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


Daniels, Luke M ORCID: 0000-0002-7077-6125, Kashtiban, Reza J, Kepaptsoglou, Demie, Ramasse, Quentin M, Sloan, Jeremy and Walton, Richard I (2016) Local A-Site Layering in Rare-Earth Orthochromite Perovskites by Solution Synthesis. CHEMISTRY-A EUROPEAN JOURNAL, 22 (51). pp. 18362-18367.

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Abstract

Cation size effects were examined in the mixed A-site perovskites La<sub>0.5</sub> Sm<sub>0.5</sub> CrO<sub>3</sub> and La<sub>0.5</sub> Tb<sub>0.5</sub> CrO<sub>3</sub> 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<sub>0.5</sub> Tb<sub>0.5</sub> CrO<sub>3</sub> 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<sup>3+</sup> and Tb<sup>3+</sup> . The A-site layering in hydrothermal La<sub>0.5</sub> Tb<sub>0.5</sub> CrO<sub>3</sub> is randomised upon annealing at high temperature, resulting in magnetic behaviour that is dependent on synthesis route.

Item Type: Article
Uncontrolled Keywords: chromites, electron energy loss spectroscopy (EELS), hydrothermal synthesis, magnetism, perovskites
Depositing User: Symplectic Admin
Date Deposited: 21 Aug 2018 09:27
Last Modified: 19 Jan 2023 01:26
DOI: 10.1002/chem.201604766
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3025337
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