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• W1995536657 abstract "Polycrystalline yttrium iron garnet (Y3Fe5O12, hereafter labeled YIG) has been synthesized by solid-state reaction, characterized by X-ray diffraction, Mössbauer spectroscopy, and UV–vis-NIR diffuse reflectance spectroscopy, and its optical properties from room temperature (RT) to 300 °C are discussed. Namely, its greenish color at RT is assigned to an O2– → Fe3+ ligand-to-metal charge transfer at 2.57 eV coupled with d–d transitions peaking at 1.35 and 2.04 eV. When the temperature is raised, YIG displays a marked thermochromic effect; i.e., the color changes continuously from greenish to brownish, which offers opportunities for potential application as a temperature indicator for everyday uses. The origin of the observed thermochromism is assigned to a gradual red shift of the ligand-to-metal charge transfer with temperature while the positioning in energy of the d–d transitions is almost unaltered. Attempts to achieve more saturated colors via doping (e.g., Al3+, Ga3+, Mn3+, ...) remained unsuccessful except for chromium. Indeed, Y3Fe5O12:Cr samples exhibit at RT the same color than the undoped garnet at 200 °C. The introduction of Cr3+ ions strongly impacts the color of the Y3Fe5O12 parent either by an inductive effect or, more probably, by a direct effect on the electronic structure of the undoped material with formation of a midgap state." @default.
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• W1995536657 date "2014-11-10" @default.
• W1995536657 modified "2023-10-06" @default.
• W1995536657 title "Thermochromism in Yttrium Iron Garnet Compounds" @default.
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• W1995536657 doi "https://doi.org/10.1021/ic501708b" @default.
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