Ceramic material and resistive element

Patent metadata

Field	Value
Publication number	US-10364161-B2
Application number	US-201816183774-A
Country	US
Kind code	B2
Filing date	Nov 8, 2018
Priority date	May 24, 2016
Publication date	Jul 30, 2019
Grant date	Jul 30, 2019

Abstract

A ceramic material has a composition represented by the formula: La 1-x-y AE y MnO 3 in which AE is at least one of Ca and Sr; x satisfies 0<x≤about 0.20; and y satisfies 0<y≤about 0.10.

First claim

What is claimed is:

1. A resistive element comprising:
an element main body; and
at least two electrodes disposed such that at least a portion of the element main body is interposed therebetween; wherein
the element main body is composed of a ceramic material having a composition represented by a formula of:
La 1-x-y AE y MnO 3 ,

in which AE is at least one of Ca and Sr;
x satisfies 0<x≤about 0.20; and
y satisfies 0<y≤about 0.10.

2. The resistive element according to claim 1 , wherein
x satisfies about 0.03≤x≤about 0.20, and
y satisfies about 0.005≤y≤about 0.10.

3. The resistive element according to claim 1 , wherein
(i) x satisfies about 0.03≤x≤about 0.20, and y satisfies about 0.005≤y≤about 0.07; or
(ii) x satisfies about 0.03≤x≤about 0.15, and y satisfies about 0.07<y≤about 0.10.

4. A resistive element comprising:
an element main body; and
at least two electrodes disposed such that at least a portion of the element main body is interposed therebetween; wherein
the element main body is composed of a ceramic material comprising:
a composite oxide of La, AE, and Mn; wherein
AE is at least one of Ca and Sr;
a sum of a molar content of La and a molar content of AE is smaller than about 100 parts by mol and about 80 parts by mol or larger relative to 100 parts by mol of Mn; and
the molar content of AE is larger than about 0 parts by mol and about 10 parts by mol or smaller relative to 100 parts by mol of Mn.

5. The resistive element according to claim 4 , wherein
the sum of the molar content of La and the molar content of AE is about 97 parts by mol or smaller and about 80 parts by mol or larger relative to 100 parts by mol of Mn; and
the molar content of AE is about 0.5 part by mol or larger and about 10 parts by mol or smaller relative to 100 parts by mol of Mn.

6. The resistive element according to claim 4 , wherein
(i) the sum of the molar content of La and the molar content of AE is about 97 parts by mol or smaller and about 80 parts by mol or larger relative to 100 parts by mol of Mn; and
the molar content of AE is about 0.5 part by mol or larger and about 7 parts by mol or smaller relative to 100 parts by mol of Mn; or
(ii) the sum of the molar content of La and the molar content of AE is about 97 parts by mol or smaller and about 85 parts by mol or larger relative to 100 parts by mol of Mn; and
the molar content of AE is larger than about 7 parts by mol and about 10 parts by mol or smaller relative to 100 parts by mol of Mn.

7. The resistive element according to claim 1 , wherein the resistive element is a thermistor element to reduce an inrush current.

8. The resistive element according to claim 4 , wherein the resistive element is a thermistor element to reduce an inrush current.

Assignees

• Murata Manufacturing Co

Inventors

• Hirose Sakyo
• Katsu Hayato

Classifications

• H01C1/1413

  Terminals or electrodes formed on resistive elements having negative temperature coefficient · CPC title

• H01C7/04

  having negative temperature coefficient · CPC title

• C01P2006/40

  Electric properties · CPC title

• C04B35/62625

  Wet mixtures · CPC title

• C01G45/1264 Primary

  containing rare earths, e.g. (La1-xCax)MnO3 or LaMnO3 · CPC title