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Magnetic structure and electronic study of complex oxygen-deficient manganites.

Authors
  • Cortés-Gil, Raquel
  • Hernando, María
  • Ruiz-González, M Luisa
  • Céspedes, Eva
  • Prieto, Carlos
  • Alonso, José M
  • Vallet-Regí, María
  • Hernando, Antonio
  • González-Calbet, José M
Type
Published Article
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
Publication Date
Jan 01, 2008
Volume
14
Issue
29
Pages
9038–9045
Identifiers
DOI: 10.1002/chem.200800723
PMID: 18688841
Source
Medline
License
Unknown

Abstract

Neutron diffraction and X-ray absorption near-edge structure (XANES) studies have been performed in La0.5Ca0.5MnO2.5, La0.5Sr0.5MnO2.5 and Nd0.5Sr0.5MnO2.5 oxygen-deficient perovskite compounds obtained by topotactic reduction. They all exhibit a brownmillerite structure with G-type antiferromagnetic ordering. Mn2+, Mn3+ and Mn4+ coexist at the octahedral sites, whereas only Mn2+ is placed in the tetrahedral positions. A magnetic moment of 1.6 microB has been detected at the tetrahedral layers, which can be explained by assuming Mn2+ is in a low-spin configuration.

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