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    The structure of the metastable K18Ta5Zr5F63 phase / M. Boca, M. Molokeev, A. Rakhmatullin [et al.] // New J. Chem. - 2020. - Vol. 44, Is. 22. - P. 9264-9270, DOI 10.1039/d0nj02428g. - Cited References: 30. - Financial support from TGIR-RMN-THC Fr3050 CNRS for conducting the research is gratefully acknowledged. This work was supported by the Slovak Research and Development Agency under the contract no. APVV-15-0479. This work was financially supported by the Scientific Grant Agency of the Ministry of Education of the Slovak Republic and the Slovak Academy of Sciences, grant no. Vega 2/0024/20 . - ISSN 1144-0546
   Перевод заглавия: Струкрута метастабильной фазы K18Ta5Zr5F63
Кл.слова (ненормированные):
Fluorine compounds -- Geometry -- Nuclear magnetic resonance spectroscopy -- Prisms
Аннотация: A metastable phase K18Ta5Zr5F63 was prepared by molten salt synthesis of K2TaF7 and K2ZrF6 in a sealed Pt crucible. This is the first example of a structure of a fluoride complex compound containing both tantalum and zirconium as central atoms. The asymmetric part of the unit cell contains two Ta/Zr sites and one pure Zr site. The Ta1/Zr1 ion is coordinated by seven F ions forming one capped trigonal prism. The Ta2/Zr2 ion is coordinated by six F ions forming a trigonal prism, and this polyhedron is fully ordered. The Zr3 ion is coordinated by six F ions, which are disordered over two positions. All (Zr/Ta)Fn (n = 6–8) polyhedra are isolated from each other, although the ZrF6 units have shared faces, forming an infinite channel along the c-axis. 19F MAS NMR experiments agree with the proposed structural model, identifying all five central non-equivalent polyhedra. The K18Ta5Zr5F63 phase decomposes within several months to its initial components; this can be monitored by NMR, DSC and XRD experiments. Moreover, accelerated decomposition can be achieved by thermal treatment, resulting in the formation of a K3ZrF7 phase.

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Держатели документа:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, SK-845 36, Slovakia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50 bld. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Conditions Extremes et Materiaux, Haute Temperature et Irradiation, 1D avenue de la Recherche Scientifique CS 90055, Orleans Cedex 2, 45071, France

Доп.точки доступа:
Boca, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Rakhmatullin, A.; Kubikova, B.; Netriova, Z.
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