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Mössbauer studies of mixed-valence manganite Pb3(Mn0.965Fe0.035)7O15

  • V. A. AndrianovEmail author
  • A. A. Bush
  • V. P. Gorkov
  • Yu. D. Perfiliev
Article
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Abstract

Pb3Mn7O15 manganite with mixed valence (Mn3+/Mn4+) was studied by Mössbauer 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.

Notes

Acknowledgements

Authors thank Dr. A.L. Erzinkyan and Dr. V.I. Nesterov for the help with LT Mössbauer measurements and Dr. S.A. Ivanov for X-ray diffraction.

Funding

This work was supported by scientific program of Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University and by Ministry of Education and Science of Russian Federation, Project Number 3.1099.2017/PCh.

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Authors and Affiliations

  1. 1.Scobeltsyn Institute of Nuclear PhysicsLomonosov Moscow State UniversityMoscowRussia
  2. 2.MIREA - Moscow Technological UniversityMoscowRussia
  3. 3.Faculty of Computational Mathematics and CyberneticsLomonosov Moscow State UniversityMoscowRussia
  4. 4.Department of ChemistryLomonosov Moscow State UniversityMoscowRussia

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