JP5907532B2 - Na−Si−B組成を有するホウ化物、ホウ化物の多結晶反応焼結体及びその製造方法 - Google Patents
Na−Si−B組成を有するホウ化物、ホウ化物の多結晶反応焼結体及びその製造方法 Download PDFInfo
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Description
(1)Na−Si−B組成を有する三元系ホウ化物であって、前記三元系ホウ化物が、一般式、Na x Si y B z で表される化合物(0<x、x<y<4x、8x<z<20x)であることを特徴とするNa−Si−B組成を有するホウ化物。
(2)ホウ化物の結晶構造が、六方晶系又は菱面体晶系であることを特徴とする(1)に記載のNa−Si−B組成を有するホウ化物。
(3)Na−M(MはSi及び/又はCを表す)−B組成を有するホウ化物の多結晶反応焼結体であって、前記ホウ化物が、一般式、Na x Si y B z で表される化合物(0<x、x<y<4x、8x<z<20x)であることを特徴とするホウ化物の多結晶反応焼結体。
(4)高純度Ar雰囲気中で、Na:Si:Bのモル比が5:1:6、または3:1:1となるように、金属Na、Si粉末、非晶質又は結晶質Bとを焼結BN坩堝に入れ、前記焼結BN坩堝を反応容器内部に設置、高純度Ar雰囲気中で密閉し、これを電気炉内に設置し、800〜1000℃まで2時間昇温して24時間保持した後、室温まで冷却することを特徴とする(3)に記載のホウ化物の多結晶反応焼結体の製造方法。
(5)予め粉末Bと粉末Siとをモル比4:X(X=1,2および3)となるように秤量し、圧粉し、BとSiの混合成形体を作製した後、高純度Ar雰囲気内で0.5gの金属Naと前記混合成形体を別々のBN坩堝に入れ、これらを反応容器内に別々に設置し、高純度Ar雰囲気中で密閉し、これを電気炉内に設置し、900℃まで2時間昇温し、24時間保持し、室温まで冷却することを特徴とする(3)に記載のホウ化物の多結晶反応焼結体の製造方法。
(6)非晶質のBと、Cとしてカーボンブラック粉末をモル比で5:1となるように秤量し、混合し、圧粉し、BとCの混合成形体を作製し、前記混合成形体を高純度Ar雰囲気内で0.2gの金属Naと共にBN坩堝に入れ、これを反応容器内に設置、高純度Ar雰囲気中で密閉し、800〜1000℃まで2時間昇温し、24時間保持後、室温まで冷却することを特徴とする(3)に記載のホウ化物の多結晶反応焼結体の製造方法。
<Na−Si−Bホウ化物>
本発明のNa−Si−Bホウ化物は、Na、Si、Bを混合して、通常は800℃以上の高温で加熱することにより得られる。なお、本発明のNa−Si−Bホウ化物においては、Na−Si−Bの組成のホウ化物の生成を阻害しない限り原料や反応装置由来の微量の不純物の混入が許容されることは言うまでもない。
<Na−Si−Bホウ化物の製造>
本発明のNa−Si−Bホウ化物は、通常、上記のNa、Si、Bの各成分を特定の配合量秤量を基準的目安として、これらを不活性ガスとともに反応容器等に密封して加熱することにより得られる。
<Na−M(MはSi及び/又はCを表す)−Bホウ化物の多結晶反応焼結体>
本発明のNa−M(Mはケイ素(Si)及び/又は炭素(C)を表す)−Bホウ化物の多結晶反応焼結体(以下、単に、ホウ化物多結晶体又は多結晶体ともいう)は、上記本発明のNa−Si−Bホウ化物等を焼結させることにより得られ、該ホウ化物と同様の組成を有するものである。本発明のNa−M(MはSi及び/又はCを表す)−Bホウ化物の反応焼結体の製造に当たっては、前駆体として上記Na−Si−Bホウ化物と同様のものを用いることができる。
<Na−Si−Bホウ化物の多結晶体の製造(1)>
B成形体を用いる製造方法においては、まず、非晶質のBを圧粉してBの成形体を作製する。次に不活性ガス雰囲気中でNa:Si:Bがモル比で基準目安1〜10:0.1〜5:0.1〜10の範囲で、より好ましくは3:1:1となるようにNa及びSiを秤量し、反応容器に密封して、前記本発明の条件の範囲で加熱した後、冷却してNa−Si−Bホウ化物多結晶体を製造することができる。
<Na−Si−Bホウ化物多結晶体の製造(2)>
BとSiの混合成形体を用いる製造方法においては、非晶質のBとSiをモル比が標準目安として4:x(x=1〜4)になるように秤量して混合した後、圧粉してBとSiの混合成形体を作製する。次に、不活性ガス雰囲気中でB、Siの混合成形体と、Naを別々のルツボに入れた後2つのルツボを反応容器に密封して、前記本発明の条件の範囲で加熱した後、冷却する。この方法では、Naを蒸気相より供給し、B、Siの混合成形体と化合させることにより、Na−Si−Bホウ化物多結晶体を製造することができる。
