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

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Author(s)

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

Department/unit(s)

Publication details

JournalChemistry : A European Journal
DateAccepted/In press - 11 Oct 2016
DateE-pub ahead of print (current) - 3 Nov 2016
Issue number51
Volume22
Number of pages6
Pages (from-to)18362-18367
Early online date3/11/16
Original languageEnglish

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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© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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  • Journal Article

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