Abstract
The crystal structure of BiMnO3 + δ is studied as a function of the nominal oxygen content using X-ray synchrotron diffraction. It is found that an increase in the nominal oxygen-ion concentration leads to a series of phase transitions from the monoclinic (C2/c) to another monoclinic phase (P21/c) and then to the orthorhombic structure Pnma through the formation of a two-phase structural state. The indicated sequence of the phase transitions is accompanied by gradual destruction of the orbital ordering formed by the orbitals of Mn3+ ions, which is caused by the nonuniform distribution of vacancies of manganese ions in the B positions of the perovskite lattice.
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ACKNOWLEDGMENTS
We thank the Helmholtz-Zentrum Berlin für Materialien und Energie for the synchrotron studies.
Funding
The research was carried out with the support of the Russian Foundation for Basic Research (project no. 20-52-00023) and the Belarusian Republican Foundation for Basic Research (project no. T20P-121) within the framework of the State assignment of the Ministry of Higher Education and Science, project FZWM-2020-0008.
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Sikolenko, V.V., Chobot, A.N., Bushinsky, M.V. et al. Crystal Structure and Orbital Ordering in BiMnO3 + δ (0 < δ ≤ 0.14) Ceramics. J. Surf. Investig. 16, 96–100 (2022). https://doi.org/10.1134/S1027451022010335
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DOI: https://doi.org/10.1134/S1027451022010335