<Na−C−Bホウ化物多結晶体の製造>
BとCの混合成形体を用いる製造方法においては、BとCをモル比が基準目安としてB/C=2〜8になるように秤量して混合した後、圧粉してBとCの混合成形体を作製する。次に、不活性ガス雰囲気中でB、Cの混合成形体とNaを反応容器に密封し、前記本発明の条件の範囲で加熱した後、冷却することにより、Na−C−Bホウ化物多結晶体を製造することができる。前記モル比B/C=5とすることで、NaCB5ホウ化物多結晶体を製造することができる。
2 ケイ素
3 ホウ素
4 ホウ素成形体
5 ホウ素とケイ素の成形体
6 BNルツボ
7 反応器
8 キャップ
9 ホウ素と炭素の成形体
Claims (6)
- Na−Si−B組成を有する三元系ホウ化物であって、前記三元系ホウ化物が、一般式、Na x Si y B z で表される化合物(0<x、x<y<4x、8x<z<20x)であることを特徴とするNa−Si−B組成を有するホウ化物。
- ホウ化物の結晶構造が、六方晶系又は菱面体晶系であることを特徴とする請求項1に記載のNa−Si−B組成を有するホウ化物。
- Na−M(MはSi及び/又はCを表す)−B組成を有するホウ化物の多結晶反応焼結体であって、前記ホウ化物が、一般式、Na x Si y B z で表される化合物(0<x、x<y<4x、8x<z<20x)であることを特徴とするホウ化物の多結晶反応焼結体。
- 高純度Ar雰囲気中で、Na:Si:Bのモル比が5:1:6、または3:1:1となるように、金属Na、Si粉末、非晶質又は結晶質Bとを焼結BN坩堝に入れ、前記焼結BN坩堝を反応容器内部に設置、高純度Ar雰囲気中で密閉し、これを電気炉内に設置し、800〜1000℃まで2時間昇温して24時間保持した後、室温まで冷却することを特徴とする請求項3に記載のホウ化物の多結晶反応焼結体の製造方法。
- 予め粉末Bと粉末Siとをモル比4:X(X=1,2および3)となるように秤量し、圧粉し、BとSiの混合成形体を作製した後、高純度Ar雰囲気内で0.5gの金属Naと前記混合成形体を別々のBN坩堝に入れ、これらを反応容器内に別々に設置し、高純度Ar雰囲気中で密閉し、これを電気炉内に設置し、900℃まで2時間昇温し、24時間保持し、室温まで冷却することを特徴とする請求項3に記載のホウ化物の多結晶反応焼結体の製造方法。
- 非晶質のBと、Cとしてカーボンブラック粉末をモル比で5:1となるように秤量し、混合し、圧粉し、BとCの混合成形体を作製し、前記混合成形体を高純度Ar雰囲気内で0.2gの金属Naと共にBN坩堝に入れ、これを反応容器内に設置、高純度Ar雰囲気中で密閉し、800〜1000℃まで2時間昇温し、24時間保持後、室温まで冷却することを特徴とする請求項3に記載のホウ化物の多結晶反応焼結体の製造方法。
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Application Number | Priority Date | Filing Date | Title |
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JP2010183889 | 2010-08-19 | ||
JP2010183892 | 2010-08-19 | ||
JP2010183889 | 2010-08-19 | ||
JP2010183892 | 2010-08-19 | ||
PCT/JP2011/068619 WO2012023568A1 (ja) | 2010-08-19 | 2011-08-17 | Na-Si-B組成を有するホウ化物、ホウ化物の多結晶反応焼結体及びその製造方法 |
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JPWO2012023568A1 JPWO2012023568A1 (ja) | 2013-10-28 |
JP5907532B2 true JP5907532B2 (ja) | 2016-04-26 |
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JPN6011054945; GRUHN Thomas: 'Comparative ab initio study of half-Heusler compounds for optoelectronic applications' The American Physical Society , 20100930, 125210/1頁-125210/10頁 * |
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