was used as a starting material, weighed so as to obtain a desired composition, wet-mixed for 3 hours using yttria-stabilized zirconia balls using water as a solvent, and then dried. The obtained mixed powder was calcined at 1050 ° C. for 2 hours, wet-pulverized for 3 hours using yttria-stabilized zirconia balls using water as a solvent, and then dried. The obtained BaTi4O9 and Nd2O3, Sm2O3, G
After d2O3 and TiO2 were used as starting materials and weighed so as to obtain a desired composition, wet mixing was performed for 3 hours using yttria-stabilized zirconia balls using water as a solvent, followed by drying.
The obtained mixed powder was calcined at 1200 ° C. for 2 hours, wet-pulverized for 3 hours using yttria-stabilized zirconia balls using water as a solvent, and dried to obtain a main component.
【００１３】本願発明に係る磁器組成物の副成分は、以
下のようにして前記主成分に加えられた。Bi2O3, B2O3,
ZnO, Li2CO3, GeO2, BaCO3, Al2O3及びNa2CO3は、磁器
組成物の前記主成分に添加量を変化させて加え、水を溶
媒としてイットリア安定化ジルコニアのボールを用いて
２０時間湿式混合を行った。The accessory component of the porcelain composition according to the present invention was added to the main component as follows. Bi2O3, B2O3,
ZnO, Li2CO3, GeO2, BaCO3, Al2O3 and Na2CO3 were added to the above main component of the porcelain composition in varying amounts, and wet-mixed for 20 hours using yttria-stabilized zirconia balls using water as a solvent.
【００１４】このようにして得られた混合粉体に有機物
バインダーとしてＰＶＡを加えて造粒した。このように
して調製された粉体を用い、プレス成形機にて、面圧３
ｔｏｎ／ｃｍ２で１６．５ｍｍΦ、厚さ０．７ｍｍのサ
イズのディスク状サンプルを一軸加圧成形後、９５０〜
１０００℃で２時間空気中焼結を行った。焼成後、セラ
ミックス焼結体の両面に銀ペーストを塗布し、大気中に
おいて７５０℃で焼き付け、外部電極を形成した。The mixed powder thus obtained was granulated by adding PVA as an organic binder. Using the powder thus prepared, a press molding machine was used to apply a surface pressure of 3
After a uniaxial pressure molding of a disk-shaped sample having a size of 16.5 mmΦ and a thickness of 0.7 mm at ton / cm 2,
Sintering was performed in air at 1000 ° C. for 2 hours. After firing, a silver paste was applied to both surfaces of the ceramic sintered body and baked at 750 ° C. in the air to form external electrodes.
【００１５】これら得られた焼結体の単板型コンデンサ
のサンプルについて比誘電率（εr）、Ｑ値を１ＭＨ
ｚ、１Ｖｒｍｓの条件で自動ブリッジ式測定器を用いて
測定した。また、静電容量の温度依存性（ＴＣ）(ppm/
℃)は、＋２５℃における静電容量を基準として、−５
５〜＋１２５℃での静電容量の温度依存性を求めた。こ
の表１は、このようにして得られた焼結体の単板型コン
デンサの特性を表したものである。The relative permittivity (εr) and the Q value of the thus obtained sintered compact single-plate type capacitor samples were 1 MH.
The measurement was performed using an automatic bridge type measuring instrument under the conditions of z and 1 Vrms. In addition, temperature dependence of capacitance (TC) (ppm /
° C) is -5 with respect to the capacitance at + 25 ° C.
The temperature dependence of the capacitance at 5 to + 125 ° C was determined. Table 1 shows the characteristics of the sintered single-plate capacitor thus obtained.
