Mn(I) in an Extended Oxide: The Synthesis and Characterization of La1-xCaxMnO2+d(0.6 = x = 1)

Dixon, Edward, Hadermann, Joke, Ramos, Silvia, Goodwin, Andrew L, Hayward, Michael A (2011) Mn(I) in an Extended Oxide: The Synthesis and Characterization of La1-xCaxMnO2+d(0.6 = x = 1). Journal of the American Chemical Society, 133 (45). pp. 18397-18405. ISSN 0002-7863. E-ISSN 1520-5126. (doi:10.1021/ja207616c) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://dx.doi.org/10.1021/ja207616c

Abstract

Reduction of La1–xCaxMnO3 (0.6 ? x ? 1) perovskite phases with sodium hydride yields materials of composition La1–xCaxMnO2+?. The calcium-rich phases (x = 0.9, 1) adopt (La0.9Ca0.1)0.5Mn0.5O disordered rocksalt structures. However local structure analysis using reverse Monte Carlo refinement of models against pair distribution functions obtained from neutron total scattering data reveals lanthanum-rich La1–xCaxMnO2+? (x = 0.6, 0.67, 0.7) phases adopt disordered structures consisting of an intergrowth of sheets of MnO6 octahedra and sheets of MnO4 tetrahedra. X-ray absorption data confirm the presence of Mn(I) centers in La1–xCaxMnO2+? phases with x < 1. Low-temperature neutron diffraction data reveal La1–xCaxMnO2+? (x = 0.6, 0.67, 0.7) phases become antiferromagnetically ordered at low temperature.

Item Type: Article
DOI/Identification number: 10.1021/ja207616c
Additional information: number of additional authors: 4;
Subjects: Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences
Depositing User: Stewart Brownrigg
Date Deposited: 07 Mar 2014 00:05 UTC
Last Modified: 29 May 2019 12:25 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/40497 (The current URI for this page, for reference purposes)
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