Crystal structures and phase transitions in Sr doped Ba2InTaO6 perovskites
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Date
2013-10-01
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Academic Press INC Elsevier Science
Abstract
The crystal structures of the double perovskites of the type Ba2-xSrxInTaO6 have been studied by synchrotron X-ray and neutron powder diffraction methods. The structures are based on ordered array of the tilted InO6 and TaO6 octahedra, with the Ba/Sr cations being completely disordered. The structure evolves from cubic to monoclinic Fm (3) over barm(x similar to 0) (6)-> I4/m(x similar to 1.2)-> I2/m(x similar to 1.6)-> P2(1)/n. The changes in the symmetry induced by replacing the Ba with Sr have been identified by a symmetry-mode analysis. Variable temperature S-XRD studies of selected examples have shown that heating the samples induces the same sequence of transitions observed in the composition dependent studies. © 2013, Elsevier Ltd.
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Keywords
Crystals, Crystal structure, Neutrons, Neutron diffraction, Perovskite, Phase transformations
Citation
Zhou, Q. D., Tan, T. Y., Kennedy, B. J., & Hester, J. R. (2013). Crystal structures and phase transitions in Sr doped Ba2InTaO6 perovskites. Journal of Solid State Chemistry, 206, 122-128. doi:10.1016/j.jssc.2013.08.007