Local A-Site Layering in Rare-Earth Orthochromite Perovskites by Solution Synthesis

Luke M Daniels; Reza J Kashtiban; Demie Kepaptsoglou; Quentin M Ramasse; Jeremy Sloan; Richard I Walton

doi:10.1002/chem.201604766

Local A-Site Layering in Rare-Earth Orthochromite Perovskites by Solution Synthesis

Luke M Daniels, Reza J Kashtiban, Demie Kepaptsoglou, Quentin M Ramasse, Jeremy Sloan, Richard I Walton

Research output: Contribution to journal › Article › peer-review

Abstract

Cation size effects were examined in the mixed A-site perovskites La0.5 Sm0.5 CrO3 and La0.5 Tb0.5 CrO3 prepared through both hydrothermal and solid-state methods. Atomically resolved electron energy loss spectroscopy (EELS) in the transmission electron microscope shows that while the La and Sm cations are randomly distributed, increased cation-radius variance in La0.5 Tb0.5 CrO3 results in regions of localised La and Tb layers, an atomic arrangement exclusive to the hydrothermally prepared material. Solid-state preparation gives lower homogeneity resulting in separate nanoscale regions rich in La3+ and Tb3+ . The A-site layering in hydrothermal La0.5 Tb0.5 CrO3 is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.

Original language	English
Pages (from-to)	18362-18367
Number of pages	6
Journal	Chemistry : A European Journal
Volume	22
Issue number	51
Early online date	3 Nov 2016
DOIs	https://doi.org/10.1002/chem.201604766
Publication status	E-pub ahead of print - 3 Nov 2016

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Journal Article

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10.1002/chem.201604766Licence: CC BY

Daniels_et_al-2016-Chemistry_-_A_European_Journal
© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.
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Cite this

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abstract = "Cation size effects were examined in the mixed A-site perovskites La0.5 Sm0.5 CrO3 and La0.5 Tb0.5 CrO3 prepared through both hydrothermal and solid-state methods. Atomically resolved electron energy loss spectroscopy (EELS) in the transmission electron microscope shows that while the La and Sm cations are randomly distributed, increased cation-radius variance in La0.5 Tb0.5 CrO3 results in regions of localised La and Tb layers, an atomic arrangement exclusive to the hydrothermally prepared material. Solid-state preparation gives lower homogeneity resulting in separate nanoscale regions rich in La3+ and Tb3+ . The A-site layering in hydrothermal La0.5 Tb0.5 CrO3 is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.",

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AU - Daniels, Luke M

AU - Kashtiban, Reza J

AU - Kepaptsoglou, Demie

AU - Ramasse, Quentin M

AU - Sloan, Jeremy

AU - Walton, Richard I

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AB - Cation size effects were examined in the mixed A-site perovskites La0.5 Sm0.5 CrO3 and La0.5 Tb0.5 CrO3 prepared through both hydrothermal and solid-state methods. Atomically resolved electron energy loss spectroscopy (EELS) in the transmission electron microscope shows that while the La and Sm cations are randomly distributed, increased cation-radius variance in La0.5 Tb0.5 CrO3 results in regions of localised La and Tb layers, an atomic arrangement exclusive to the hydrothermally prepared material. Solid-state preparation gives lower homogeneity resulting in separate nanoscale regions rich in La3+ and Tb3+ . The A-site layering in hydrothermal La0.5 Tb0.5 CrO3 is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.

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