High temperature thermistor composition
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTomizo Matsuoka, Yoshihiro Matsuo, Shigeru Hayakawa
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Abstract
A high temperature thermistor composition comprising a spinel-type Mg Al.sub.2 O.sub.4 and perovskite-type La CrO.sub.3 or (La, Sr) CrO.sub.3 is usable for the temperature range from 400.degree. to 600.degree. C, and a high temperature thermistor composition comprising spinel-type solid solution Mg(Al, Cr).sub.2 O.sub.4 and perovskite-type solid solution (La, Sr) CrO.sub.3 or LaCrO.sub.3 is usable for a higher temperature range up to 1000.degree. C.
Claims4
A high temperature thermistor composition comprising 10 to 90 mole % of spinel-type MgAl.sub.2 O.sub.4 and 10 to 90 mole % of perovskite-type LaCrO.sub.3.
A high temperature thermistor composition having the ternary system A.MgAl.sub.2 O.sub.4 --B.MgCr.sub.2 O.sub.4 --C.LaCrO.sub.3, wherein said composition is defined by the area of FIG. 2 enclosed by following six composition points;
- ______________________________________ (a) A=0.679 B=0.291 C=0.03 (b) A=0.891 B=0.009 C=0.10 (c) A=0.776 B=0.024 C=0.20 (d) A=0.24 B=0.56 C=0.20 (e) A=0.09 B=0.81 C=0.10 (f) A=0.291 B=0.679 C=0.03. ______________________________________
A high temperature thermistor composition having the ternary system A.MgAl.sub.2 O.sub.4 --B.MgCr.sub.2 O.sub.4 --C.(La.sub.1.sub.-y Sr.sub.y)CrO.sub.3, wherein y is defined as 0.05.ltoreq.y.ltoreq.0.2, wherein said composition is defined by the area of FIG. 2 enclosed by following four composition points;
- ______________________________________ (a') A=0.994 B=0.001 C=0.005 (b') A=0.4495 B=0.0005 C=0.55 (c') A=0.0225 B=0.4275 C=0.55 (d') A=0.050 B=0.945 C=0.005. ______________________________________
Dependencies are inferred from the claim text.