JPH0413320B2 - - Google Patents
Info
- Publication number
- JPH0413320B2 JPH0413320B2 JP10691785A JP10691785A JPH0413320B2 JP H0413320 B2 JPH0413320 B2 JP H0413320B2 JP 10691785 A JP10691785 A JP 10691785A JP 10691785 A JP10691785 A JP 10691785A JP H0413320 B2 JPH0413320 B2 JP H0413320B2
- Authority
- JP
- Japan
- Prior art keywords
- forsterite
- single crystal
- heat treatment
- color
- oxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- 239000013078 crystal Substances 0.000 claims description 47
- 229910052839 forsterite Inorganic materials 0.000 claims description 33
- 238000010438 heat treatment Methods 0.000 claims description 33
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 31
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- 235000019646 color tone Nutrition 0.000 description 9
- 230000001590 oxidative effect Effects 0.000 description 7
- 239000010437 gem Substances 0.000 description 6
- 229910001751 gemstone Inorganic materials 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910004283 SiO 4 Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052609 olivine Inorganic materials 0.000 description 3
- 239000010450 olivine Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910001602 chrysoberyl Inorganic materials 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007716 flux method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 229910052594 sapphire Inorganic materials 0.000 description 2
- 239000010980 sapphire Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 229910001750 ruby Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は宝飾用合成フオルステライト単結晶の
熱処理法に関し、詳しくは酸化第二クロムを特定
量含有したフオルステライト単結晶を特定温度で
熱処理することによつて、多色性に加え、透明感
および鮮かな色調を付与する宝飾用合成フオルス
テライト単結晶の熱処理法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for heat treatment of synthetic forsterite single crystals for jewelry, and more specifically, a method for heat treating a forsterite single crystal containing a specific amount of chromic oxide at a specific temperature. In particular, it relates to a heat treatment method for synthetic forsterite single crystals for jewelry that imparts transparency and bright color in addition to pleochroism.
［従来の技術］
従来、宝石の色彩を改良する種々の試みがなさ
れており、例えば天然産ルビーの場合には、赤色
の鮮かさを増したり、色調を代えたりするため
に、1000℃前後で３昼夜程度加熱処理する方法が
知られている。[Prior Art] In the past, various attempts have been made to improve the color of gemstones. For example, in the case of naturally produced rubies, they were heated to around 1000℃ in order to increase the vividness of the red color or change the color tone. A method of heat treatment for about three days and nights is known.
また、人造宝石となる人工単結晶の製造方法に
おいても、それらの色調を調整する種々の方法が
提案されている。例えばキヤツアイとして知られ
ているクリソベリル単結晶の製造方法について
は、特公昭59−38194号公報、特公昭59−38195号
公報等に開示されており、例えば特公昭59−
38195号公報にはキヤツアイ特有の色彩を発現す
るTiO2成分をクリソベリル単結晶中に多量かつ
均質に固溶させるために、FZ法（フローテイン
グゾーン法）において、BeO、Al2O3、Ti2O3か
らなる組成のものを使用し、酸素分圧を特定した
非酸化性雰囲気下で単結晶を育成し、得られた単
結晶を酸化性雰囲気下で焼鈍する方法が開示され
ている。 Furthermore, various methods for adjusting the color tone of artificial single crystals used as artificial jewelry have been proposed. For example, a method for producing chrysoberyl single crystal known as "Kyatsuai" is disclosed in Japanese Patent Publication No. 59-38194, Japanese Patent Publication No. 38195-1980, etc.
Publication No. 38195 describes that in order to make a large amount and homogeneous solid solution of the two TiO components that produce the characteristic color of cat's eye in a chrysoberyl single crystal, BeO, Al 2 O 3 , and Ti 2 are used in the FZ method (floating zone method). A method is disclosed in which a single crystal having a composition consisting of O 3 is used, a single crystal is grown in a non-oxidizing atmosphere with a specified oxygen partial pressure, and the obtained single crystal is annealed in an oxidizing atmosphere.
また、ブルーサフアイヤ人工結晶の色彩を改良
する方法としては、特開昭59−174590号公報、特
開昭59−174599号公報等に開示されており、例え
ば特開昭59−174590号公報には、均一で色むらの
ない青色を得るためにブルーサフアイヤの原料に
炭素を特定量含有させ、FZ法により結晶を育成
し、酸化雰囲気炉で熱処理をする方法が開示され
ている。 In addition, methods for improving the color of blue sapphire artificial crystals are disclosed in JP-A-59-174590 and JP-A-59-174599, and for example, in JP-A-59-174590. discloses a method in which a specific amount of carbon is contained in the blue sapphire raw material, crystals are grown using the FZ method, and then heat treated in an oxidizing atmosphere furnace in order to obtain a uniform and even blue color.
