New triple molybdate and tungstate Na 5 Rb 7 Sc 2 ( X O 4 ) 9  ( X  = Mo, W)

Tatyana S. Spiridonova; Aleksandra A. Savina; Evgeniy V. Kovtunets; Elena G. Khaikina

doi:10.15826/chimtech.2021.8.4.12

New triple molybdate and tungstate Na₅Rb₇Sc₂(XO₄)₉ (X = Mo, W)

Tatyana S. Spiridonova, Aleksandra A. Savina, Evgeniy V. Kovtunets, Elena G. Khaikina

Abstract

New compounds of the composition Na₅Rb₇Sc₂(XO₄)₉ (X = Mo, W) were obtained via the ceramic technology. The sequences of chemical transformations occurring during the formation of these compounds were established, and their primary characterization was performed. Both Na₅Rb₇Sc₂(XO₄)₉ (X = Mo, W) were found to melt incongruently at 857 K (X = Mo) and 889 K (X = W). They are isostructural to Ag₅Rb₇Sc₂(XO₄)₉ (X = Mo, W), Na₅Cs₇Ln₂(MoO₄)₉ (Ln = Tm, Yb, Lu) and crystallize in the trigonal crystal system (sp. gr. R32). The crystal structures were refined with the Rietveld method using the powder X-ray diffraction data. The thermal expansion of Na₅Rb₇Sc₂(WO₄)₉ was studied by high-temperature powder X-ray diffraction; it was shown that this triple tungstate belongs to high thermal expansion materials.

Keywords

sodium; rubidium; scandium; triple molybdate; triple tungstate; synthesis; crystal structure; thermal expansion

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References

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DOI: https://doi.org/10.15826/chimtech.2021.8.4.12

Copyright (c) 2021 Tatyana S. Spiridonova, Aleksandra A. Savina, Evgeniy V. Kovtunets, Elena G. Khaikina