Thermochromic composite oxide and method for detecting temperatu

Details Thermochromic composite oxide and method for detecting temperatu Thermochromic composite oxide and method for detecting temperatu

1991-09-16

1992-11-24

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

Nonelectrical, nonmagnetic, or nonmechanical temperature...

116216, 252962, 2524081, G01K 1114, C09K 300, C09K 500

Patent

active

051657970

ABSTRACT:
An inorganic thermochromic substance is proposed which is a composite oxide of strontium and manganese in a specified molar ratio as prepared by the calcination of a powder blend of strontium carbonate and manganese dioxide, instead of conventional manganese carbonate, at a specified temperature for a specified length of time. The temperature of the thermochromic color change is about -130.degree. C., much lower than the color-change point of most of conventional thermochromic substances. The color of the composite oxide is grey or pale green at room temperature but reversibly changes to pale red when it is chilled to -130.degree. C. or lower.

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Day, Jesse H., "Thermochromism of Inorganic Compounds," Chemical Reviews, pp. 649-657 (Nov. 25, 1968).

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