| 摘要 |
PURPOSE:To obtain a reversible heat-sensitive material comprising a Bi2O3-V2O5 polycrystalline material which changes in color tint reversibly accompanying a change in temp., is thermally stable, inexpensive and nontoxic, by calcining a mixture of a Bi compd. with V2O5 at a specific temp., followed by cooling. CONSTITUTION:An oxide, nitrate or chloride of bismuth (e.g.; Bi2O3) is mixed with vanadium pentoxide in such an amount as will provide a Bi/V atomic ration in the range of 0.97/0.03-0.5/0.5. The mixture is pre-calcined and calcined at a temp. of 500-750 deg.C. The product is left to stand for cooling or gradually cooled to obtain a reversible heat-sensitive material comprising a bismuth oxide- vanadium oxide polycrystalline material. The reversible heat-sensitive material exhibits changes in color from a yellow tone to a red tone when heated at a temp. of about 120 deg.C or above and exhibits an allowable maximum temp. of about 750 deg.C. The material is suited for use in temp. displays for heating areas of heating apparatuses.
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