Method of producing fluorapatite and a moisture sensitive resistor using fluorapatite obtained by the same
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United States of America Patent
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Nov 20, 1990
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app pub date -
Apr 12, 1989
filing date -
Apr 15, 1987
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Abstract
A method of producing fluorapatite wherein predetermined amounts of calcium monohydrogen phosphate, calcium carbonate, and calcium fluoride are weighed, subjected to a mechanochemical action, and caused to react with one another in water. With this method, a fluorapatite having a uniform composition can be obtained without the accompaniment of by-products. A moisture sensitive resistor of the present invention can be obtained by sintering the fluorapatite produced in accordance with this method. This moisture sensitive resistor has a sufficiently low resistance corresponding to a humidity, and has substantially no hysteresis.
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