title: Local A-Site Layering in Rare-Earth Orthochromite Perovskites by Solution Synthesis.
abstract: Cation size effects were examined in the mixed A-site perovskites La0.5Sm0.5CrO3and La0.5Tb0.5CrO3prepared 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 La0.5Tb0.5CrO3results 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 La0.5Tb0.5CrO3is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.
authors.affiliation: Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
authors.forename: Luke M
authors.initials: LM
authors.lastname: Daniels
authors.affiliation: Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
authors.forename: Reza J
authors.initials: RJ
authors.lastname: Kashtiban
authors.affiliation: SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury, WA4 4AD, UK.
authors.forename: Demie
authors.initials: D
authors.lastname: Kepaptsoglou
authors.affiliation: SuperSTEM Laboratory, SciTech Daresbury Campus, Daresbury, WA4 4AD, UK.
authors.forename: Quentin M
authors.initials: QM
authors.lastname: Ramasse
authors.affiliation: Department of Physics, University of Warwick, Coventry, CV4 7AL, UK.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Sloan
authors.affiliation: Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK.
authors.forename: Richard I
authors.identifier: http://orcid.org/0000-0002-9687-2545
authors.initials: RI
authors.lastname: Walton
keywords: chromites; electron energy loss spectroscopy (EELS); hydrothermal synthesis; magnetism; perovskites