|
|||||
|
|
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 |
| Affiliation: | Department of Química Inorgánica, Facultad de Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain. |
| 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. |
| Keywords: | magnetic properties manganese neutron diffraction perovskite phases X‐ray absorption spectroscopy |
| 本文献已被 PubMed 等数据库收录！ | |