Thermal expansion and cation disorder in Bi2InNbO7 |
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| Authors: | Qingdi Zhou Valeska Ting |
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| Institution: | a School of Chemistry, The Centre for Heavy Metals Research, The University of Sydney, F11 Sydney, New South Wales 2006, Australia
b Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia |
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| Abstract: | The structure of the pyrochlore-type oxide Bi2InNbO7 has been investigated between room temperature and 700 °C using electron and synchrotron X-ray powder diffraction and at room temperature and 10 K using neutron diffraction methods. Bi2InNbO7 exhibits an A2B2O7 cubic pyrochlore-type average structure at all temperatures that is characterized by an apparently random mixing of the In3+ and Nb5+ cations on the octahedral B sites. The Bi cations on the eight-coordinate pyrochlore A sites are displacively disordered, presumably as a consequence of their lone pair electron configuration. Heating the sample does not alter this disorder. |
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| Keywords: | Bismuth pyrochlore Cation disorder Thermal expansion |
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