ところで、オリビンは（Mg1−xFex）2SiO4（但
し、１≧ｘ≧０）で一般に表わされる鉱物であ
り、その中で透明度のよいものが宝石として用い
られている。このオリビンの基本組成となるフオ
ルステライト（Mg2SiO4）は種々の方法によつ
て合成できることが報告されている。例えば、ベ
ルヌーイ法については1963年にShankland等
（Amer.Mineral.、48、p.200）によつて、引上げ
法については1971年にFinch等（J.Cryltal
Grouth、８、p.307〜308）、および1974年に武居
等（J.Crystal Grouth、44、p.629〜631）によつ
て、それぞれフオルステライトの合成に成功した
ことが報告されている。さらに、フラツクス法に
ついては1972年にL.Vu TIEN等（J.Crystal
Grouth、13／14、（1972）、p.601〜603）によつ
て、フオルステライトの合成に成功したことが報
告されている。 By the way, olivine is a mineral generally expressed as (Mg1−xFex) 2 SiO 4 (1≧x≧0), and among them, those with good transparency are used as gemstones. It has been reported that forsterite (Mg 2 SiO 4 ), which is the basic composition of olivine, can be synthesized by various methods. For example, the Bernoulli method was described by Shankland et al. (Amer. Mineral., 48 , p. 200) in 1963, and the raising method was described by Finch et al. (J.
Grouth, 8 , p. 307-308) and Takei et al. (J.Crystal Grouth, 44 , p. 629-631) in 1974 reported successful synthesis of forsterite. Furthermore, regarding the flux method, L.Vu TIEN et al. (J.Crystal
Grouth, 13/14, (1972), p. 601-603) reported the successful synthesis of forsterite.
［発明の解決しようとする問題点］
しかしながら、これらのフオルステライトの合
成はいずれも地球科学上の重要性や鉱物学的な見
地から行なわれたものであり、得られた単結晶を
宝飾用として用いることについては何等考慮され
ていなかつた。しかも、一般のオリビンは、フオ
ルステライト（Mg2SiO4）に主として鉄（Fe）
を含有し淡い緑色を呈するだけであり、宝飾用に
用いられるものではなかつた。[Problems to be solved by the invention] However, all of these syntheses of forsterite were carried out from the viewpoint of importance in earth science and mineralogy, and the resulting single crystals were not used for jewelry. No consideration was given to its use. Moreover, ordinary olivine mainly contains iron (Fe) in forsterite (Mg 2 SiO 4 ).
It contained only a pale green color and was not used for jewelry.
以上述べたように、ルビーやキヤツアイ等の天
然宝石または人造宝石の色彩を改良する方法は
種々提案されており、またフオルステライトを合
成することも試みられているが、宝飾用に要求さ
れるような特性を有する合成フオルステライト単
結晶は未だ得られていない。 As mentioned above, various methods have been proposed to improve the color of natural gemstones or artificial gemstones such as ruby and cat's eye, and attempts have also been made to synthesize forstellite. A synthetic forsterite single crystal with these characteristics has not yet been obtained.
本発明は、上述の問題点を解決するためになさ
れたもので、多色性に加え、透明感および鮮かな
色調を付与する宝飾用合成フオルステライト単結
晶の熱処理法を提供することを目的とする。 The present invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide a heat treatment method for synthetic forsterite single crystals for jewelry, which imparts transparency and bright color in addition to pleochroism. do.
［問題点を解決するための手段および作用］
上記目的を達成するために、本発明は酸化マグ
ネシウム、酸化珪素を主成分とするフオルステラ
イト（Mg2SiO4）に、酸化第二クロム（Cr2O3）
を0.001〜4.0重量％含有させたフオルステライト
単結晶を、800〜1800℃で熱処理することを特徴
とする。[Means and effects for solving the problems] In order to achieve the above object, the present invention combines chromic oxide (Cr 2 O3 )
The feature is that a forsterite single crystal containing 0.001 to 4.0% by weight of is heat-treated at 800 to 1800°C.
本発明において用いられる酸化第二クロムを
0.001〜4.0重量％含有する合成フオルステライト
単結晶は次のようにして製造される。すなわち、
酸化マグネシウム、酸化珪素に、着色剤として酸
化第二クロムをその含有率が0.001〜4.0重量％と
なるように混合してなる原料を用い、FZ法、チ
ヨクラルスキー法、フラツクス法、ベルヌーイ法
等の公知の方法によつて製造される。 The chromic oxide used in the present invention is
A synthetic forsterite single crystal containing 0.001 to 4.0% by weight is produced as follows. That is,
Using raw materials made by mixing magnesium oxide, silicon oxide, and chromic oxide as a coloring agent at a content of 0.001 to 4.0% by weight, the FZ method, Czyochralski method, flux method, Bernoulli method, etc. Manufactured by a known method.
