JP5537688B2 - 新規な熱電材料及びその製造方法、並びにそれを用いた熱電部品 - Google Patents
新規な熱電材料及びその製造方法、並びにそれを用いた熱電部品 Download PDFInfo
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- 239000000463 material Substances 0.000 title claims description 46
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 64
- 239000000126 substance Substances 0.000 claims description 17
- 229910052797 bismuth Inorganic materials 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 4
- 229910052714 tellurium Inorganic materials 0.000 claims description 3
- 230000002950 deficient Effects 0.000 claims description 2
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 238000002156 mixing Methods 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000779 depleting effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- WKBPZYKAUNRMKP-UHFFFAOYSA-N 1-[2-(2,4-dichlorophenyl)pentyl]1,2,4-triazole Chemical compound C=1C=C(Cl)C=C(Cl)C=1C(CCC)CN1C=NC=N1 WKBPZYKAUNRMKP-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
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- C01G29/00—Compounds of bismuth
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Description
。
るか大きい。したがって、BiCuOTeは熱電変換材料として非常に有用であるが、電気伝導度が相対的に低い。電気伝導度はキャリアである正孔の濃度を増加させることで向上できるが、本発明ではBi、Cu、Oのうち少なくともいずれか1つの元素を相対的に欠乏させることで達成することができる。
BiCuOTeの合成
まず、BiCuOTeを合成するため、Bi2O3(Aldrich、99.9%、100mesh)1.1198g、Bi(Aldrich、99.99%、<10m)0.5022g、Cu(Aldrich、99.7%、3m)0.4581g、Te(Aldrich、99.99%、〜100mesh)0.9199gをめのう乳鉢(agate
mortar)を用いてよく混合した。混合した材料はシリカチューブに入れて真空密封し、510℃で15時間加熱することでBiCuOTe粉末を得た。
vance XRD)のサンプルホルダーに充填し、X線はCuKα1(λ=1.5405Å)、印加電圧50kV、印加電流40mAで0.02度間隔でスキャンして測定した。
図1を参照すれば、測定されたパターンと表1の結果による計算されたパターンとがよく一致することが分かり、これにより本参照例で得られた物質がBiCuOTeであることが同定された。
uperlattice)を示す。
Bi1-xCuOTeの合成
BiCuOTeのBiの一部を欠乏させるために各原料粉末の混合量を次のように調節して混合したことを除き、前述した参照例と基本的に同様の方法でBi1-xCuOTeを
合成した。合成のための各原料粉末の混合量は次のようである(単位:g)。
BiCu1-yOTeの合成
BiCuOTeのCuの一部を欠乏させるために各原料粉末の混合量を次のように調節して混合したことを除き、前述した参照例と基本的に同様の方法でBiCu1-yOTeを
合成した。合成のための各原料粉末の混合量は次のようである(単位:g)。
Bi0.96CuO0.94Teの合成
Bi2O3の混合量を相対的に減らしてBi及びOの一部を同時に欠乏させたことを除き、前述した参照例と基本的に同様の方法でBi0.96CuO0.94Teを合成した。合成のための各原料粉末の混合量は次のようである(単位:g)。
前述した方法で合成した参照例と実施例の各試料のうち一部をそれぞれ直径4mm、長さ15mmの円柱に成形した後、CIP(Cold Isostatic Press)を使用して200MPaの圧力を印加した。次いで、得られた結果物を石英管に入れて510℃で10時間真空焼結した。
Claims (15)
- 下記化学式1で表される熱電変換材料;
<化学式1>
Bi1-xCu1-yO1-zTe
化学式1において、0≦x<1、0≦y<1、0≦z<1及びx+y+z>0である。 - 化学式1のx、y及びzが、それぞれ0≦x≦0.5、0≦y≦0.5及び0≦z≦0.5であることを特徴とする請求項1に記載の熱電変換材料。
- 化学式1のx、y及びzが、それぞれ0≦x≦0.2、0≦y≦0.2及び0≦z≦0.2であることを特徴とする請求項2に記載の熱電変換材料。
- 化学式1のx、y及びzが、それぞれ0<x≦0.1、y=0及びz=0であることを特徴とする請求項3に記載の熱電変換材料。
- 化学式1のx、y及びzが、それぞれx=0、0<y≦0.2及びz=0であることを特徴とする請求項3に記載の熱電変換材料。
- 化学式1のx、y及びzが、それぞれ0<x≦0.1、y=0及び0<z≦0.1であることを特徴とする請求項3に記載の熱電変換材料。
- BiCuTe層とO層とがc‐結晶軸に沿って繰り返される自然的超格子構造を示すBiCuOTe系化合物半導体からなり、Bi,Cu及びOの少なくとも一つが一部欠乏していることを特徴とする熱電変換材料。
- x、y及びzを、それぞれBi,Cu及びOの欠乏率としたとき、 x、y及びzが、それぞれ0≦x≦0.5、0≦y≦0.5及び0≦z≦0.5であることを特徴とする請求項7に記載の熱電変換材料。
- x、y及びzが、それぞれ0≦x≦0.2、0≦y≦0.2及び0≦z≦0.2であることを特徴とする請求項8に記載の熱電変換材料。
- x、y及びzが、それぞれ0<x≦0.1、y=0及びz=0であることを特徴とする請求項9に記載の熱電変換材料。
- x、y及びzが、それぞれx=0、0<y≦0.2及びz=0であることを特徴とする請求項9に記載の熱電変換材料。
- x、y及びzが、それぞれ0<x≦0.1、y=0及び0<z≦0.1であることを特徴とする請求項9に記載の熱電変換材料。
- Bi2O3、Bi、Cu及びTeの各粉末を混合した後、焼結することで請求項1から請求項12のいずれか1項に記載の熱電変換材料を製造する方法。
- 前記焼結時の温度が400から570℃であることを特徴とする請求項13に記載の熱電変換材料を製造する方法。
- 請求項1から請求項12のうちいずれか1項に記載の熱電変換材料を含む熱電変換素子。
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CN102339946B (zh) * | 2010-07-20 | 2014-06-18 | 中国科学院上海硅酸盐研究所 | 一种高性能热电复合材料及其制备方法 |
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