Patent ID: 8362869
Filing Date: 2013-01-29
Classification: C04B,H01C,Y10T

Abstract:
1. A thermistor based on a composition having the general formula (I): wherein Re is a rare earth metal or a mixture of two or more rare earth metals, M is a metal selected from the group consisting of nickel, cobalt, copper, magnesium and mixtures thereof, E is a metal selected from the group consisting of calcium, strontium, barium and mixtures thereof, x is the sum of a+b+c and is a number between 0.1 and 1, and the relative ratio of the molar fractions a, b and c is in an area bounded by points A, B, C and D in a ternary diagram, wherein point A is, if y<0.006, at (Cr=0.00, Mn=0.93+10−y, M=0.07-10−y), and, point B is, if y<0.006, at (Cr=0.83, Mn=0.10+10−y, M=0.07-10−y), and, point C is at (Cr=0.50, Mn=0.10, M=0.40) and point D is at (Cr=0.00, Mn=0.51, M=0.49), y is a number from 0 to 0.5x, and z is a number from 2.5 to 3.5.