このように酸化第二クロムを含有させることに
よつて、得られるフオルステライト単結晶は観察
する方向によつて緑色、青色、すみれ色と異なつ
た色調を呈し、いわゆる多色性を示す。この含有
率が0.001重量％未満では宝飾用として使用する
のに必要な奇麗な色調が得られず、また、4.0重
量％を越えると色調が濃緑色となり透光性が失わ
れ、多色性が損われてしまう。 By including chromic oxide in this way, the resulting forsterite single crystal exhibits different color tones, such as green, blue, and violet, depending on the viewing direction, exhibiting so-called pleochroism. If this content is less than 0.001% by weight, it will not be possible to obtain the beautiful color tone necessary for use in jewelry, and if it exceeds 4.0% by weight, the color tone will become dark green, loss of translucency, and pleochroism. It will be damaged.
ここで均質で大型の結晶を得るにはチヨクラル
スキー法が最も適している。このチヨクラルスキ
ー法においては、酸化マグネシウム、酸化珪素お
よび酸化第二クロムを混合してなる原料を、イリ
ジウム製のるつぼ内に入れ、誘導加熱炉を使用す
る方法等の公知の加熱方法を用いて所望の温度に
加熱して溶融し、原料が完全に溶融した後、不活
性ガス雰囲気下で種晶を溶融物の表面と接触さ
せ、この種結晶をゆつくりと回転させながら引き
上げることにより、種結晶の下にフオルステライ
ト単結晶を育成させる。 In this case, the Czyochralski method is most suitable for obtaining homogeneous and large crystals. In the Czyochralski method, a raw material consisting of a mixture of magnesium oxide, silicon oxide and chromic oxide is placed in an iridium crucible and heated using a known heating method such as an induction heating furnace. After the raw material is completely melted by heating to the desired temperature, the seed crystal is brought into contact with the surface of the melt under an inert gas atmosphere, and the seed crystal is pulled up while rotating slowly. A forsterite single crystal is grown under the crystal.
本発明においては、このようにして得られた合
成フオルステライト単結晶を、さらに800〜1800
℃で熱処理する。加熱温度の下限を800℃とした
のは、これより低い温度で処理すると１週間以上
の加熱が必要となり実用に供しにくいからであ
り、上限を1800℃としたのは、これより温度が高
くなるとフオルステライト単結晶に部分的な融解
が生じて宝飾用としての奇麗な外観が得られない
からである。 In the present invention, the synthetic forsterite single crystal thus obtained is further 800 to 1800
Heat treat at ℃. The reason why we set the lower limit of the heating temperature to 800℃ is because processing at a lower temperature would require heating for more than a week, making it difficult to put it to practical use.The reason why we set the upper limit to 1800℃ is that if the temperature is higher than this, This is because partial melting occurs in the forsterite single crystal, making it impossible to obtain a beautiful appearance for use in jewelry.
本発明においては、800℃付近で熱処理する場
合は、この温度に保持して約１週間加熱し、1800
℃付近で熱処理する場合は、約６時間程度加熱す
るのが好ましい。このように、加熱温度によつて
熱処理時間を変化させる理由は、単結晶の融点に
近くなればなるほど格子欠陥の移動、再配列、合
体、消滅が起り易く、また低温になればなるほど
それらの現象が起こりにくく長時間を必要とする
ためである。 In the present invention, when heat treatment is performed at around 800°C, it is maintained at this temperature for about a week, and heated to 1800°C.
In the case of heat treatment at around 0.degree. C., it is preferable to heat for about 6 hours. The reason for changing the heat treatment time depending on the heating temperature is that the closer the heating temperature is to the melting point of the single crystal, the more likely lattice defects will move, rearrange, coalesce, and disappear, and the lower the temperature, the more likely these phenomena will occur. This is because it is difficult to occur and requires a long time.
