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Local A‐Site Layering in Rare‐Earth Orthochromite Perovskites by Solution Synthesis
Author(s) -
Daniels Luke M.,
Kashtiban Reza J.,
Kepaptsoglou Demie,
Ramasse Quentin M.,
Sloan Jeremy,
Walton Richard I.
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201604766
Subject(s) - hydrothermal circulation , annealing (glass) , transmission electron microscopy , ionic radius , layering , materials science , electron energy loss spectroscopy , hydrothermal synthesis , nanoscopic scale , spectroscopy , homogeneity (statistics) , mineralogy , solid state , crystallography , chemical physics , chemical engineering , chemistry , nanotechnology , ion , metallurgy , botany , physics , biology , statistics , organic chemistry , mathematics , quantum mechanics , engineering
Cation size effects were examined in the mixed A‐site perovskites La 0.5 Sm 0.5 CrO 3 and La 0.5 Tb 0.5 CrO 3 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 La 0.5 Tb 0.5 CrO 3 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 La 3+ and Tb 3+ . The A‐site layering in hydrothermal La 0.5 Tb 0.5 CrO 3 is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.