Abstract
Reinvestigation of the V2O5–SrO system allowed final confirmation of formation of four compounds of the following stoichiometric formulas: Sr(VO3)2, Sr2V2O7, Sr3(VO4)2 and Sr4V2O9. The results presented permitted solving literature controversies regarding low- and high-temperature polymorphs of strontium metavanadate(V), i.e. Sr(VO3)2-I and Sr(VO3)2-II. The polymorphic transformation of both varieties that crystallize in the orthorhombic system was proved to be reversible and take place at 530 °C. Strontium metavanadate(V) was found to melt incongruently at 670 °C with deposition of solid Sr2V2O7. Both polymorphic forms of Sr(VO3)2 were studied by IR and SEM methods. According to the results of tests using the UV-Vis-DRS method, both polymorphs Sr(VO3)2 belong to the semiconductor class. Thermal stabilities of Sr2V2O7, Sr3(VO4)2 and Sr4V2O9 were verified. The powder diffractogram of Sr4V2O9 was indexed.
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The study was co-financed by a subsidy for the research activity of the Ministry of Education and Science in Poland for the Faculty of Chemical Technology and Engineering of West Pomeranian University of Technology, Szczecin; Grant No. 503-10-085-13/4.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Anna Blonska-Tabero, Elzbieta Filipek, Monika Bosacka and Agnieszka Prokop. The first draft of the manuscript was written by Anna Blonska-Tabero and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Blonska-Tabero, A., Filipek, E., Bosacka, M. et al. Reinvestigation of thermal and other properties of compounds from the V2O5–SrO system. J Therm Anal Calorim 147, 9903–9911 (2022). https://doi.org/10.1007/s10973-022-11363-y
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DOI: https://doi.org/10.1007/s10973-022-11363-y