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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/1911

Title: Structures and crystal chemistry of the double perovskites Ba(2)LnB'O6 (Ln = lanthanide B'=Nb5+ and Ta5+), Part I - investigation of Ba(2)LnTaO(6) using synchrotron x-ray and neutron powder diffraction.
Authors: Saines, PJ
Spencer, JR
Kennedy, BJ
Avdeev, M
Keywords: Perovskites
Phase Transformations
X-Ray Diffraction
Neutron Diffraction
Rare Earths
Synchrotrons
Issue Date: Nov-2007
Publisher: Elsevier
Citation: Saines, P. J., Spencer, J. R., Kennedy, B. J., & Avdeev, M. (2007). Structures and crystal chemistry of the double perovskites Ba(2)LnB'O6 (Ln = lanthanide B'=Nb5+ and Ta5+), Part I - investigation of Ba(2)LnTaO(6) using synchrotron x-ray and neutron powder diffraction. Journal of Solid State Chemistry, 180(11), 2991-3000.
Abstract: The structure of 14 compounds in the series Ba(2)LnTaO(6) have been examined using synchrotron X-ray diffraction and found to undergo a sequence of phase transitions from I2/m monoclinic to I4/m tetragonal to Fm (3) over barm cubic symmetry with decreasing ionic radii of the lanthanides. Ba2LaTaO6 is an exception to this with variable temperature neutron diffraction being used to establish that the full series of phases adopted over the range of 15-500 K is P2(1)/n monoclinic to I2/m monoclinic to R (3) over bar rhombohedral. The chemical environments of these compounds have also been investigated and the overbonding to the lanthanide cations is due to the unusually large size for the B-site in these perovskites. © 2007, Elsevier Ltd.
URI: http://dx.doi.org/10.1016/j.jssc.2007.08.009
http://apo.ansto.gov.au/dspace/handle/10238/1911
ISSN: 0022-4596
Appears in Collections:Journal Articles

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