Thermochromic solids
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[1] Royal Melbourne Institute of Technology University
Royal Melbourne Institute of Technology University
Australia
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 75, Nº 1 (January), 1998, págs. 57-57
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Thermochromism is the reversible change of color of a solid when it is heated or cooled. Previous reported examples of thermochromic solids involve color changes due to changes of stereochemistry. Salts of mercuric iodide, M2HgI4 [M=Cu(I), Ag(I)] are easily prepared and exhibit sharp, reversible thermochromic transitions at moderately low temperatures. The Ag(I) solid changes color from yellow to orange at 50 °C and the Cu(I) solid at 67 °C. The color changes are due to subtle changes in crystal structure. Signs can be prepared for lecture demonstrations using pieces of filter paper saturated in the solids
