KR970008751B1 - Microwave dielectric ceramics - Google Patents
Microwave dielectric ceramics Download PDFInfo
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- KR970008751B1 KR970008751B1 KR1019940030097A KR19940030097A KR970008751B1 KR 970008751 B1 KR970008751 B1 KR 970008751B1 KR 1019940030097 A KR1019940030097 A KR 1019940030097A KR 19940030097 A KR19940030097 A KR 19940030097A KR 970008751 B1 KR970008751 B1 KR 970008751B1
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- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
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- C04B35/465—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates
- C04B35/468—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
- C04B35/462—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates
- C04B35/472—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on lead titanates
Abstract
Description
[발명의 명칭][Name of invention]
마이크로웨이브용 유전체 세라믹 조성물Dielectric Ceramic Composition for Microwave
[발명의 상세한 설명]Detailed description of the invention
[발명의 분야][Field of Invention]
본 발명은 민생용 및 산업용 전자기기에 사용되는 마이크로 웨이브 대역 부품용 소재 및 적층 세라믹 커패시터와 전자파 장해(Electro-Magnetic Interference : EMI)필터의 온도보상용 소재로서 유용한 세라믹 조성물에 관한 것으로서, 특히 유전율이 높고 공진주파수의 온도계수가 낮으며, 품질계수(Quality factor : Q)가 양호한 세라믹(Caramic)유전체 조성물에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic composition useful as a material for microwave band components and multilayer ceramic capacitors and electromagnetic interference (Electro-Magnetic Interference) EMI filters used in consumer and industrial electronics. The present invention relates to a ceramic dielectric composition having a high, low resonant frequency, and good quality factor (Q).
[종래의 기술][Prior art]
최근 자동차 전화, 휴대 전화, 코드리스 전화, 위성방송 수신기등의 통신수단이 범용화 됨에 따라 마이크로웨이브용 회로, 집적회로의 발전 등으로 마이크로웨이브 대역용 필터, 기판 및 전압조절 진동자(Voltage Controlled Oscillator : VCO)용 유전체 세라믹이 널리 이용되고 있다.As communication means such as automobile telephone, cellular phone, cordless telephone and satellite broadcasting receiver are widely used in recent years, microwave band filters, substrates, and voltage controlled oscillators (Voltage Controlled Oscillators) have been developed due to the development of microwave circuits and integrated circuits. Dielectric ceramics are widely used.
이러한 마이크로웨이브 유전체 세라믹은 주로 공진기(Resonator)로 이용되고 있는데, 여기에 사용되는 세라믹 조성물로는 BaO-Nd2O3-TiO2, BaO-Sm2O3-TiO2PbO-ZrO2-CaO 등 다양한 유전체가 이용되고 있다.The microwave dielectric ceramic is mainly used as a resonator, and the ceramic composition used herein includes BaO-Nd 2 O 3 -TiO 2 , BaO-Sm 2 O 3 -TiO 2 PbO-ZrO 2 -CaO, and the like. Various dielectrics are used.
이중, BaO-Nd2O3-TiO2와 BaO-Sm2O3-TiO2세라믹은 유전율이 60-80 정도이고 품질계수가 1GHz에서 5000정도이며, 공진주파수의 온도계수(τf)의 변화가 매우 커서 실용상 큰 문제가 있다.Among them, BaO-Nd 2 O 3 -TiO 2 and BaO-Sm 2 O 3 -TiO 2 ceramics have a dielectric constant of about 60-80, a quality factor of about 5000 at 1GHz, and a change in the temperature coefficient (τ f ) of the resonance frequency. It is very large and there is a big problem in practical use.
그리고 일본에서 제안된 PbO-ZrO2-CaO계는 유전율이 90 이상으로 높은 반면, 고주파에서 품질계수가 1000에서 3500정도로 낮고 3GHz이상의 고주파에서는 손실이 높아서 대역통과필터(Band Pass Filter : BPF) 및 전압조절 진동자 등의 부품손실을 높이는 단점이 있다.In addition, the PbO-ZrO 2 -CaO system proposed in Japan has a high dielectric constant of more than 90, whereas the quality factor at high frequency is low from 1000 to 3500, and the loss is high at 3GHz or higher, so the band pass filter (BPF) and voltage There is a disadvantage in that the parts loss such as the adjustable oscillator is increased.
