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Title: Structural studies of the high temperature phases of AgTaO3
Authors: Farid, U
Khan, HU
Avdeev, M
Injac, S
Kennedy, BJ
Keywords: Perovskites
Phase transformations
X-ray diffraction
Neutron diffraction
Crystal structure
Issue Date: 1-Feb-2018
Publisher: Elsevier
Citation: Farid, U., Khan, H. U., Avdeev, M., Injac, S., & Kennedy, B. J. (2018) Structural studies of the high temperature phases of AgTaO3. Journal of Solid State Chemistry, 258, 859-864. doi:10.1016/j.jssc.2017.12.023
Abstract: Abstract: The temperature dependence of the structure of a polycrystalline sample of AgTaO3 has been determined using in-situ Synchrotron X-ray powder diffraction methods. This work finds no evidence for the presence of a monoclinic phase, rather three phase transitions have been identified, namely R3c↔390°CCmcm↔465°CP4/mbm↔580°CPm3̅m. The rhombohedral phase was further studied at room temperature by neutron powder diffraction. The co-existence of the rhombohedral and orthorhombic phases around 380–400 ° C indicates that the transition between these is first order, and gives rise to unusual peak shapes in the diffraction patterns. © 2017 Elsevier Inc.
ISSN: 0022-4596
Appears in Collections:Journal Articles

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