| 摘要 |
<p>A thermistor comprises a composition having the general formula (I):
€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ Re 2-x-y Cr a Mn b M c E y O z €ƒ€ƒ€ƒ€ƒ€ƒ(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,
if y‰¥0.006, at (Cr=0.00, Mn=0.99, M=0.01),
point B is, if y<0.006, at (Cr=0.83, Mn=0.10+10·y, M=0.07-10·y), and,
if y‰¥0.006, at (Cr=0.83, Mn=0.16, M=0.01),
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 between 0 and 0.5·x, and
z is a number between 2.5 and 3.5.</p> |
