Issue 8, 2014

Crystallographic site swapping of La3+ ion in BaA′LaTeO6 (A′ = Na, K, Rb) double perovskite type compounds: diffraction and photoluminescence evidence for the site swapping

Abstract

Double perovskite type compounds of the formula BaA′LaTeO6 (A′ = Na, K, Rb) were synthesized by solid state route and their crystal structures were determined by Rietveld analysis using powder X-ray diffraction and neutron diffraction data. Na compound crystallizes in the monoclinic system with P21/n space group whereas, K and Rb compounds crystallize in Fm[3 with combining macron]m space group. All the three compounds show rock salt type ordering at B site. Crystal structure analysis shows that La ion occupies A site in Na compound whereas, it occupies B site in K and Rb compounds according to the general formula of AA′BB′O6 for a double perovskite type compound. Effect of this crystallographic site swapping of the La ion was also observed in the photoluminescence study by doping Eu3+ in La3+ site. The large decrease in the intensity of the electric dipole (5D07F2) transition in the Rb compound compared to the Na compound indicates that Eu3+ ion resides in the centrosymmetric octahedral environment in the Rb compound.

Graphical abstract: Crystallographic site swapping of La3+ ion in BaA′LaTeO6 (A′ = Na, K, Rb) double perovskite type compounds: diffraction and photoluminescence evidence for the site swapping

Supplementary files

Article information

Article type
Paper
Submitted
26 Jul 2013
Accepted
03 Nov 2013
First published
08 Nov 2013

Dalton Trans., 2014,43, 3306-3312

Crystallographic site swapping of La3+ ion in BaA′LaTeO6 (A′ = Na, K, Rb) double perovskite type compounds: diffraction and photoluminescence evidence for the site swapping

R. Phatak, S. K. Gupta, K. Krishnan, S. K. Sali, S. V. Godbole and A. Das, Dalton Trans., 2014, 43, 3306 DOI: 10.1039/C3DT52032C

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