JP6424728B2 - 半導体磁器組成物およびptcサーミスタ - Google Patents
半導体磁器組成物およびptcサーミスタ Download PDFInfo
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Description
このPTCサーミスタは、温度の上昇に対して抵抗が増加することから、自己制御型ヒーター素子、過電流保護素子、過熱検知素子等として利用されている。従来、PTCサーミスタは、主成分のチタン酸バリウム(BaTiO3)に微量の希土類元素等を添加して半導体化させたもので、キュリー点以下では低抵抗であるが、それ以上では数桁にわたって急激に高抵抗化する。
α[%/℃]=(lnR1−lnRC)×100/(T1−TC)
R1はT1における比抵抗、T1はTC+20℃を示す温度、TCはキュリー点、RCはTCにおける比抵抗である。
(Ba1−x−y−wBixAyREw)m(Ti1−zTMz)O3 (1)
上記一般式(1)において、
上記Aは、NaまたはKより選択される少なくとも1種の元素であり、
上記REは、Y、La、Ce、Pr、Nd、Sm、Gd、Dy及びErからなる群より選択される少なくとも1種の元素であり、
上記TMは、V、Nb及びTaからなる群より選択される少なくとも1種の元素であり、
w、x、y、z、(いずれもmol)、及びm(Baサイト/Tiサイトのmol比)は、下記式(2)〜(5)を満足し、
0.007≦x≦0.125 (2)
x<y≦2.0x (3)
0≦(w+z)≦0.010 (4)
0.940≦m≦0.999 (5)
さらに上記半導体磁器組成物は、SrをTiサイト1molに対して、元素換算で0.010mol以上、0.050mol以下の割合で含み、かつ、Tiサイトに対する上記Srのmol比をuとしたとき、上記Biのmol比xとの関係が下記式(6)を満足することを特徴とする半導体磁器組成物。
u≦1.8x−0.008 (6)
(Ba1−x−y−wBixAyREw)m(Ti1−zTMz)O3 (1)
[ただし、AはNaまたはKより選択される少なくとも1種の元素、REはY、La、Ce、Pr、Nd、Sm、Gd、Dy及びErからなる群より選択される少なくとも1種の元素、TMはV、Nb及びTaからなる群より選択される少なくとも1種の元素]で表されるものを主成分とし、更にSrを副成分として含むものである。
0.007≦x≦0.125 (2)
x<y≦2.0x (3)
0≦(w+z)≦0.010 (4)
0.940≦m≦0.999 (5)
さらに、一般式(1)で示す半導体磁器組成物に対して、SrをTiサイト1molに対して元素換算で0.010mol以上、0.050mol以下の割合で含み、かつSrのmol比uとBiのmol比xは
u≦1.8x−0.008 (6)
を満足するものである。
出発原料としてBaCO3、TiO2、Bi2O3、Na2CO3、K2CO3、SrCO3、SiO2、MnCO3、ZnO、CuO、Fe2O3、Al2O3、REの酸化物(例えばY2O3)、TMの酸化物(例えば、Nb2O5)を準備し、焼結後の組成が表1〜8となるように各原料を秤量した後、ボールミルを用いてアセトン中で湿式混合した後に乾燥を行い、900℃で2時間仮焼した。
焼成時の雰囲気を窒素雰囲気中とし、さらに800℃の大気中にて熱処理を行った以外は、実施例1と同様にしてPTCサーミスタを作製し、実施例1と同様の評価を行った。本発明における実施例2の結果を表8に示す。
2 セラミックス素体
3a、3b 電極
Claims (5)
- 下記一般式(1)で表され、
(Ba1−x−y−wBixAyREw)m(Ti1−zTMz)O3 (1)
前記一般式(1)において、
前記Aは、NaまたはKより選択される少なくとも1種の元素であり、
前記REは、Y、La、Ce、Pr、Nd、Sm、Gd、Dy及びErからなる群より選択される少なくとも1種の元素であり、
前記TMは、V、Nb及びTaからなる群より選択される少なくとも1種の元素であり、
w、x、y、z、(いずれもmol)、及びm(Baサイト/Tiサイトのmol比)は、下記式(2)〜(5)を満足し、
0.007≦x≦0.125 (2)
x<y≦2.0x (3)
0≦(w+z)≦0.010 (4)
0.940≦m≦0.999 (5)
さらに、Tiサイト1molに対し、Srを元素換算で0.010mol以上、0.050mol以下の割合で含み、且つ、前記Srのmol比uと前記Biのmol比xは下記式(6)を満足することを特徴とする半導体磁器組成物。
u≦1.8x−0.008 (6) - 前記半導体磁器組成物が、さらにTiサイト1molに対し、Siを元素換算で0.035mol以下の割合で含むことを特徴とする請求項1に記載の半導体磁器組成物。
- 前記半導体磁器組成物が、さらにTiサイト1molに対し、Mnを元素換算で0.0015mol以下の割合で含むことを特徴とする請求項1または請求項2に記載の半導体磁器組成物。
- 前記半導体磁器組成物が、さらにTiサイト1molに対し、添加物M(Zn、Cu、Fe、Alの少なくとも一種)を元素換算で0.005mol以下の割合で含むことを特徴とする請求項1〜3のいずれか一項に記載の半導体磁器組成物。
- 請求項1〜4のいずれか一項に記載の半導体磁器組成物を用いて形成されたセラミック素体と、前記セラミック素体の表面に形成された電極とを備えたPTCサーミスタ。
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