【表１】 [Table 1]
【００１６】主成分のBaTi4O9は、５１．７重量％より
多く６５．６重量％以下の範囲内にあることが好まし
い。６５．６重量％より多いと,例えば試料２５のよう
に、静電容量の温度依存性がＮＰＯ特性を満足しなくな
り電気的特性に悪影響を与える。５１．７重量％以下だ
と、例えば試料２４のように、静電容量の温度依存性が
同様にＮＰＯ特性を満足しなくなる。Preferably, the main component BaTi4O9 is in the range of more than 51.7% by weight and 65.6% by weight or less. If the amount is more than 65.6% by weight, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of the sample 25, and adversely affects the electric characteristics. When the content is 51.7% by weight or less, the temperature dependence of the capacitance similarly does not satisfy the NPO characteristic like the sample 24, for example.
【００１７】主成分のNd2O3は、１０．５重量％より多
く３８．１重量％以下の範囲内にあることが好ましい。
３８．１重量％より多いと所望の電気的特性を得るため
に１１５０℃以上と高温で２時間以上の焼結が必要とな
るからである。１０．５重量％以下だと、例えば試料２
４及び２５のように、静電容量の温度依存性が同様にＮ
ＰＯ特性を満足しなくなる。さらに、主成分のNd2O3
は、２４重量％以上３２重量％以下の範囲内にあること
が好ましい。この範囲内だとさらに焼結温度が低く、電
気的特性が良好となるからである。Preferably, the main component Nd2O3 is in the range of more than 10.5% by weight and 38.1% by weight or less.
If the amount is more than 38.1% by weight, sintering at a high temperature of 1150 ° C. or more and at a high temperature for 2 hours or more is required to obtain desired electric characteristics. If it is 10.5% by weight or less, for example, sample 2
4 and 25, the temperature dependence of the capacitance is similarly N
PO characteristics will not be satisfied. Furthermore, the main component Nd2O3
Is preferably in the range of 24% by weight or more and 32% by weight or less. This is because within this range, the sintering temperature is further lowered, and the electrical characteristics are improved.
【００１８】主成分のSm2O3は、１３．７重量％以下が
好ましい。１３．７重量％より多いと静電容量の温度依
存性がＮＰＯ特性を満足しなくなり、所望の電気的特性
を得るために１１００℃以上と高温で２時間以上の焼結
が必要となるからである。さらに、主成分のSm2O3は、
８重量％以上１２重量％以下の範囲内にあることが好ま
しい。この範囲内だとさらに焼結温度が低く、電気的特
性が良好となるからである。The main component Sm2O3 is preferably 13.7% by weight or less. If the content is more than 13.7% by weight, the temperature dependency of the capacitance does not satisfy the NPO characteristics, and sintering at a high temperature of 1100 ° C. or more and at a high temperature of 2 hours or more is required to obtain desired electric characteristics. is there. Furthermore, the main component Sm2O3 is
It is preferably in the range of 8% by weight or more and 12% by weight or less. This is because within this range, the sintering temperature is further lowered, and the electrical characteristics are improved.
【００１９】主成分のGd2O3は、０．２重量％以下が好
ましい。０．２重量％より多いと静電容量の温度依存性
がＮＰＯ特性を満足しなくなり、比誘電率及びＱ値が低
下し電気的特性に悪影響を与えるからである。The main component Gd2O3 is preferably 0.2% by weight or less. If the content is more than 0.2% by weight, the temperature dependency of the capacitance does not satisfy the NPO characteristic, the relative dielectric constant and the Q value decrease, and the electrical characteristics are adversely affected.
【００２０】主成分のTiO2は、2.6重量％以下が好まし
い。２．６重量％より多いと、例えば試料２４及び２５
のように静電容量の温度依存性がＮＰＯ特性を満足しな
くなるからである。The content of TiO2 as a main component is preferably 2.6% by weight or less. If it is more than 2.6% by weight, for example, samples 24 and 25
This is because the temperature dependency of the capacitance does not satisfy the NPO characteristics as in the above.
