Ceramic material, method for the manufacture of a ceramic material and electroceramic component comprising the ceramic material
Ceramic material of the general formula: [SE 1-x M II x ][Cr 1-y-z R y L z ]O 3 , wherein SE stands for one or more rare earth metals, M II stands for one or more metals of the oxidation state +II, L stands for Al and/or Ga, R stands for one or more metals selected from Fe, Zn, Ge, Sn, and it holds that: 0<x<1; 0<y<1; 0.5<z<1; y+z<1.
1. A ceramic material of the general formula:
[Se 1-x M II x ][Cr 1-y-z R y L z ]O 3
wherein SE stands for one or more rare earth metals, M II stands for one or more metals of the oxidation state +II, L stands for Al and/or Ga, R stands for one or more metals selected from Fe, Zn, Ge, Sn, and 0<x<1; 0<y<0.5; 0.5<z<0.9; further wherein 0.1<1−y−z<0.2.
2. The ceramic material according to claim 1 , wherein SE stands for one or more elements selected from: Y, Ce, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu.
3. The ceramic material according to claim 1 , wherein M II stands for one or more elements selected from the group consisting of Mg, Ca, Sr, and Ba.
4. The ceramic material according to claim 1 , wherein R stands for Fe, or a combination of metals that comprises Fe.
5. The ceramic material according to claim 1 , wherein R stands for Zn, or a combination of metals that comprises Zn.
6. The ceramic material according to claim 1 , wherein R stands for Ge, or a combination of metals that comprises Ge.
7. The ceramic material according to claim 1 , wherein R stands for Sn, or a combination of metals that comprises Sn.
8. The ceramic material according to claim 1 , wherein x is: 0.03≦x≦0.5.
9. The ceramic material according to claim 1 , formed as a phase-homogeneous perovskite solid-solution system of the general formula ABO 3 .
10. The ceramic material according to claim 1 , wherein the ceramic material has a negative temperature coefficient.
11. A method for the manufacture of a ceramic material comprising the steps of:
A) mixing the following compounds: SE 2 O 3 , M II CO 3 , Cr 2 O 3 , L 2 O 3 and an oxide of R, so that a mixture is obtained,
B) sintering the mixture produced under A) to form a ceramic material according to claim 1 .
12. An electroceramic component comprising a ceramic material according to claim 1 .
13. The electroceramic component according to claim 12 , comprising:
a ceramic base body containing the ceramic material, and,
two electrically conductive contact areas arranged on the surface of the ceramic base body.