이러한 부품에 적용되기 위한 요구특성으로서는 품질계수가 높아야 하며(예를 들어, 1GHz에서 5000이상), 공진주파수의 온도안정성이 작아야 한다.The required characteristics to be applied to these parts should be high quality factors (eg 5000 or more at 1 GHz) and low temperature stability of the resonant frequency.
품질계수가 개선된 세라믹 조성물로서, 일본에서 PbO의 첨가로 인한 유전율의 향상을 보고한 BaO-Pbo-Nd2O3-TiO2조성물이 제안된 바 있다. 이 계의 유전율은 88, 품질계수가 4000~5500 저도로 보고되어 있다. 그러나, 이 계는 PbO가 첨가됨으로써 유전율은 증가되나, 조성비가 0.5BaO-0.5PbO-1.0Nd2O3-5TiO2로 산화납의 조성비가 높으며, 또한 제조공정상 산화납 및 산화비스무스를 과량으로 첨가하게 되는데, 이들 첨가원소의 휘발로 인하여 균일한 조성제어가 어려우며, 이들 첨가제는 제조공정상 인체에 매우 유해한 원소로 알려져 있고, 값비싼 산화니오디움이 필수적으로 사용되는 유전체이다.As a ceramic composition having an improved quality factor, a BaO-Pbo-Nd 2 O 3 -TiO 2 composition has been proposed in Japan, which reported an improvement in permittivity due to the addition of PbO. The dielectric constant of this system is 88, and the quality factor is reported as low as 4000 ~ 5500. However, PbO is added to increase the dielectric constant, but the composition ratio is 0.5BaO-0.5PbO-1.0Nd 2 O 3 -5TiO 2 , which has a high composition ratio of lead oxide. Due to the volatilization of these additive elements, uniform composition control is difficult, and these additives are known as very harmful elements to the human body in the manufacturing process, and expensive dielectric materials are essential dielectrics.
[본 발명에서 해결하고자 하는 문제점][Problem to solve in the present invention]
마이크로웨이브용 부품에 사용하기 위해서 요구되는 조건은 고주파에서 유전체의 유전율이 커야하고 품질계수도 5000이상 되어야 하며, 공진주파수의 온도계수가 ±5ppp/℃로 낮아야 한다.The conditions required for use in microwave components are that the dielectric constant of the dielectric should be high at high frequencies, the quality factor should be more than 5000, and the temperature coefficient of the resonance frequency should be as low as ± 5 ppp / ℃.
이들 유전특성을 만족하는 것 이외에 제조공정에서 요구도는 조건은 성분원소의 휘발로 조성의 제어가 어려운 단점을 방지함으로써 품질저하를 방지하고, 제조공정상 인체에 유해한 원소인 납성분 및 비스무스 성분원소들의 양을 줄임으로써 제조공정 성분을 안정적으로 제어하는데 있다.In addition to satisfying these dielectric properties, the requirements of the manufacturing process prevent quality deterioration by preventing the disadvantages of control of the composition due to volatilization of the component elements, and the amount of lead and bismuth component elements that are harmful to the human body in the manufacturing process. It is to stably control the manufacturing process components by reducing the
[발명의 목적][Purpose of invention]
본 발명은 상술한 조건들을 감안하여 안출된 것으로서, 그 목적은 종래 유전체에 비해 제조원소의 조성비가 안정화되고 낮은 제조원가로 제조가능하며, 고주파에서 유전율이 크고 품질계수가 높은 마이크로웨이브 유전체 세라믹 조성물을 제공하는데 있다.The present invention has been made in view of the above-described conditions, and an object thereof is to provide a microwave dielectric ceramic composition having a high dielectric constant and high quality factor at a high frequency, which can be manufactured at a low manufacturing cost with a stable composition ratio of a manufacturing element compared to a conventional dielectric. It is.