【００２１】添加物のBi2O3は、４．０重量％より多く
１０．３重量％以下の範囲内にあることが好ましい。１
０．３重量％より多いと,例えば試料１のように、静電
容量の温度依存性がＮＰＯ特性を満足しなくなりＱ値が
低下し電気的特性に悪影響を与える。４．０重量％以下
だと、例えば試料２２，２４及び２５のように、静電容
量の温度依存性が同様にＮＰＯ特性を満足しなくなる。The additive Bi2O3 is preferably in the range of more than 4.0% by weight and not more than 10.3% by weight. 1
If the content is more than 0.3% by weight, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of Sample 1, for example, and the Q value is reduced, which adversely affects the electrical characteristics. If the content is less than 4.0% by weight, the temperature dependence of the capacitance similarly does not satisfy the NPO characteristics like the samples 22, 24 and 25.
【００２２】添加物のB2O3は、０．５重量％以上３．０
重量％より少ない範囲内にあることが好ましい。３．０
重量％以上だと,例えば試料１のように、静電容量の温
度依存性がＮＰＯ特性を満足しなくなりＱ値が低下し電
気的特性に悪影響を与える。０．５重量％より少ない
と、例えば試料２１及び２４のように、静電容量の温度
依存性が同様にＮＰＯ特性を満足しなくなり比誘電率が
低下し電気的特性に悪影響を与える。さらに、添加物の
B2O3は、０．５重量％以上０．７重量％以下の範囲内に
あることが好ましい。この範囲内だとさらに焼結温度が
低く、電気的特性が良好となるからである。The additive B2O3 is 0.5% by weight or more and 3.0% by weight.
Preferably, it is in the range of less than wt%. 3.0
If it is not less than% by weight, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of the sample 1, for example, and the Q value is reduced, which adversely affects the electric characteristics. If the amount is less than 0.5% by weight, the temperature dependence of the capacitance similarly does not satisfy the NPO characteristic as in the case of Samples 21 and 24, and the relative dielectric constant is lowered, which adversely affects the electric characteristics. In addition,
B2O3 is preferably in the range of 0.5% by weight or more and 0.7% by weight or less. This is because within this range, the sintering temperature is further lowered, and the electrical characteristics are improved.
【００２３】添加物のZnOは、０．３重量％より多く
０．７重量％以下の範囲内にあることが好ましい。０．
７重量％より多いと,例えば試料１のように、静電容量
の温度依存性がＮＰＯ特性を満足しなくなりＱ値が低下
し電気的特性に悪影響を与える。所望の電気的特性を得
るために１１００℃以上と高温で２時間以上の焼結が必
要となるからである。０．３重量％以下だと、例えば試
料１７及び２４のように、静電容量の温度依存性が同様
にＮＰＯ特性を満足しなくなる。It is preferable that the additive ZnO is in the range of more than 0.3% by weight and 0.7% by weight or less. 0.
If the content is more than 7% by weight, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of the sample 1, for example, and the Q value is reduced, which adversely affects the electrical characteristics. This is because sintering at a high temperature of 1100 ° C. or more and at a high temperature for 2 hours or more is required to obtain desired electric characteristics. If the content is 0.3% by weight or less, the temperature dependence of the capacitance similarly does not satisfy the NPO characteristics like the samples 17 and 24.
【００２４】添加物のLi2CO3は、０．６重量％より少な
いことが好ましい。０．６重量％より多いと,例えば試
料４，５及び６のように、静電容量の温度依存性がＮＰ
Ｏ特性を満足しなくなり比誘電率が低下し電気的特性に
悪影響を与えるからである。Preferably, the additive Li2CO3 is less than 0.6% by weight. If the content is more than 0.6% by weight, the temperature dependence of the capacitance becomes NP, as in Samples 4, 5 and 6, for example.
This is because the O characteristics are no longer satisfied, the relative dielectric constant is reduced, and the electrical characteristics are adversely affected.
