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Crystal structure refinement of Co-doped lanthanum chromites

Published online by Cambridge University Press:  06 March 2012

H. P. S. Corrêa
Affiliation:
Instituto de Química, Universidade Estadual Paulista (UNESP), R. Professor Degni s/n, 14800-900 Araraquara, São Paulo, Brazil
C. O. Paiva-Santos
Affiliation:
Instituto de Química, Universidade Estadual Paulista (UNESP), R. Professor Degni s/n, 14800-900 Araraquara, São Paulo, Brazil
L. F. Setz
Affiliation:
Instituto de Pesquisas Energéticas e Nucleares (IPEN), Campus Universidade de São Paulo (USP), 05508-900 São Paulo, São Paulo, Brazil
L. G. Martinez
Affiliation:
Instituto de Pesquisas Energéticas e Nucleares (IPEN), Campus Universidade de São Paulo (USP), 05508-900 São Paulo, São Paulo, Brazil
S. R. H. Mello-Castanho
Affiliation:
Instituto de Pesquisas Energéticas e Nucleares (IPEN), Campus Universidade de São Paulo (USP), 05508-900 São Paulo, São Paulo, Brazil
M. T. D. Orlando
Affiliation:
Departamento de Física e Química, Universidade Federal do Espírito Santo (UFES), Vitória, Espírito Santo, Brazil

Abstract

Results of crystal structure refinements and phase quantification for samples of Co-doped lanthanum chromites with nominal composition LaCr1−xCoxO3, for x=0.00, 0.10, 0.20, and 0.30, prepared by combustion synthesis are presented. The resulting powders were characterized by scanning electron microscopy and X-ray diffraction (XRD). The XRD patterns were obtained with Cu Kα radiation for non-doped lanthanum chromite sample and additionally with Cr Kα radiation for Co-doped lanthanum chromites samples, in order to enhance the signal from scattering. Rietveld analysis of XRD data showed that the studied samples presented the lanthanum chromite with an orthorhombic structure (Pnma), except for the composition with x=0.30, in which the space group was found to be R3c.

Type
Technical Articles
Copyright
Copyright © Cambridge University Press 2008

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