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Studies on n = 2 Aurivillius phases: structure of the series $Bi_{3-x}La_xTiNbO_9$ (0 ≤ x ≤ 1)

Nalini, G and Subbanna, GN and Row, Guru TN (2003) Studies on n = 2 Aurivillius phases: structure of the series $Bi_{3-x}La_xTiNbO_9$ (0 ≤ x ≤ 1). In: Materials Chemistry and Physics, 82 (3). pp. 663-671.

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Abstract

The crystal structures of the solid solutions of $Bi_{3-x}La_xTiNbO_9$ (0 ≤ x ≤ 1) have been analyzed by powder X-ray diffraction with supporting evidence from selected area electron diffraction (SAD). The structure of the starting member (x = 0) is verified to be in the orthorhombic space group $A2_1am$ while the end member (x = 1) is determined to crystallize in the centrosymmetric orthorhombic space group Pmcb. The structure of x = 1 phase is solved by ab initio powder diffraction. The intermediate compositions belong to the space group $A2_1am$ as confirmed by Rietveld refinements. Rietveld refinements on all the compositions reveal that the $La^{3+}$ ion is disordered only in the A site and not in the $[Bi_2O_2]^{2+}$ layer. The tilt in the $Ti/NbO_6$ octahedra decreases with increasing x.

Item Type: Journal Article
Additional Information: The Copyright belongs to Elsevier.
Keywords: Crystal structure;Oxides;X-ray diffraction;Electron diffraction;Ferroelectricity
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 25 Apr 2006
Last Modified: 19 Sep 2010 04:25
URI: http://eprints.iisc.ernet.in/id/eprint/6445

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