A powder diffraction study of MIBaIn2(PO4)3 (MI=Na, K, Cs) with a langbeinite-type structure

Autor:	M. Liégeois-Duyckaerts, Daniel Louër, André Rulmont, V. Moise
Rok vydání:	2002
Předmět:	Langbeinite Radiation Materials science Rietveld refinement Analytical chemistry General Materials Science Type (model theory) Isostructural Condensed Matter Physics Instrumentation Powder diffraction Monochromatic radiation Ion
Zdroj:	Powder Diffraction. 17:1-6
ISSN:	1945-7413 0885-7156
DOI:	10.1154/1.1407250
Popis:	Three phosphates, MIBaIn2(PO4)3 with MI=Na, K, Cs, isostructural to the langbeinite structure, have been studied from powder diffraction data collected with monochromatic radiation obtained from a conventional X-ray source. Precise powder data are reported, as well as cell parameters, i.e., a=10.026 08(9) Å, a=10.121 57(13) Å and a=10.226 94(9) Å for MI=Na, K and Cs, respectively. A Rietveld refinement has been carried out (space group P213), with final RF factors, 0.061, 0.041 and 0.027, and Rwp factors, 0.196, 0.142 and 0.129, for MI=Na, K and Cs, respectively. There are two octahedrally coordinated In3+ ions in the asymmetric unit and the final refinements suggest disorder on the two sites of the MI/Ba sublattice.
Databáze:	OpenAIRE
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