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Preparation, Characterization, and Structural Phase Transitions in a New Family of Semiconducting Transition Metal Oxychalcogenides ß-La2O2MSe2(M= Mn, Fe)

McCabe, Emma E., Free, David G, Mendis, Budhika, Higgins, Joshua S, Evans, John S O (2010) Preparation, Characterization, and Structural Phase Transitions in a New Family of Semiconducting Transition Metal Oxychalcogenides ß-La2O2MSe2(M= Mn, Fe). Chemistry of Materials, 22 (22). pp. 6171-6182. ISSN 1520-5002. (doi:10.1021/cm1023103) (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) (KAR id:40496)

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. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1021/cm1023103

Abstract

Two new oxyselenide materials have been synthesized with composition La2O2MSe2 (M = Mn, Fe). They adopt a new structure type, the ? structure, which has been solved and refined from powder X-ray and neutron diffraction data. The structure is described by Ama2 symmetry with unit cell 17.5 Å × 16.6 Å × 4.0 Å and consists of sheets of MSen polyhedra separated by La2O2Se blocks. A structural phase transition occurs on cooling involving ordering of M cations and a symmetry reduction to a primitive structure of Pna21 symmetry. Both manganese and iron analogues are antiferromagnetic at low temperature. ?-La2O2FeSe2 is a semiconductor in the temperature of 150?300 K with a band gap of approximately 0.7 eV while ?-La2O2MnSe2 is insulating at room temperature with band gap of 1.6 eV.

Item Type: Article
DOI/Identification number: 10.1021/cm1023103
Additional information: number of additional authors: 2;
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: 01 Aug 2019 10:37 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/40496 (The current URI for this page, for reference purposes)
McCabe, Emma E.: https://orcid.org/0000-0001-5868-4570
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