[발명의 구성][Configuration of Invention]
본 발명은 산화바륨, 산화납, 산화사마륨, 산화란탄, 산화세륨 및 이산화티탄을 주성분으로 하는 유전체 세라믹 조성물로서, 여러차례의 실험을 통해서 다음과 같은 새로운 조성을 얻었다.The present invention is a dielectric ceramic composition composed mainly of barium oxide, lead oxide, samarium oxide, lanthanum oxide, cerium oxide, and titanium dioxide, and through several experiments, the following new composition is obtained.
예를들어, 본 발명은 제1성분으로 6~20mol%의 BaO1-a·PbOa, 제 2 성분으로 6~20mol%의 (Sm(1-β-γ)·LaβCeγ)2O3, 제 3 성분으로 60~75mol%의 zTiO2로 구성된다.For example, the present invention provides 6-20 mol% of BaO 1- aPbO a as the first component and 6-20 mol% of (Sm (1-β-γ) La β Ce γ ) 2 O as the second component. 3 , the third component is composed of 60 to 75 mol% zTiO 2 .
본 발명은 산화니오디움보다 가격이 저렴한 산화사마륨을 사용하여 유전율은 같고 품질계수가 증가한 조성을 얻을 수 있고, 상기 산화사마륨과 같은 회토류 원소인 산화란탄 및 산화세륨 등을 치환함으로써, 유전을 및 품질계수의 향상과 공진주파수 온도겨수의 안정화를 얻을 수 있다.According to the present invention, samarium oxide, which is cheaper than niobium oxide, can be used to obtain a composition having the same dielectric constant and increased quality coefficient, and by replacing rare earth elements such as samarium oxide such as lanthanum oxide and cerium oxide, It is possible to improve the coefficient and stabilize the resonance frequency temperature.
특히, 산화세륨의 첨가는 소결조제로서의 역활을 수행하여 소결온도를 낮추어 줄 수 있다.In particular, the addition of cerium oxide may serve as a sintering aid to lower the sintering temperature.
이외에 3몰% 내외의 산화납을 사용함으로써 납성분의 휘발로 인한 품질계수의 저하를 방지할 수 있고 조성의 조절이 용이하다.In addition, by using the lead oxide of about 3 mol% can prevent the degradation of the quality factor due to the volatilization of the lead component and easy to control the composition.
상기 조성물을 1225℃~1450℃ 범위의 소결온도에서 소결하여 제조된 본 발명의 유전체 세라믹은 90이상의 유전율과, ±5ppm/℃이내의 공진주파수 온도계수를 얻을 수 있고, 1GHz 공진주파수에서 7000이상의 품질계수를 갖는다.The dielectric ceramic of the present invention prepared by sintering the composition at a sintering temperature in the range of 1225 ° C to 1450 ° C has a dielectric constant of 90 or more and a resonant frequency temperature coefficient within ± 5 ppm / ° C, and a quality of 7000 or more at 1 GHz resonant frequency. Has a coefficient.
[실시예]EXAMPLE
이하, 본 발명의 바람직한 실시예를 설명한다.Hereinafter, preferred embodiments of the present invention will be described.
산화바륨, 산화납, 산화사마륨, 산화란탄, 산화세륨 및 이산화티탄의 각 성분들을 소정의 조성비로 평량하여 탈이온수와 함께 혼합한다.Each component of barium oxide, lead oxide, samarium oxide, lanthanum oxide, cerium oxide and titanium dioxide is weighed in a predetermined composition ratio and mixed with deionized water.
본 발명의 유전체 세라믹 조성물의 조성식은 다음과 같다.The composition formula of the dielectric ceramic composition of the present invention is as follows.
x(BaO1-α·PbOα)-y(Sm(1-β-γ)·LaβCeγ)2O3-zTiO2 x (BaO 1- αPbO α ) -y (Sm (1-β-γ) La β Ce γ ) 2 O 3 -zTiO 2
각 성분들의 조성비는 하기 표에 요약되어 있다.The composition ratio of each component is summarized in the table below.