【００２５】添加物のGeO2は、０．１重量％以上５．０
重量％より少ない範囲内にあることが好ましい。５．０
重量％以上だと,例えば試料１９のように、静電容量の
温度依存性がＮＰＯ特性を満足しなくなる。０．１重量
％より少ないと、例えば試料１、２４及び２５のよう
に、静電容量の温度依存性が同様にＮＰＯ特性を満足し
なくなりＱ値が低下し電気的特性に悪影響を与える。所
望の電気的特性を得るために１１００℃以上の温度で２
時間以上の焼結が必要となるからである。さらに、添加
物のGeO2は、２．０重量％以上４．０重量％以下の範囲
内にあることが好ましい。この範囲内だとさらに焼結温
度が低く、電気的特性が良好となるからである。The additive GeO 2 is 0.1% by weight or more and 5.0% or more.
Preferably, it is in the range of less than wt%. 5.0
If the content is more than the weight%, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of the sample 19, for example. If the amount is less than 0.1% by weight, the temperature dependence of the capacitance similarly does not satisfy the NPO characteristic as in the case of Samples 1, 24 and 25, and the Q value is reduced, which adversely affects the electric characteristics. In order to obtain the desired electrical characteristics,
This is because sintering for more than an hour is required. Further, GeO2 of the additive is preferably in the range of 2.0% by weight or more and 4.0% by weight or less. This is because within this range, the sintering temperature is further lowered, and the electrical characteristics are improved.
【００２６】添加物のBaCO3は、３．８重量％より少な
いことが好ましい。３．８重量％以上だと,例えば試料
２０のように、静電容量の温度依存性がＮＰＯ特性を満
足しなくなり比誘電率が低下し電気的特性に悪影響を与
えるからである。Preferably, the BaCO3 additive is less than 3.8% by weight. If the content is 3.8% by weight or more, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of the sample 20, for example, and the relative dielectric constant decreases, which adversely affects the electrical characteristics.
【００２７】添加物のAl2O3は、1.2重量％より少ないこ
とが好ましい。１．２重量％以上だと,例えば試料１の
ように、静電容量の温度依存性がＮＰＯ特性を満足しな
くなりＱ値が低下し電気的特性に悪影響を与えるからで
ある。Preferably, the additive Al2O3 is less than 1.2% by weight. If the content is 1.2% by weight or more, the temperature dependence of the capacitance does not satisfy the NPO characteristic as in the case of the sample 1, for example, and the Q value is reduced, which adversely affects the electrical characteristics.
【００２８】添加物のNa2CO3は、0.7重量％より少ない
ことが好ましい。０．７重量％以上だと,例えば試料１
のように、静電容量の温度依存性がＮＰＯ特性を満足し
なくなりＱ値が低下し電気的特性に悪影響を与えるから
である。Preferably, the additive Na2CO3 is less than 0.7% by weight. If it is 0.7% by weight or more, for example, sample 1
This is because the temperature dependence of the capacitance does not satisfy the NPO characteristics as described above, and the Q value is reduced, which adversely affects the electric characteristics.
【００２９】本発明の他の好ましい実施例は、積層セラ
ミックコンデンサに用いられる誘電体磁器組成物であ
る。Another preferred embodiment of the present invention is a dielectric ceramic composition used for a multilayer ceramic capacitor.
