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Press to Success: Gd5FW3O16-The First Gadolinium(III) Fluoride Oxidotungstate(VI)
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). University of Stuttgart, Germany.
Number of Authors: 22019 (English)In: Crystals, ISSN 2073-4352, Vol. 9, no 8, article id 424Article in journal (Refereed) Published
Abstract [en]

The gadolinium(III) fluoride oxidotungstate(VI), with the formula Gd5FW3O16, represents the first published fluoride-derivative of a rare-earth metal oxidotungstate. It is synthesized by a mixture of GdF3, Gd2O3, and WO3 at 800 degrees C and a pressure of 2 GPa with the help of a belt press. The title compound crystallizes in the monoclinic space group P2(1)/c (no. 14) with four formula units per unit cell and the following lattice parameters: a = 539.29 (4), b = 1556.41 (12), c = 1522.66 (11) pm, and beta = 93.452 (4). The crystal structure comprises five crystallographically distinguishable Gd3+ cations, which are surrounded by either oxide and fluoride anions (Gd1-3) or by oxide anions only (Gd4, Gd5), with coordination numbers ranging between seven and nine. The fluoride anions are trigonal non-planar coordinated by three Gd3+ cations (Gd1-3). The distorted [WO6](6-) octahedra in this structure form isolates edge- and vertex-connected entities of the compositions [W2O10](8-) and [W2O11](10-), respectively. According to the presented units, a structured formula can be written as Gd-4[FGd3](2)[W2O10][W2O11](2). The single-crystal Raman spectrum reveals the typical symmetric stretching vibration mode of octahedral oxidotungstate(VI) units at about 871 cm(-1).

Place, publisher, year, edition, pages
2019. Vol. 9, no 8, article id 424
Keywords [en]
high-pressure, gadolinium, fluorine, tungstate, single-crystal Raman
National Category
Chemical Sciences Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-173185DOI: 10.3390/cryst9080424ISI: 000482996000026OAI: oai:DiVA.org:su-173185DiVA, id: diva2:1351958
Available from: 2019-09-17 Created: 2019-09-17 Last updated: 2019-09-17Bibliographically approved

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