本発明において用いられる熱処理方法として
は、雰囲気制御できる方法が好ましく、例えばシ
リコニツトやケラマツクス等の抵抗加熱炉や高周
波加熱炉で加熱する方法が挙げられる。高周波加
熱炉で加熱する方法は、サセプター（カーボン、
白金等）に高周波をのせて加熱する方法であり、
均熱帯を形成しにくいのに対し、抵抗加熱炉を用
いると均熱帯を形成しやすく温度管理が容易にな
るので、本発明においては抵抗加熱炉による熱処
理方法が好適に用いられる。 The heat treatment method used in the present invention is preferably a method in which the atmosphere can be controlled, such as a method of heating in a resistance heating furnace such as siliconite or Keramax or a high frequency heating furnace. The method of heating with a high frequency heating furnace uses a susceptor (carbon,
This is a method of heating a metal (platinum, etc.) by applying high frequency waves to it.
While it is difficult to form a soaking zone, when a resistance heating furnace is used, it is easy to form a soaking zone and temperature control becomes easy, so a heat treatment method using a resistance heating furnace is preferably used in the present invention.
また、本発明においては、より透明感を出し、
色調を鮮かにするために、必要に応じて酸素等の
酸化性雰囲気下もしくは水素等の還元性雰囲気
下、場合によつては熱処理を数回に分け、両方の
雰囲気下で熱処理を行なう。すなわち、不活性ガ
ス雰囲気中で育成した単結晶は酸素欠陥が生じや
すく、この場合には結晶中の酸素欠陥を埋めるた
めに酸化性雰囲気下での熱処理が必要となる。ま
た、高酸化性雰囲気下や還元性雰囲気下で育成し
た単結晶については、着色剤としてのクロムが必
要な価数にならないものが生じるので、これを安
定な３価にするために還元性雰囲気下での熱処理
が必要となる。従つて、単結晶を育成した条件等
に応じて酸化性雰囲気下または還元性雰囲気下の
うちいずれか、または両方の雰囲気下で熱処理が
行なわれる。 In addition, in the present invention, more transparency is achieved,
In order to brighten the color tone, the heat treatment is carried out under an oxidizing atmosphere such as oxygen or a reducing atmosphere such as hydrogen, if necessary, and in some cases the heat treatment is divided into several times and performed under both atmospheres. That is, a single crystal grown in an inert gas atmosphere is likely to have oxygen defects, and in this case, heat treatment in an oxidizing atmosphere is required to fill the oxygen defects in the crystal. In addition, for single crystals grown in highly oxidizing or reducing atmospheres, some chromium as a coloring agent does not have the required valence, so in order to make it stable trivalent, a reducing atmosphere is used. Heat treatment is required below. Therefore, heat treatment is performed in either an oxidizing atmosphere or a reducing atmosphere, or both, depending on the conditions under which the single crystal was grown.
［実施例］
以下、本発明を実施例および比較例に基づき具
体的に説明する。[Examples] The present invention will be specifically described below based on Examples and Comparative Examples.
実施例１および比較例１
酸化マグネシウム、酸化珪素および酸化第二ク
ロムを、それぞれ含有率が酸化マグネシウム、
56.76重量％、酸化珪素42.74重量％、酸化第二ク
ロム0.50重量％となるように混合して原料を調製
した。Example 1 and Comparative Example 1 Magnesium oxide, silicon oxide, and chromic oxide were contained in magnesium oxide, silicon oxide, and chromic oxide, respectively.
A raw material was prepared by mixing 56.76% by weight of silicon oxide, 42.74% by weight of silicon oxide, and 0.50% by weight of chromic oxide.
単結晶の育成は、高周波誘導加熱型チヨクラル
スキー炉で、直径80mmのイリジウム製るつぼを用
いて行なつた。まず、原料を投入したるつぼを石
英管中におき、この石英管中を不活性ガス雰囲気
に保ちながら昇温速度100℃／hrでるつぼを約
2000℃まで加熱し、その温度を５時間維持した。
その後、フオルステライト種結晶を融液中に投入
し、不活性ガス雰囲気下で種結晶の回転数を
30rpm、引上げ速度を２mm／hr、降温速度を35
℃／hrとして、フオルステライト単結晶を育成
し、酸化第二クロムを0.50重量％を含有するフオ
ルステライト単結晶Ａを得た（比較例１）。 The single crystal was grown in a high-frequency induction heating Czyochralski furnace using an iridium crucible with a diameter of 80 mm. First, a crucible containing raw materials is placed in a quartz tube, and the crucible is heated at a heating rate of 100℃/hr while maintaining an inert gas atmosphere inside the quartz tube.
It was heated to 2000°C and maintained at that temperature for 5 hours.
After that, the forsterite seed crystal is put into the melt, and the rotation speed of the seed crystal is controlled under an inert gas atmosphere.
30rpm, pulling rate 2mm/hr, cooling rate 35
C/hr, a forsterite single crystal was grown to obtain a forsterite single crystal A containing 0.50% by weight of chromic oxide (Comparative Example 1).
