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Thermoanalytical study of the polymorphism and melting behavior of Cu2V2O7

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Abstract

We have developed a procedure for the synthesis of phase-pure α- and β-Cu2V2O7. Thermal analysis and X-ray diffraction demonstrate that the β-phase (monoclinic structure) exists at low temperatures (stability range 25–610°C), while α-Cu2V2O7 (orthorhombic structure) is stable in the range 610–704°C. The α-phase observed during cooling, in particular at room temperature, is in a metastable state. The melting of the high-temperature phase γ-Cu2V2O7, which forms between 704 and 716°C, has the highest rate in the range 770–785°S and is accompanied by peritectic decomposition and oxygen gas release. Subsequent cooling gives rise to four exothermic peaks, one of which (780.9°C) is attributable to the crystallization of the peritectic melt, one (620.1°C) is due to the γ → α → β phase transformations of Cu2V2O7, and the other two arise from the crystallization of multicomponent low-melting-point eutectics containing α- and β-Cu2V2O7, CuVO3, and other compounds.

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  1. Institute of Solid State Chemistry, Ural Division, Russian Academy of Sciences, Pervomaiskaya ul. 91, Yekaterinburg, 620041, Russia

    B. V. Slobodin & R. F. Samigullina

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  1. B. V. Slobodin
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  2. R. F. Samigullina
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Correspondence to B. V. Slobodin.

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Original Russian Text © B.V. Slobodin, R.F. Samigullina, 2010, published in Neorganicheskie Materialy, 2010, Vol. 46, No. 2, pp. 236–241.

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Slobodin, B.V., Samigullina, R.F. Thermoanalytical study of the polymorphism and melting behavior of Cu2V2O7 . Inorg Mater 46, 196–200 (2010). https://doi.org/10.1134/S0020168510020196

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