【００３０】上述のやり方と同様にして、本願発明に係
る磁器組成物の主成分を得た。この主成分に、Bi2O3, B
2O3, ZnO, Li2CO3, GeO2, BaCO3, Al2O3及びNa2CO3を添
加量を変化させて加え、水を溶媒としてイットリア安定
化ジルコニアのボールを用いて２０時間湿式混合を行っ
た。この得られた混合粉体に有機物バインダーを加え、
湿式混合してセラミック・スリップを調整した。このセ
ラミック・スリップをドクターブレード法によってシー
ト成形し、厚さ２１μｍの矩形のグリーンシートを得
た。次に、このセラミック・グリーンシート上にPdとAg
との混合物である導電ペーストを印刷し内部電極を形成
した。これら内部電極が形成された前記セラミック・グ
リーンシートを、導電ペースト層が引き出されている側
が互い違いになるように複数枚積層して積層体を得た。
上記積層体を空気中において９５０〜１０００℃で２時
間焼成した。焼成後、セラミックス焼結体の両側面に銀
ペーストを塗布し、大気中において７５０℃で焼き付
け、内部電極と電気的に接続された外部電極を形成し
た。In the same manner as described above, the main component of the porcelain composition according to the present invention was obtained. The main components are Bi2O3, B
2O3, ZnO, Li2CO3, GeO2, BaCO3, Al2O3 and Na2CO3 were added in varying amounts, and wet mixing was performed for 20 hours using a ball of yttria-stabilized zirconia using water as a solvent. An organic binder is added to the obtained mixed powder,
The ceramic slip was adjusted by wet mixing. The ceramic slip was formed into a sheet by a doctor blade method to obtain a rectangular green sheet having a thickness of 21 μm. Next, Pd and Ag are placed on this ceramic green sheet.
A conductive paste, which is a mixture of the above, was printed to form internal electrodes. A plurality of the ceramic green sheets on which the internal electrodes were formed were stacked such that the sides from which the conductive paste layers were drawn out were alternated to obtain a stacked body.
The laminate was fired in air at 950 to 1000 ° C. for 2 hours. After firing, silver paste was applied to both sides of the ceramic sintered body and baked at 750 ° C. in the air to form external electrodes electrically connected to the internal electrodes.
【００３１】上述のようにして得られた積層セラミック
コンデンサの外形寸法は、幅３．２ｍｍ、長さ１．６ｍ
ｍ、厚さ０．５ｍｍであった。また、上記内部電極間に
介在する各誘電体セラミック層の厚さは１０μｍであ
り、有効誘電体セラミック層の総数は５であった。この
ようにして得られた誘電体磁器組成物の特性は、焼結温
度が９５０〜１０００℃で２時間の焼結でよく、比誘電
率が７０以上でＱ値が１０００以上であって静電容量の
温度変化率が３０ｐｐｍ／℃以下であった。The external dimensions of the multilayer ceramic capacitor obtained as described above are 3.2 mm in width and 1.6 m in length.
m and thickness 0.5 mm. The thickness of each dielectric ceramic layer interposed between the internal electrodes was 10 μm, and the total number of effective dielectric ceramic layers was 5. The characteristics of the dielectric ceramic composition thus obtained may be sintering at a sintering temperature of 950 to 1000 ° C. for 2 hours, a dielectric constant of 70 or more, a Q value of 1000 or more, and an electrostatic property. The temperature change rate of the capacity was 30 ppm / ° C. or less.
【００３２】上述した実施例では、誘電体磁器組成物の
主成分の１つとしてBaTi4O9を用いたが、BaTi4O9の代わ
りに、BaO及びTiO2を用いてもよい。BaO及びTiO2を用い
る場合、BaOは１６．８重量％以上で２１．３重量％以
下の範囲内にあることが好ましい。またTiO2は３４．９
重量％以上で４６．９重量％以下の範囲内にあることが
好ましい。[0032] In the embodiment described above, was used BaTi4O9 as one of the main component of the dielectric ceramic composition, instead of BaTi4O9, may be used BaO and TiO 2. When BaO and TiO 2 are used, the content of BaO is preferably in the range of 16.8% by weight or more and 21.3% by weight or less. TiO 2 is 34.9
It is preferably in the range of not less than 4% by weight and not more than 46.9% by weight.