표 1은 산화란탄 첨가(γ=0)시의 각 조성 및 제조조건과 그에 따른 유전특성 결과를 요약한 것이다. 표 2는 산화세륨 첨가(β=0)시의 각 조성 및 제조조건과 그에 다른 유전특성 결과를 요약한 것이다.Table 1 summarizes the composition and preparation conditions of the lanthanum oxide addition (γ = 0) and the result of dielectric properties. Table 2 summarizes the composition and manufacturing conditions of the cerium oxide addition (β = 0) and the results of the different dielectric properties.
표 3은 산화란탄과 산화세륨 첨가시의 각 조성 및 제조조건과 그에 따른 유전특성 결과를 요약한 것이다.Table 3 summarizes the composition and manufacturing conditions of the addition of lanthanum oxide and cerium oxide and the result of dielectric properties.
이때, 상기 산화바륨 대신에 탄산바륨(BaCO3)을 산화납(PbO) 대신에 삼산화납(Pb3O4)를 사용할 수도 있다.At this time, barium carbonate (BaCO 3) in place of the barium oxide may be used trioxide, lead (Pb 3 O 4) instead of lead oxide (PbO).
혼합을 볼밀링 방법을 이용하며, 지르코니아볼과 플라스틱 단지를 이용한다.The mixing is done using a ball milling method, using zirconia balls and plastic jars.
건조된 파우더를 1000℃ 이상에서 2시간 동안 하소를 수행하고, 폴리비닐알콜을 적정량 첨가하여 지르코니아유발에서 혼합한다.The dried powder is calcined at 1000 ° C. or higher for 2 hours, and an appropriate amount of polyvinyl alcohol is added and mixed in zirconia induction.
혼합된 재료는 금형과 유압프레스를 사용하여 직경 10mm이상, 높이 5mm이상의 원통형 시편으로 성형한다.The mixed material is molded into cylindrical specimens of 10 mm or more in diameter and 5 mm or more in height by using a mold and hydraulic press.
성형시의 압력은 1.0ton/㎠ 이상이다.The pressure at the time of shaping | molding is 1.0 ton / cm <2> or more.
성형된 시편을 지르코니아 셋터(Setter)위에 높고 공기분위기에서 1200℃ 이상의 고온으로 즉, 표1~표 3에 열거한 소결조건으로 전기로를 이용하여 소결한다.The shaped specimens are sintered using an electric furnace at high temperatures over a zirconia setter and at least 1200 ° C. in an air atmosphere, ie, under the sintering conditions listed in Tables 1 to 3.
[표 1] 산화란탄 첨가시 각 조성 및 제조조건과 그에 따른 유전특성[Table 1] Composition and manufacturing conditions and dielectric properties according to the addition of lanthanum oxide
[표 2] 산화세륨 첨가시 각 조성 및 제조조건과 그에 따른 유전특성[Table 2] Composition and manufacturing conditions and dielectric properties according to the addition of cerium oxide
[표 3] 산화란탄과 산화세륨 첨가시 각 조성 및 제조조건과 그에 따른 유전특성[Table 3] Composition, manufacturing conditions and dielectric properties according to the addition of lanthanum oxide and cerium oxide
소결을 행한 시편은 하키-콜만(Hakki-Coleman)법으로 약 3Ghz에서 유전율을 측정하였고, 개방형 공진기법으로 유전체에 무부하 Q를 측정하였다.The sintered specimens were measured for dielectric constant at about 3 GHz by the Hockey-Coleman method and no-load Q in the dielectric by an open resonant method.
또, 공진주파수의 온도계수는 아래(1)식에 의해 25℃의 온도에 대한 공진주파수를 기준으로 25℃에서 125℃의 온도범위에 대하여 구하였다.The temperature coefficient of the resonance frequency was obtained for the temperature range of 25 ° C to 125 ° C based on the resonance frequency with respect to the temperature of 25 ° C by the following equation (1).
