JPWO2010067866A1 - 半導体セラミック及び正特性サーミスタ - Google Patents
半導体セラミック及び正特性サーミスタ Download PDFInfo
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Abstract
Description
ここで、M1は、Li、Na、Kに代表されるアルカリ金属元素を示している。また、Lnは半導体化剤となる希土類元素を示している。この希土類元素Lnとしては、半導体化剤としての作用を奏するものであれば、特に限定されるものではないが、La、Y、Sm、Nd、Dy、及びGdの群から選択された1種以上を好んで使用することができる。
このようにモル比mを、上記数式(1)の範囲に設定することにより、抵抗値の立ち上がり特性を良好なものとすることができる。
すなわち、Baの一部をCaで置換することにより、結晶軸のc軸とa軸の比が大きくなって結晶の正方晶性が向上し強誘電性が高くなる。そしてその結果、自発分極が大きくなって粒界障壁を打ち消すことができ、これにより半導体セラミックの低抵抗化が可能となり、例えばヒータに好適なPTCサーミスタを実現することが可能となる。
すなわち、Aサイト中のCaのモル比yが0.042未満の場合は、Caの含有量が少ないため、結晶の正方晶性を十分に上げることができず、結晶粒径も大きくならず、所望の低抵抗を有する半導体セラミックを得るのは困難である。
(Ba1-w-x-y-zM1wBixCayLnz)mTiO3+nMn…(D)
ただし、nは、0.0001≦n≦0.0020である。
ここで、ρ100、ρ10は、室温25℃で測定したときの電気抵抗率ρ0に対し、それぞれ100倍、10倍のときの電気抵抗率を示し、T100−T10は、ρ100、ρ10における温度を示している。
2a、2b 外部電極
Claims (6)
- 実質的にPbを含まない非鉛系の半導体セラミックであって、
一般式AmBO3で表されるペロブスカイト型構造を有するBamTiO3系組成物を主成分とし、
Aサイトを構成するBaの一部が、少なくともアルカリ金属元素、Bi、及び希土類元素で置換されると共に、
AサイトとBサイトのモル比mが、0.990≦m≦0.999であることを特徴とする半導体セラミック。 - 前記Baの一部がCaで置換されると共に、前記Aサイトを構成する元素の総モル数を1モルとしたときの前記Caの含有量が、モル比換算で0.042〜0.20であることを特徴とする請求項1記載の半導体セラミック。
- 前記Caの含有量は、モル比換算で0.125〜0.175であることを特徴とする請求項2記載の半導体セラミック。
- 前記モル比mは、0.990≦m≦0.995であることを特徴とする請求項1乃至請求項3のいずれかに記載の半導体セラミック。
- AサイトとBサイトのモル比mが、0.996≦m≦0.999であることを特徴とする請求項3記載の半導体セラミック。
- 部品素体の表面に一対の外部電極が形成された正特性サーミスタにおいて、
前記部品素体が、請求項1乃至請求項5のいずれかに記載の半導体セラミックで形成されていることを特徴とする正特性サーミスタ。
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EP (1) | EP2371789B1 (ja) |
JP (1) | JP5327554B2 (ja) |
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CN102245537A (zh) * | 2008-12-12 | 2011-11-16 | 株式会社村田制作所 | 半导体陶瓷以及正特性热敏电阻 |
WO2010067867A1 (ja) * | 2008-12-12 | 2010-06-17 | 株式会社 村田製作所 | 半導体セラミック及び正特性サーミスタ |
EP2840073A4 (en) | 2012-04-20 | 2015-11-25 | Hitachi Metals Ltd | SEMICONDUCTOR CERAMIC COMPOSITION, PROCESS FOR PRODUCING THE SAME, AND POSITIVE TEMPERATURE COEFFICIENT ELEMENT (PTC) |
WO2014141814A1 (ja) | 2013-03-11 | 2014-09-18 | Tdk株式会社 | Ptcサーミスタ磁器組成物およびptcサーミスタ素子 |
CN105359227A (zh) | 2013-07-02 | 2016-02-24 | 日立金属株式会社 | Ptc元件和发热模块 |
JP6337689B2 (ja) | 2013-10-03 | 2018-06-06 | Tdk株式会社 | 半導体磁器組成物およびptcサーミスタ |
WO2016084562A1 (ja) * | 2014-11-26 | 2016-06-02 | 株式会社村田製作所 | チタン酸バリウム系半導体セラミック、チタン酸バリウム系半導体セラミック組成物および温度検知用正特性サーミスタ |
DE112019002039T5 (de) | 2018-04-17 | 2021-03-11 | Avx Corporation | Varistor mit Hochtemperaturanwendungen |
KR20200037688A (ko) | 2018-10-01 | 2020-04-09 | 이창모 | 반도체 자기 조성물용 전극 재료 |
CN113956038A (zh) * | 2021-12-01 | 2022-01-21 | 中国科学院新疆理化技术研究所 | 一种铈掺杂钙钛矿型高温热敏陶瓷电阻材料及其制备方法 |
KR20240036849A (ko) | 2022-09-14 | 2024-03-21 | 씨피에스 주식회사 | 반도체 자기 조성물용 전극 재료 |
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JPS56169301A (en) | 1980-06-02 | 1981-12-26 | Tohoku Metal Ind Ltd | Method of producing barium titanate semiconductor porcelain |
JP2558489B2 (ja) * | 1988-03-01 | 1996-11-27 | 株式会社クラベ | 正特性半導体磁器 |
US5624707A (en) * | 1991-12-13 | 1997-04-29 | Symetrix Corporation | Method of forming ABO3 films with excess B-site modifiers |
JPH05275203A (ja) * | 1992-03-25 | 1993-10-22 | Chichibu Cement Co Ltd | 半導体磁器組成物 |
DE4221309A1 (de) * | 1992-06-29 | 1994-01-05 | Abb Research Ltd | Strombegrenzendes Element |
JPH10152372A (ja) * | 1996-11-22 | 1998-06-09 | Matsushita Electric Ind Co Ltd | チタン酸バリウム系半導体磁器及びその製造方法 |
JP4080576B2 (ja) * | 1997-09-05 | 2008-04-23 | Tdk株式会社 | 正特性半導体磁器の製造方法 |
JP3039513B2 (ja) * | 1998-05-12 | 2000-05-08 | 株式会社村田製作所 | チタン酸バリウム粉末、および半導体セラミック、ならびに半導体セラミック素子 |
JP3812268B2 (ja) * | 1999-05-20 | 2006-08-23 | 株式会社村田製作所 | 積層型半導体セラミック素子 |
JP4765258B2 (ja) | 2004-03-12 | 2011-09-07 | 日立金属株式会社 | 半導体磁器組成物 |
CN101516802B (zh) * | 2006-09-28 | 2011-11-23 | 株式会社村田制作所 | 钛酸钡系半导体瓷组合物和使用其的ptc元件 |
EP2159207B1 (en) * | 2007-06-14 | 2016-11-16 | Murata Manufacturing Co. Ltd. | Semiconductor ceramic material |
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