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

Luke M DanielsReza J KashtibanDemie KepaptsoglouQuentin M RamasseJeremy SloanRichard D Walton
Published in: Chemistry (Weinheim an der Bergstrasse, Germany) (2016)
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.
Keyphrases
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