Cation size effects were examined in the mixed A-site perovskites La Sm CrO and La Tb CrO 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 Tb CrO 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 and Tb . The A-site layering in hydrothermal La Tb CrO is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.
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| http://dx.doi.org/10.1002/chem.201604766 | DOI Listing |
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