Mössbauer studies of mixed-valence manganite Pb3(Mn0.965Fe0.035)7O15
| Autor: | A. A. Bush, V. A. Andrianov, V. P. Gorkov, Yu. D. Perfiliev |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Valence (chemistry) Materials science Analytical chemistry Quadrupole splitting Crystal structure Condensed Matter Physics Manganite 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Ion Condensed Matter::Materials Science 0103 physical sciences Mössbauer spectroscopy Quadrupole Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Hyperfine structure |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 30:17820-17827 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-019-02133-y |
| Popis: | Pb3Mn7O15 manganite with mixed valence (Mn3+/Mn4+) was studied by Mossbauer effect on 57Fe impurity atoms in the temperature range of 80–673 K. The experimental spectra consisted of two main quadrupole doublets corresponding to trivalent Fe atoms replacing Mn atoms in different positions in the crystal lattice. Identification of the doublets was made on the basis of calculations of quadrupole splitting within the point charges model and taking possible polarization of oxygen ions into account. In two temperature ranges: T ≈ 370–510 K, corresponding to the structural phase transition, and at T ≈ 140–230 K, where strong anomalies of the magnetic and electrical properties were observed, the sharp changes in the hyperfine quadrupole splitting were observed. It is assumed that these changes are caused by changes in the valence of manganese ions and structural deformations. |
| Databáze: | OpenAIRE |
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