Abstract
Powder α-VOSO4 was prepared by dehydration of VOSO4·3H2O. β-VOSO4 was synthesized by boiling of V2O5 in H2SO4. Thermal behaviour of VOSO4·3H2O, α- and β-VOSO4 modifications is studied by high-temperature powder X-ray diffraction and thermal analysis, including two-step dehydration of VOSO4·3H2O, formation of α-VOSO4, thermal expansion and decomposition of both modifications into V2O5. Higher anisotropy of thermal expansion of the tetragonal α-modification αc = 39(2)·10–6 K–1 along the vanadyl ion and αa = 2.4(6)·10–6 K–1 in the perpendicular direction) comparing to the orthorhombic β-modification (αa = 20.2(7), αb = 2.8(8), αc = 17.8(4)·10–6 K–1) is explained from a crystal chemical point of view.
Acknowledgments
The study has been supported by the Russian Foundation for Basic Research (project 13-05-00684). The XRD studies have been performed at the X-ray Diffraction Centre of St. Petersburg State University.
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