ChemInform Abstract: Thermochromism in Yttrium Iron Garnet Compounds.

Abstract

Thermochromism in Yttrium Iron Garnet Compounds. -The compounds Y 3Fe5O12 and Y3Fe5-xCrxO12 are synthesized by solid state reaction of stoichiometric mixtures of Y 2O3, Fe2O3, and Cr2O3 (air, 1350 C, 6 h). The samples are characterized by XRD, Moessbauer spectroscopy, and UV/VIS/NIR diffuse reflectance spectroscopy. With increasing temperature, the color of Y3Fe5O12 changes continuously from a greenish to a brownish tone. Chromium doping tends to simulate the effect of temperature increase with regular red shift with increasing Cr 3+ content. The thermochromism of Y3Fe5O12 offers opportunities for potential application as a temperature indicator for everyday uses. -(SERIER-BRAULT*, H.; THIBAULT, L.; LEGRAIN, M.; DENIARD, P.; ROCQUEFELTE, X.; LEONE, P.; PERILLON, J.-L.; LE BRIS, S.; WAKU, J.; JOBIC, S.; Inorg.