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Characterization of nickel doped Zn7Sb2O12 spinel phase using Rietveld refinement

Published online by Cambridge University Press:  06 March 2012

L. Gama,
C. O. Paiva-Santos,
C. Vila,
P. N. Lisboa-Filho and
E. Longo
L. Gama
Affiliation:
Laboratório de Cerâmica, Departamento de Engenharia de Materiais, Centro de Ciências e Tecnologia–Universidade Federal da Paraíba, Campina Grande-PB, Brazil
C. O. Paiva-Santos*
Affiliation:
Laboratório Computacional de Análises Cristalográficas e Cristalinas, Instituto de Química–Universidade Estadual Paulista, Araraquara SP, Brazil
C. Vila
Affiliation:
Laboratório Interdisciplinar de Eletroquímica e Cerâmica, Departamento de Química, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Universidade Federal de São Carlos, São Carlos SP, Brazil
P. N. Lisboa-Filho
Affiliation:
Laboratório Interdisciplinar de Eletroquímica e Cerâmica, Departamento de Química, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Universidade Federal de São Carlos, São Carlos SP, Brazil
E. Longo
Affiliation:
Laboratório Interdisciplinar de Eletroquímica e Cerâmica, Departamento de Química, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Universidade Federal de São Carlos, São Carlos SP, Brazil
*
a)Author to whom correspondence should be addressed; electronic mail: copsanto@iq.unesp.br
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Abstract

Zn7Sb2O12 is known to adopt an inverse spinel crystal structure, in which Zn2+ occupies the eight tetrahedral positions and Sb5+ and Zn2+ randomly occupy the 16 octahedral positions. Samples of Zn7−xNixSb2O12 (x=0, 1, 2, 3, and 4) were synthesized using a modified polymeric precursor method, known as the Pechini method. The crystal structure of the powders was characterized by Rietveld refinement with X-ray diffraction data. The results show that for x=0, 1, and 2 Ni substitutes for Zn2+ in the octahedral sites, and that for x=3 and 4 it is assumed that Ni2+ replaces Zn2+ ions in both the octahedral and tetrahedral positions. It is also observed for x=3 and 4 the formation of two spinel phases.

Keywords

spinel structureX-ray diffractionRietveld methodPechini method

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Type
Technical Articles
Information
Powder Diffraction , Volume 18 , Issue 3 , September 2003, pp. 219 - 223
Copyright
Copyright © Cambridge University Press 2005

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