【００３３】以上、説明したように本発明は、静電容量
の温度変化率がＮＰＯ特性を満足し、且つ比誘電率が６
０以上と電気的特性の良好な積層セラミックコンデンサ
を９５０℃〜１０００℃の低い焼結温度で作成すること
ができた。As described above, according to the present invention, the temperature change rate of the capacitance satisfies the NPO characteristic and the relative dielectric constant is 6
A multilayer ceramic capacitor having good electrical characteristics of 0 or more could be manufactured at a low sintering temperature of 950 ° C. to 1000 ° C.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｇ 4/12 ３５８ Ｈ０１Ｇ 4/12 ３５８ ４１５ ４１５ // Ｈ０１Ｐ 7/00 Ｈ０１Ｐ 7/00 Ｚ Ｆターム(参考） 4G031 AA06 AA11 AA26 AA29 AA35 AA36 AA40 BA09 5E001 AB01 AB03 AC09 AC10 AE00 AE02 AE03 AE04 AF06 AH05 AH08 AH09 AJ02 5G303 AA02 AA10 AB06 AB08 AB11 AB15 AB20 BA12 CA01 CB01 CB02 CB03 CB05 CB16 CB20 CB22 CB35 CB38 CB41 CB42 5J006 HC07 HD00 HD11 LA01 LA14 LA25 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H01G 4/12 358 H01G 4/12 358 415 415 // H01P 7/00 H01P 7/00 Z F term (reference 4G031 AA06 AA11 AA26 AA29 AA35 AA36 AA40 BA09 5E001 AB01 AB03 AC09 AC10 AE00 AE02 AE03 AE04 AF06 AH05 AH08 AH09 AJ02 5G303 AA02 AA10 AB06 AB08 AB11 AB15 AB20 BA12 CA01 CB01 CB02 CB01 CB01 CB01 CB01 CB01 CB02 CB01 CB01 CB02 CB01 LA14 LA25
Claims (2)
3, TiO2から構成され、副成分としてBi2O3, B2O3, ZnO,
Li2CO3, GeO2, BaCO3, Al2O3, Na2CO3を含む誘電体磁
器組成物であって、前記主成分を組成式aBaTi4O9-bNd2O
3-cSm2O3-dGd2O3-eTiO2で示すと、a+b+c+d+e=100重量％
として、それぞれの含有量が、65.6≧a>51.7, 38.1≧b>
10.5, 13.7≧c≧0.0, 0.2≧d≧0.0, 2.6≧e≧0.0であ
り、一方前記副成分を組成式fBi2O3-gB2O3-hZnO-iLi2CO
3-jGeO2-kBaCO3-lAl2O3-mNa2CO3で示すと、前記主成分
に対してそれぞれの添加重量％が、10.3≧f>4.0, 3.0>g
≧0.5, 0.7≧h>0.3, 0.6>i≧0.0, 5.0>j≧0.1, 3.8>k≧
0.0, 1.2>l≧0.0, 0.7>m≧0.0であることを特徴とする
誘電体磁器組成物。The main component is BaTi4O9, Nd2O3, Sm2O3, Gd2O
3, composed of TiO2, with Bi2O3, B2O3, ZnO,
Li2CO3, GeO2, BaCO3, Al2O3, a dielectric porcelain composition comprising Na2CO3, wherein the main component is a composition formula aBaTi4O9-bNd2O
In terms of 3-cSm2O3-dGd2O3-eTiO2, a + b + c + d + e = 100% by weight
As each content, 65.6 ≧ a> 51.7, 38.1 ≧ b>
10.5, 13.7 ≧ c ≧ 0.0, 0.2 ≧ d ≧ 0.0, 2.6 ≧ e ≧ 0.0, while the sub-component is represented by the composition formula fBi2O3-gB2O3-hZnO-iLi2CO
In terms of 3-jGeO2-kBaCO3-lAl2O3-mNa2CO3, the weight percent of each of the main components is 10.3≥f> 4.0, 3.0> g
≧ 0.5, 0.7 ≧ h> 0.3, 0.6> i ≧ 0.0, 5.0> j ≧ 0.1, 3.8> k ≧
A dielectric porcelain composition, wherein 0.0, 1.2> l ≧ 0.0, 0.7> m ≧ 0.0.