次に、比較例１と同様にして得られたフオルス
テライト単結晶Ｂを、大気中で、1550℃、28時間
熱処理して、フオルステライト単結晶Ｂを得た
（実施例１）。 Next, the forsterite single crystal B obtained in the same manner as in Comparative Example 1 was heat-treated at 1550° C. for 28 hours in the air to obtain the forsterite single crystal B (Example 1).
このようにして得られたフオルステライト単結
晶ＡおよびＢの吸収スペクトルを測定し、その結
果を第１図に示す。 The absorption spectra of the thus obtained forsterite single crystals A and B were measured, and the results are shown in FIG.
第１図から明らかなように、フオルステライト
単結晶ＡおよびＢを比較すると、熱処理を加えた
フオルステライト単結晶Ｂのほうが、吸収ピーク
の立ち上がりが急勾配、すなわちＳ／Ｎ比が大き
くなつており、かつ吸収量のバツクグランドが下
がつていて透明感の向上と色調の鮮かさが増した
ことが判る。なお、フオルステライト単結晶Ａお
よびＢは宝石カツトしたところ、いずれも多色性
を有していた。 As is clear from Figure 1, when comparing forsterite single crystals A and B, heat-treated forsterite single crystal B has a steeper absorption peak rise, that is, a larger S/N ratio. , and it can be seen that the background of the amount of absorption has decreased, and that the transparency and the vividness of the color tone have increased. In addition, when forsterite single crystals A and B were cut into gemstones, both had pleochroism.
［発明の効果］
以上説明したように、フオルステライトに酸化
第二クロムを特定量含有させ、次いで特定温度で
熱処理した本発明の宝飾用合成フオルステライト
単結晶の処理法によれば、黒ずんだ色調のもので
はなく、透明感を有し、また鮮やかな色調を呈し
たフオルステライト単結晶が得られる。しかも、
少量の酸化第二クロムを含有する合成フオルステ
ライト単結晶の特徴である多色性も有する。従つ
て、多色性に加え、透明感および鮮かな色調を付
与する本発明のフオルステライト単結晶は、人造
宝石としての用途に好適に適用できる。[Effects of the Invention] As explained above, according to the method for treating synthetic forsterite single crystals for jewelry of the present invention, in which forsterite is made to contain a specific amount of chromium oxide and then heat-treated at a specific temperature, a dark color tone can be obtained. The result is a forstellite single crystal that is transparent and has a vivid color tone. Moreover,
It also has pleochroism, which is characteristic of synthetic forsterite single crystals containing small amounts of chromic oxide. Therefore, the forsterite single crystal of the present invention, which imparts transparency and bright color in addition to pleochroism, can be suitably used as an artificial jewel.
第１図は実施例１および比較例１により得られ
たフオルステライト単結晶ＡおよびＢの吸収スペ
クトルであり、波長（nm）と吸収率（％）の関
係を示すグラフ。
FIG. 1 is an absorption spectrum of forsterite single crystals A and B obtained in Example 1 and Comparative Example 1, and is a graph showing the relationship between wavelength (nm) and absorption rate (%).
Claims (1)
フオルステライトに、酸化第二クロムを0.001〜
4.0重量％含有させたフオルステライト単結晶を、
800〜1800℃で熱処理することを特徴とする宝飾
用合成フオルステライト単結晶の熱処理法。1 Forsterite whose main components are magnesium oxide and silicon oxide, and 0.001 to 0.001 of chromic oxide
Forsterite single crystal containing 4.0% by weight,
A heat treatment method for synthetic forsterite single crystal for jewelry, which is characterized by heat treatment at 800 to 1800°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10691785A JPS61266396A (en) | 1985-05-21 | 1985-05-21 | Heat-treatment of single crystal of ornamental synthetic forsterite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10691785A JPS61266396A (en) | 1985-05-21 | 1985-05-21 | Heat-treatment of single crystal of ornamental synthetic forsterite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61266396A JPS61266396A (en) | 1986-11-26 |
| JPH0413320B2 true JPH0413320B2 (en) | 1992-03-09 |
Family
ID=14445775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10691785A Granted JPS61266396A (en) | 1985-05-21 | 1985-05-21 | Heat-treatment of single crystal of ornamental synthetic forsterite |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61266396A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3560150B2 (en) * | 2000-09-14 | 2004-09-02 | 日本精機株式会社 | Organic EL device |
-
1985
- 1985-05-21 JP JP10691785A patent/JPS61266396A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61266396A (en) | 1986-11-26 |
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