JP2009234849A - 半導体磁器組成物−電極接合体の製造方法 - Google Patents
半導体磁器組成物−電極接合体の製造方法 Download PDFInfo
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Abstract
【解決手段】 BaTiO3のBaの一部がBi−Naで置換され、結晶粒界にP型半導体を有する半導体磁器組成物に電極を接合した半導体磁器組成物−電極接合体であって、電極接合後に100℃以上600℃以下で0.5時間以上24時間以下の熱処理を施す半導体磁器組成物−電極接合体の製造方法。
【選択図】なし
Description
分割仮焼法においては、BT仮焼粉を用意するに際して、BaCO3、TiO2と半導体化元素の原料粉末、例えば、La2O3やNb2O5を混合して混合原料粉末を作製し、仮焼するが、これまでは、完全な単一相を形成させるために、仮焼温度を900℃〜1300℃の範囲で実施していた。これに対して、残存法は、この仮焼温度をこれまでより低い900℃以下で実施し、(BaR)TiO3又はBa(TiM)O3 を完全に形成させずに、仮焼粉中にBaCO3、TiO2を一部残存させるものである。
添加法において、BT仮焼粉を用意するには、BaCO3、TiO2と半導体化元素の原料粉末、例えば、La2O3やNb2O5を混合して混合原料粉末を作製し、仮焼する。仮焼温度は1000℃以上が好ましい。仮焼温度が1000℃未満では(BaR)TiO3又はBa(TiM)O3 の完全な単一相が形成されないため好ましくない。完全な単一相が形成されないと未反応のBaCO3、TiO2が残存することとなり、BaCO3粉及び/又はTiO2粉の添加を前提とするためその添加量の予測が困難になるためであるが、若干のBaCO3やTiO2の残存は許容できる。好ましい仮焼温度は1000℃〜1300℃である。仮焼時間は0.5時間〜10時間が好ましく、2〜6時間がより好ましい。
不完全焼結法において、BT仮焼粉を用意する工程、BNT仮焼粉を用意する工程、BT仮焼粉とBNT仮焼粉を混合(粉砕)する工程、成形工程については、上述した添加法と同様である。
残存法を用い次のようにして半導体磁器組成物を得た。BaCO3、TiO2、La2O3の原料粉末を準備し、(Ba0.994La0.006)TiO3となるように配合し、純水で混合した。得られた混合原料粉末を900℃4時間大気中で仮焼し、BT仮焼粉を用意した。
(実施例18)
BaCO3、TiO2、Nb2O3の原料粉末を準備し、Ba(Ti0.997Nb0.003)O3となるように配合し、純水で混合した。得られた混合原料粉末を900℃4時間大気中で仮焼し、BT仮焼粉を用意した。
(比較例6)
実施例1と同様の方法で半導体磁器組成物を焼結後、300℃で3時間の熱処理を行った。その後、実施例1と同様の方法で電極を形成し、特性評価を行った。得られた結果を表1に示す。
Claims (3)
- BaTiO3のBaの一部がBi−Naで置換され、結晶粒界にP型半導体を有する半導体磁器組成物に電極を接合した半導体磁器組成物−電極接合体であって、半導体磁器組成物に電極を接合した後に100℃以上600℃以下で0.5時間以上24時間以下の熱処理を施すことを特徴とする半導体磁器組成物−電極接合体の製造方法。
- 前記半導体磁器組成物の組成式を[(BiNa)x(Ba1−yRy)1−x]TiO3と表し(但しRは希土類元素のうち少なくとも一種)、0<x≦0.3、0<y≦0.02を満足する請求項1に記載の半導体磁器組成物−電極接合体の製造方法。
- 前記半導体磁器組成物の組成式を[(BiNa)xBa1−x][Ti1−zMz]O3と表し(但しMはNb、Sbのうち少なくとも一種)、0<x≦0.3、0<z≦0.005を満足する請求項1に記載の半導体磁器組成物−電極接合体の製造方法。
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JP2008082669A JP5590494B2 (ja) | 2008-03-27 | 2008-03-27 | 半導体磁器組成物−電極接合体の製造方法 |
KR1020107019265A KR101463646B1 (ko) | 2008-03-27 | 2009-03-12 | 반도체 자기 조성물-전극접합체의 제조 방법 |
US12/920,377 US7993965B2 (en) | 2008-03-27 | 2009-03-12 | Process for producing semiconductive porcelain composition/electrode assembly |
PCT/JP2009/054810 WO2009119335A1 (ja) | 2008-03-27 | 2009-03-12 | 半導体磁器組成物-電極接合体の製造方法 |
EP09726092A EP2256100A4 (en) | 2008-03-27 | 2009-03-12 | METHOD FOR PRODUCING A SEMICONDUCTOR PORCELAIN COMPOSITION AND AN ELECTRODE ARRANGEMENT |
CN200980107174.5A CN101959830B (zh) | 2008-03-27 | 2009-03-12 | 制造半导体陶瓷组成物/电极组件的工艺 |
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WO2011043344A1 (ja) * | 2009-10-06 | 2011-04-14 | 日立金属株式会社 | 半導体磁器組成物およびその製造方法、ptc素子および発熱モジュール |
WO2011126040A1 (ja) * | 2010-04-08 | 2011-10-13 | 日立金属株式会社 | Ptc素子と発熱体モジュール |
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US7993965B2 (en) | 2011-08-09 |
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KR20100129284A (ko) | 2010-12-08 |
WO2009119335A1 (ja) | 2009-10-01 |
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US20110039369A1 (en) | 2011-02-17 |
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