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Thermochromic composite oxide and method for detecting temperature therewith
| Details |
Inventors: Kuroda, Masanori; Araki, Michio;
Assignee: Japan as represented by Director General of Agency of Industrial Science (Tokyo, JP)
Primary Examiner: Cuchlinski, Jr.; William A.
Assistant Examiner: Gutierrez; Diego F. F.
Attorney, Agent or Firm: Wenderoth, Lind & Ponack
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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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As is described above, the thermochromic substance of the invention is a composite oxide of strontium and manganese having a specific thermochromic characteristic as prepared from specific starting materials in a specific procedure.
Needless to say, a composite oxide of strontium and manganese having a chemical formula of SrMnO.
sub.
3 is old and X-ray crystallographic data are well analyzed for those prepared by the calcination of a powder blend of strontium carbonate and manganese carbonate.
Contrary to the conventional procedure, it is essential in the present invention that the starting materials of the composite oxide are strontium carbonate and manganese dioxide.
Quite unexpectedly, the composite oxide of strontium and manganese prepared by the calcination of a powder blend of strontium carbonate and manganese dioxide exhibits a remarkable thermochromisn at a relatively low thermochromic point even when the crystallographic structure thereof is analogous to that of the conventional composite oxide of SrMnO.
sub.
3 with the molar ratio of Sr to Mn equal to 1:1 as prepared from strontium carbonate and manganese carbonate.
Namely, the inventor has conducted extensive investigations with an object to develop a novel inorganic thermochromic substance having a thermochromic point at a low temperature region and prepared various kinds of composite oxides by the calcination of a powder blend of the starting compounds of the respective constituent elements.
When a composite oxide of strontium and manganese was prepared by the calcination of a powder blend of strontium carbonate and manganese dioxide, instead of conventional manganese carbonate, under specific conditions of calcination, it was unexpectedly discovered that the thus prepared composite oxide of strontium and manganese exhibited a thermochromism having a thermochromic point at a low temperature leading to completion of the present invention while no noticeable thermochromism could be found in the conventional composite oxide of SrMnO
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