(1) (One)
·f(125) = 125℃에서의 공진주파수F (125) = resonance frequency at 125 ° C
·f(25) = 25℃에서의 공진주파수F (25) = resonance frequency at 25 ° C
·△T=측정온도차이, 이 경우 125-(25)=100ΔT = measurement temperature difference, in this case 125- (25) = 100
이상의 방법으로 제작된 각 세라믹 유전체의 유전특성을 측정한 결과, 조성중 이산화티탄(TiO2)의 첨가량(z)이 증가함에 따라 최적 소결온도는 감소하고 품질계수가 증가하는 효과를 얻을 수 있다.As a result of measuring the dielectric properties of each ceramic dielectric fabricated by the above method, the optimum sintering temperature is decreased and the quality factor is increased as the amount z of titanium dioxide (TiO 2 ) is increased in the composition.
그러나, 이산화티탄이 75몰% 이상일 때는 공진주파수의 온도계수는 양(Positive)으로 이동되어 실용상 어려운 단점이 있다.However, when the titanium dioxide is 75 mol% or more, the temperature coefficient of the resonance frequency is positively moved, which is difficult in practical use.
또한 60몰% 이하이면 화학조성비가 적합하지 않아 유전체가 형성되지 않는다.In addition, if it is 60 mol% or less, a chemical composition ratio is not suitable and a dielectric will not be formed.
따라서, 본 발명의 실시예에서 바람직한 TiO2의 첨가량(z)은 약 60~75몰%임을 알 수 있다.Therefore, it can be seen that the preferred amount of addition (z) of TiO 2 in the embodiment of the present invention is about 60 to 75 mol%.
조성중 산화사마륨의 양이 증가함에 따라 품질계수가 증가하는 효과를 얻을 수 있으나 적정 소결온도가 1400℃이상으로 높아지며, 18몰% 이상일 때 공진주파수의 온도계수가 양으로 이동되는 단점도 있다.As the amount of samarium oxide in the composition increases, the quality factor can be increased, but the optimum sintering temperature is increased to 1400 ° C. or higher, and the temperature coefficient of the resonance frequency is shifted to a positive amount when it is 18 mol% or more.
첨가량이 5몰%이하이면 상대적으로 이산화티탄 첨가량의 증가로 인하여 공진주파수 온도계수가 양으로 이동된다.If the amount is less than 5 mol%, the resonance frequency temperature coefficient is shifted to the positive amount due to the increase in the amount of titanium dioxide added.
따라서, 산화사마륨 성분의 바람직한 조성비는 약 6~20mol%이다.Therefore, the preferable composition ratio of the samarium oxide component is about 6-20 mol%.
산화사마륨 대신에 산화란탄(La2O3)을 첨가하면, 공진주파수의 온도계수가 양의 방향으로 이동하여 온도계수의 조절이 용이하며, 유전율과 품질계수가 증가한다.If lanthanum oxide (La 2 O 3 ) is added instead of samarium oxide, the temperature coefficient of the resonance frequency moves in the positive direction, and thus the temperature coefficient is easily controlled, and the dielectric constant and quality coefficient are increased.
또한, 산화사마륨 대신에 산화세륨(CeO2)을 첨가하면, 공진주파수의 온도계수가 양의 방향으로 이동하여 온도계수의 조절이 용이하며, 유전율과 품질계수가 증가하고 소결온도를 낮추어 준다.In addition, if cerium oxide (CeO 2 ) is added instead of samarium oxide, the temperature coefficient of the resonant frequency moves in the positive direction, and thus the temperature coefficient is easily controlled, and the dielectric constant and quality coefficient are increased and the sintering temperature is lowered.
조성중 산화납의 첨가량이 증가함에 따라 적정소결 온도가 낮아지고 유전율이 증가하는 효과가 있으나, 15몰% 이상 첨가하면, 산화납의 휘발로 인하여 조성조절에 어려움이 있고 품질계수가 저하되는 단점이 있다.As the amount of lead oxide added in the composition increases, the proper sintering temperature is lowered and the dielectric constant is increased. However, when 15 mol% or more is added, it is difficult to control the composition due to volatilization of lead oxide and the quality factor is lowered.
