Mixed-metal phosphates K 1.64 Na 0.36 TiFe(PO 4 ) 3 and K 0.97 Na 1.03 Ti 1.26 Fe 0.74 (PO 4 ) 3 with a langbeinite framework.

Autor: Zatovsky IV; F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS Ukraine, 42 Acad. Vernadskoho blv., 03142 Kyiv, Ukraine., Strutynska NY; Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., 01601 Kyiv, Ukraine., Ogorodnyk IV; ShimUkraine LLC 18, Chigorina Str., office 429, 01042 Kyiv, Ukraine., Baumer VN; STC 'Institute for Single Crystals', NAS of Ukraine, 60 Lenin ave., 61001 Kharkiv, Ukraine., Slobodyanik NS; Department of Inorganic Chemistry, Taras Shevchenko National University of Kyiv, 64/13, Volodymyrska Str., 01601 Kyiv, Ukraine., Butenko DS; Shenzhen Key Laboratory of Solid State Batteries, Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China.; Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Southern University of Science and Technology, Shenzhen 518055, People's Republic of China.
Jazyk: angličtina
Zdroj: Acta crystallographica. Section E, Crystallographic communications [Acta Crystallogr E Crystallogr Commun] 2021 Nov 16; Vol. 77 (Pt 12), pp. 1299-1302. Date of Electronic Publication: 2021 Nov 16 (Print Publication: 2021).
DOI: 10.1107/S2056989021011877
Abstrakt: Single crystals of the langbeinite-type phosphates K 1.65 Na 0.35 TiFe(PO 4 ) 3 and K 0.97 Na 1.03 Ti 1.26 Fe 0.74 (PO 4 ) 3 were grown by crystallization from high-temperature self-fluxes in the system Na 2 O-K 2 O-P 2 O 5 -TiO 2 -Fe 2 O 3 using fixed molar ratios of (Na+K):P = 1.0, Ti:P = 0.20 and Na:K = 1.0 or 2.0 over the temperature range 1273-953 K. The three-dimensional framework of the two isotypic phosphates are built up from [(Ti/Fe) 2 (PO 4 ) 3 ] structure units containing two mixed [(Ti/Fe)O 6 ] octa-hedra (site symmetry 3) connected via three bridging PO 4 tetra-hedra. The potassium and sodium cations share two different sites in the structure that are located in the cavities of the framework. One of these sites has nine and the other twelve surrounding O atoms.
(© Zatovsky et al. 2021.)
Databáze: MEDLINE
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