Synthesis and structural characterization of new defect pyrochlore type A{sub x}Ln{sub y}Sb{sub 2}O{sub 6+z} antimoniates (0<x, y, z<1; A = Rb, Cs, Tl; Ln = Eu, Gd, and Y) prepared by coprecipitation

Journal Article · Mon Jul 14 00:00:00 EDT 2003 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(03)00131-4· OSTI ID:20887994

El Haimouti, A; Zambon, D; El-Ghozzi, M; Avignant, D; Leroux, F; El Aatmani, M; Daoud, M

New cubic defect pyrochlore type A{sub x}Ln{sub y}Sb{sub 2}O{sub 6+z} antimoniates (0<x,y,z<1; A=Rb, Cs, Tl; Ln=Eu, Gd, and Y) (space group Fd3m) were prepared by calcination in air at 650 deg. C of compositions obtained by a coprecipitation method. Their crystal structures were refined by the Rietveld procedure and further confirmed by X-ray absorption spectroscopy (EXAFS) experiments. Refinements of the X-ray powder diffraction data show a partial and statistical occupation of the 8b site by alkaline or thallous ions and oxygen and lead to values close to 0.33 for the only refinable positional x parameter of the 48f oxygenated site.

• OSTI ID: 20887994
• Journal Information: Materials Research Bulletin, Vol. 38, Issue 8; Other Information: DOI: 10.1016/S0025-5408(03)00131-4; PII: S0025540803001314; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ANTIMONATES
CALCINATION
CHEMICAL PREPARATION
COPRECIPITATION
CUBIC LATTICES
DEFECTS
FINE STRUCTURE
PYROCHLORE
SPACE GROUPS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY