Thermochromic Properties of Some Colored Oxide Materials
Propriétés thermochromiques de quelques matériaux oxydes colorés
Résumé
The thermochromic properties up to 500°C of some colored, commercial and non-toxic oxides were studied. It includes Bi 2 O 3 , Fe 2 O 3 , In 2 O 3 , WO 3 , Er 2 O 3 , YAG:Ce (Ce doped yttrium aluminum garnet Y 3 Al 5 O 12) and YInMn-Blue (Mn doped yttrium indium oxide YInO 3). From the CIELAB colorimetric parameters (L*a*b*), evolution of the color contrast ΔE with temperature was calculated. It allowed estimating that most of these oxides change color reversibly with increasing temperature. Two exceptions were identified: i) Er 2 O 3 which stayed almost identically pink on all the temperature range and ii) WO 3 which original color was not recovered upon cooling back to room temperature. While the color change of the other oxides was gradual with increasing temperature, YAG:Ce compound behaved differently since its thermochromicity abruptly started above 300°C. The obtained datasets for all these compounds can be used for anticipating the thermochromic properties of these powders and the blends made out of them.
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