Structure of the mixed oxides $La_{0.6}Pb_{0.4}Mn_{1-y}Ti_yO_{3\pm z}$ (0 < y < 0.4) via Rietveld refinements

Nalini, G and Sahana, M and Hegde, MS and Row, Guru TN (2001) Structure of the mixed oxides $La_{0.6}Pb_{0.4}Mn_{1-y}Ti_yO_{3\pm z}$ (0 < y < 0.4) via Rietveld refinements. In: Materials Research Bulletin, 36 (1-2). pp. 307-314.

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Abstract

The crystal structure of several compositions in the system $La_{0.6}Pb_{0.4}Mn_{1-y}Ti_yO_3 (0 \leq y \leq 0.4)$ have been investigated by powder X-ray diffraction using the Rietveld refinement technique. The solid solutions of compositions Y = 0.1, 0.2, and 0.3 crystallize in the rhombohedral structure (space group $R\bar{3}c$), while for the composition corresponding to Y = 0.4, the crystal structure transforms from rhombohedral to orthorhombic system (space group Imma). Profile refinements on all these compositions reveal that the $MnO_6$ octahedra are distorted and rotated from their ideal positions. The doping at the B-site results in the formation of the orthorhombic phase Imma at room temperature. The structural implications on the magnetic properties also correlate with previous observations.

Item Type:	Journal Article
Publication:	Materials Research Bulletin
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	A. Oxides;B. Chemical synthesis;C. X-ray diffraction;D. Crystal structure
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	30 Mar 2007
Last Modified:	19 Sep 2010 04:37
URI:	http://eprints.iisc.ac.in/id/eprint/10589

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