Polymorphism in yttrium molybdate Y2Mo3O12 |
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Authors: | Stacy D Gates Cora Lind |
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Institution: | aDepartment of Chemistry, The University of Toledo, Toledo, OH 43606, USA |
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Abstract: | Yttrium molybdate (Y2Mo3O12) has been prepared by non-hydrolytic sol–gel chemistry. The phase evolution upon heating was investigated using in situ and ex situ heat treatments combined with powder X-ray diffraction. This method has led to the isolation of two orthorhombic phases with different atomic connectivity. Yttrium adopts 6- and 7-coordinate sites in the Pbcn and Pba2 structures, respectively. Cocrystallization of both phases was observed in a narrow temperature range, suggesting that crystallization kinetics play a major role in phase formation. It was found that the Pba2 phase is the stable polymorph below 550 °C, and converts to Pbcn at higher temperatures. |
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Keywords: | Yttrium molybdate Y2Mo3O12 Polymorphism Stability X-ray diffraction Rietveld |
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