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Title: Crystal structures and phase transitions in Sr2InTaO6 perovskite
Authors: Zhou, Q
Kennedy, BJ
Avdeev, M
Keywords: Perovskite
Monoclinic lattices
Neutron diffraction
Crystal structure
Issue Date: 7-Oct-2012
Publisher: Springer
Citation: Zhou, Q., Kennedy, B.J, & Avdeev, M. (2013). Crystal structures and phase transitions in Sr2InTaO6 perovskite. Physics & Chemistry of Minerals, 40(8), 603-610. doi:10.1007/s00269-012-0545-5
Abstract: The preparation and crystal structure of the double perovskite oxide Sr2InTaO6 are reported. This oxide has a monoclinic structure in space group P21/n at room temperature, where In and Ta display a rock-salt type ordering with a = 5.73356(10), b = 5.74052(10), c = 8.10905(14) Å and β = 90.022(6)°. Variable temperature neutron diffraction measurements demonstrate this displays the sequence of phase transitions P21/n⟶605∘CI2/m⟶705∘CI4/m⟶930∘CFm3ˉm as a consequence of the sequential loss of tilting of the corner shared octahedra upon heating. The evolution of Sr2InTaO6 crystal structure upon heating is analysed and described in terms of symmetry-adapted distortion modes. The GM4+ and X3+, that are responsible for anti-phase and in-phase tilting, respectively, are highly temperature dependent, with the GM4+ mode having the largest amplitude at room temperature. © 2013, Springer.
Gov't Doc #: 5049
ISSN: 1432-2021
Appears in Collections:Journal Articles

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