O2から構成され、副成分としてBi2O3, B2O3, ZnO, Li2C
O3, GeO2, BaCO3, Al2O3, Na2CO3を含む誘電体磁器組成
物であって、前記主成分を組成式aBaO-bNd2O3-cSm2O3-d
Gd2O3-eTiO2で示すと、a+b+c+d+e=100重量％として、そ
れぞれの含有量が、21.3≧a≧16.8,38.1≧b>10.5, 13.7
≧c≧0.0, 0.2≧d≧0.0, 46.9≧e≧34.9であり、一方前
記副成分を組成式fBi2O3-gB2O3-hZnO-iLi2CO3-jGeO2-kB
aCO3-lAl2O3-mNa2CO3で示すと、前記主成分に対してそ
れぞれの添加重量％が、10.3≧f>4.0, 3.0>g≧0.5, 0.7
≧h>0.3, 0.6>i≧0.0, 5.0>j≧0.1, 3.8>k≧0.0, 1.2>l
≧0.0, 0.7>m≧0.0であることを特徴とする誘電体磁器
組成物。2. The main component is BaO, Nd2O3, Sm2O3, Gd2O3, Ti
O2, Bi2O3, B2O3, ZnO, Li2C
O3, GeO2, BaCO3, Al2O3, a dielectric porcelain composition containing Na2CO3, wherein the main component is a composition formula aBaO-bNd2O3-cSm2O3-d
In terms of Gd2O3-eTiO2, assuming that a + b + c + d + e = 100% by weight, the respective contents are 21.3 ≧ a ≧ 16.8, 38.1 ≧ b> 10.5, 13.7
≧ c ≧ 0.0, 0.2 ≧ d ≧ 0.0, 46.9 ≧ e ≧ 34.9, while the sub-component has the composition formula fBi2O3-gB2O3-hZnO-iLi2CO3-jGeO2-kB
In the case of aCO3-lAl2O3-mNa2CO3, the weight percent of each of the main components is 10.3 ≧ f> 4.0, 3.0> g ≧ 0.5, 0.7
≧ h> 0.3, 0.6> i ≧ 0.0, 5.0> j ≧ 0.1, 3.8> k ≧ 0.0, 1.2> l
≧ 0.0, 0.7> m ≧ 0.0, wherein the dielectric porcelain composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11119134A JP2000313660A (en) | 1999-04-27 | 1999-04-27 | Dielectric ceramic composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11119134A JP2000313660A (en) | 1999-04-27 | 1999-04-27 | Dielectric ceramic composition |
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| Publication Number | Publication Date |
|---|---|
| JP2000313660A true JP2000313660A (en) | 2000-11-14 |
Family
ID=14753787
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006109465A1 (en) * | 2005-03-31 | 2006-10-19 | Matsushita Electric Industrial Co., Ltd. | Dielectric porcelain composition and high frequency device using the same |
| CN105819850A (en) * | 2016-03-18 | 2016-08-03 | 武汉理工大学 | Y8-R type capacitor ceramic dielectric material and preparation method thereof |
-
1999
- 1999-04-27 JP JP11119134A patent/JP2000313660A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006109465A1 (en) * | 2005-03-31 | 2006-10-19 | Matsushita Electric Industrial Co., Ltd. | Dielectric porcelain composition and high frequency device using the same |
| US7592886B2 (en) | 2005-03-31 | 2009-09-22 | Panasonic Corporation | Dielectric porcelain composition and high frequency device using the same |
| CN105819850A (en) * | 2016-03-18 | 2016-08-03 | 武汉理工大学 | Y8-R type capacitor ceramic dielectric material and preparation method thereof |
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