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Article Dans Une Revue Inorganic Chemistry Année : 2014

Thermochromism in Yttrium Iron Garnet Compounds

Résumé

Polycrystalline yttrium iron garnets (Y 3 Fe 5 O 12) were synthesized by solid-state reaction and characterized by X-ray diffraction, Mössbauer spectroscopy and UV-vis-NIR diffuse reflectance spectroscopy. The green color of the compounds have been assigned to the presence of a O 2-Fe 3+ ligand-to-metal charge transfer together with d-d transitions, the absence of Fe 2+ in samples being verified with Mössbauer measurements. By increasing the temperature to around 300°C, the YIG material shows a thermochromic behavior with a continuous color change from greenish to brownish due to a red-shift of the ligand-to-metal charge transfer. Y 3 Fe 5 O 12 host lattice was also doped with chromium ions and the same red-shift phenomenon was observed although the effect on the crystal structure is opposite. Indeed, Cr 3+ ions were proved to play a major role on the color either by an inductive effect or, more probably, by a direct effect on the electronic structure of the material as discussed in this work. 2
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Dates et versions

hal-02572089 , version 1 (13-05-2020)

Identifiants

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Hélène Sérier-Brault, Lucile Thibault, Magalie Legrain, Philippe Deniard, Xavier Rocquefelte, et al.. Thermochromism in Yttrium Iron Garnet Compounds. Inorganic Chemistry, 2014, 53 (23), pp.12378-12383. ⟨10.1021/ic501708b⟩. ⟨hal-02572089⟩
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