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Effect of Cr doping on the structure of (Pr0.55Ca0.45)(Mn1−yCry)O3: A Rietveld refinement study

Published online by Cambridge University Press:  06 March 2012

A. Martinelli,
M. Ferretti and
C. Castellano
A. Martinelli*
Affiliation:
INFM-LAMIA, C.so Perrone 24, I-16152 Genova, Italy
M. Ferretti
Affiliation:
Dipartimento Chimica e Chimica Industriale and INFM-LAMIA, Via Dodecaneso 31, I-16146 Genova, Italy
C. Castellano
Affiliation:
Università di Roma “La Sapienza,” Dipartimento di Fisica and INFM, P.le A. Moro 2, 00185 Roma, Italy
*
a)Author to whom correspondence should be addressed; Electronic mail: amartin@chimica.unige.it
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Abstract

(Pr0.55Ca0.45)(Mn1−yCry)O3 (with y=0.00, 0.03, and 0.06) have been prepared by means of a solid state reaction from stoichiometric powder mixtures of binary oxides. X-ray powder diffraction analysis reveals the formation of the perovskite-type compound for the whole considered compositions; no evidence for secondary phases may be detected. The structural refinements have been carried out using X-ray powder diffraction data applying the Rietveld method; the lattice parameters of the orthorhombic cell faintly change with composition. On the contrary the tilting of the octahedra results are strongly dependent on the concentration of Cr in the 4b site. Bond valence sum method has been applied in order to evaluate the possible presence of lattice-induced strains and the amount of Mn4+. Structural data are also reported.

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Type
Technical Articles
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Powder Diffraction , Volume 19 , Issue 2 , June 2004, pp. 137 - 140
Copyright
Copyright © Cambridge University Press 2004

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