Isovalent Cation Ordering in the Polar Rhombohedral Perovskite Bi 2 FeAlO 6

De, Chandan ; Arévalo‐López, Ángel M. ; Orlandi, Fabio ; Manuel, Pascal ; Attfield, J. Paul ; Sundaresan, Athinarayanan (2018) Isovalent Cation Ordering in the Polar Rhombohedral Perovskite Bi 2 FeAlO 6 Angewandte Chemie International Edition, 57 (49). pp. 16099-16103. ISSN 1433-7851

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Official URL: http://doi.org/10.1002/anie.201810122

Related URL: http://dx.doi.org/10.1002/anie.201810122

Abstract

Ordering of cations in different structural types occurs when there is a significant difference in the oxidation states and ionic radii of the ions involved. Herein we report an unusual ordering of isovalent cations Fe3+ and Al3+ in the polar rhombohedral R3 double perovskite structure of Bi2FeAlO6 synthesized at high-pressure (6 GPa) and high-temperature (1000 °C). This ordered structure is derived from the 1:1 combination of the polar oxides BiFeO3 (R3c) and BiAlO3 (R3c), which results in reduction of symmetry to an R3 structure where the Fe3+ and Al3+ ions are ordered in a rock salt manner. However, these ions remain disordered in BiFe1−xAlxO3 (x=0.2, 0.3, 0.4) perovskites with R3c structure. The ordered compound undergoes antiferromagnetic ordering at TN≈280 K. The butterfly nature of piezoelectric displacement loop further confirms the polar nature of the cation-ordered Bi2FeAlO6.

Item Type:Article
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ID Code:119979
Deposited On:21 Jun 2021 06:20
Last Modified:21 Jun 2021 06:20

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