또한, 조성중 산화바륨의 양을 증가시키면 품질계수는 낮아지나, 공진주파수의 온도안정성을 얻을 수 있다.In addition, if the amount of barium oxide in the composition is increased, the quality factor is lowered, but temperature stability of the resonance frequency can be obtained.
또, 상기 조성에서 산화바륨(BaO) 대신에 탄산바륨(BaCO3)을 이용하여도 유전특성에는 큰 변화가 없으나, 산화납(PbO) 대신에 삼산화납(Pb3O4)을 이용하면 균일한 혼합이 이루어지며, 유전특성에는 큰 영향을 미치지 않는다.In addition, even if barium carbonate (BaCO 3 ) is used instead of barium oxide (BaO) in the above composition, there is no significant change in dielectric properties, but if lead trioxide (Pb 3 O 4 ) is used instead of lead oxide (PbO), it is uniform. Mixing takes place and does not significantly affect the dielectric properties.
동일한 조성에서 소결온도가 높아지면 유전율과 품질계수가 약간 높아지고, 소결시간이 길어지면 유전율은 거의 변화가 없으나 품질계수가 약간 높아짐을 알 수 있다.In the same composition, when the sintering temperature is increased, the dielectric constant and quality coefficient are slightly higher, and when the sintering time is longer, the dielectric constant is almost unchanged, but the quality coefficient is slightly higher.
서로 다른 조성비가 소결조건에서 제조된 각 시료의 유전특성결과를 표 1~표 3에 요약하였다.The dielectric properties of each sample prepared under different sintering conditions are summarized in Tables 1 to 3.
[발명의 효과][Effects of the Invention]
이상 설명한 바와 같이 본 발명에 의하면, 낮은 제조원가를 가지며, 휘발성이 적고, 인체에 유해한 성분의 조성비를 안정화된 소결조제를 이용하여 상온에서 90이상의 유전율과 공진주파수 온도계수가 평탄하며 7000이상의 품질계수를 갖는 세라믹 유전체를 얻을 수 있다.As described above, according to the present invention, the sintering aid has a low manufacturing cost, is less volatile, and stabilizes the composition ratio of harmful components to the human body. A ceramic dielectric can be obtained.
이들 유전체는 유전율 및 품질계수가 우수하기 때문에 마이크로웨이브 유전체에 응용가능하며, 공진주파수 온도계수가 ±5ppm/℃ 이내를 갖는 유전체는 EMI필터용 유전체 및 온도보상용 캐패시터로도 널리 이용될 수 있다.These dielectrics can be applied to microwave dielectrics because of their excellent dielectric constant and quality factor, and dielectrics having a resonance frequency temperature of within ± 5 ppm / ° C can be widely used as EMI filter dielectrics and temperature compensation capacitors.
또한, 값비싼 산화니오디움(Nd2O3)이나 산화사마륨 대신에 이보다 휠씬 값이 싼 산화란탄(La2O3)을 첨가함으로써 원소에 자체가 차지하는 가격비중을 낮춤으로써 제조원가를 절감할 수 있다.In addition, by adding lanthanum oxide (La 2 O 3 ), which is much cheaper than that of expensive sodium oxide (Nd 2 O 3 ) or samarium oxide, the manufacturing cost can be reduced by lowering the weight ratio of the element itself. .
또한 산화납 및 산화비스무스의 휘발에 대한 문제점을 줄일 수 있어서 일반 제조공정을 사용할 수 있으며, 인체에 유해한 원소의 사용을 줄일 수 있는 효과를 발휘한다.In addition, the problem of the volatilization of lead oxide and bismuth oxide can be reduced, so that a general manufacturing process can be used, and the use of an element harmful to the human body can be reduced.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019940030097A KR970008751B1 (en) | 1994-11-16 | 1994-11-16 | Microwave dielectric ceramics |
| JP24446595A JP3329632B2 (en) | 1994-09-22 | 1995-09-22 | Dielectric ceramic composition for microwave |
| US08/804,280 US5750452A (en) | 1994-09-22 | 1997-03-03 | Dielectric ceramic composition for microwave |
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