| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 177163 | Dyes and Pigments | 2011 | 8 Pages |
Irreversible thermochromism over a wide temperature range has been observed from the decomposition of a mixture of a barium carbonate and a metal oxide. The control of the reaction temperature can be predicted from the calculation of the Madelung energy of the barium/transition metal mixed oxide formed consecutively with the decarbonatation. Moreover, the Madelung energy of this formed mixed oxide may be predicted from bond valence considerations. This study offers a simple predictive approach to propose temperature indicators with significant optical contrast and a thermochromic temperature varying between 400 and 1200 °C.
► Thermochromic mixtures of carbonates/oxides are obtained. ► The mixtures allow marking the T° range 400 °C–1200 °C. ► The thermochromic T° is predicted from mixture composition/bond valence theory.
