Patent ID: 8147990

Claim:
A ceramic material with negative temperature coefficient of resistance with the general formula: [{(SE 1 III ,SE 2 III ) 1−x (M 1 II ,M 2 II ) x }(Cr 1−y−z Mn y (Me 1 III ,Me 2 III ) z )O 3 ] wherein (SE 1 III ,SE 2 III ) are rare-earth metal cations and SE 1 III can be equal to SE 2 III or stands for different rare-earth metal cations for mixtures of SE 1 III and SE 2 III , M 1 III can be equal to M 2 II or their mixtures with variable percentages and stands for bivalent metal cations, and Me 1 III and Me 2 III are redox-stable, trivalent metal cations that can be equal or different and the following applies: 0<x<1 0<z≦0.3; 0<y<1−z.