Structural determination of new solid solutions [Y2-xMx][Sn2-xMx]o7-3x/2 (M = Mg or Zn) by Rietveld method | Zendy

Mohamed Douma | Zendy; Hossain El | Zendy; Raquel Trujillano | Zendy; V. Rives | Zendy

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Structural determination of new solid solutions [Y2-xMx][Sn2-xMx]o7-3x/2 (M = Mg or Zn) by Rietveld method

Author(s) -

Mohamed Douma,

Hossain El,

Raquel Trujillano,

V. Rives

Publication year - 2010

Publication title -

processing and application of ceramics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.326

H-Index - 15

eISSN - 2406-1034

pISSN - 1820-6131

DOI - 10.2298/pac1004237d

Subject(s) - solid solution , pyrochlore , materials science , rietveld refinement , powder diffraction , crystallography , stoichiometry , solid state , crystal structure , lattice constant , analytical chemistry (journal) , diffraction , chemistry , physics , metallurgy , phase (matter) , optics , organic chemistry , chromatography

New [Y 2-x M x ][Sn 2-x M x ]O 7-3x/2 (0 ≤x≤ 0.30 for M = Mg and 0 ≤x≤ 0.36 for M = Zn) solid solutions with the pyrochlore structure were synthesized via high-temperature solid-state reaction method. Powder X-ray diffraction (PXRD) patterns and Fourier transform infrared (FT-IR) spectra showed that these materials are new non-stoichiometric solid solutions with the pyrochlore type structure. The structural parameters for the solids obtained were successfully determined by Rietveld refinement based on the analysis of the PXRD diagrams. Lattice parameter (a) of these solid solutions decreases when x increases in both series. All samples obtained have the pyrochlore structure Fd-3m, no. 227 (origin at center -3m) with M 2+ (M = Mg 2+ or Zn 2+ ) cations in Y 3+ and Sn 4+ sites, thus creating vacancies in the anionic sublattice.

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