INVESTIGADORES
LOPEZ Carlos Alberto
artículos
Título:
B SITE CATIONIC PARTIAL SUBSTITUTION BY La3+ DOPING IN THE Sr2CoWO6 DOUBLE PEROVSKITE: A XRPD STRUCTURAL STUDY
Autor/es:
CARLOS A. LÓPEZ; MARIA DEL C. VIOLA; JOSÉ C. PEDREGOSA
Revista:
Journal of the Argentine Chemical Society
Editorial:
ASOCIACIÓN QUÍMICA ARGENTINA
Referencias:
Lugar: Buenos Aires; Año: 2009 vol. 97 p. 226 - 233
ISSN:
0365-0375
Resumen:
La-doped Sr2CoWO6 double perovskites have been prepared in air in polycrystalline form by solid state reaction at 1300 ºC. The structure of these materials with Sr2-xLaxCoW1-x/4Cox/4O6 stoichiometry where x = 0.4, 0.8, 1.2 and 1.6, has been studied by X-ray diffraction (XRPD) applying Rietveld method. The replacement of Sr2+ by La3+ induces a change of the tetragonal structure, space group I4/m of the undoped Sr2CoWO6 into the distorted monoclinic crystal structure, space group P21/n, Z = 2. The structure of La-doped phases contains alternating CoO6 and (Co/W)O6 octahedra, almost fully ordered.
