Investigation of the ordering of Ba1–xLaxF2+x solid solutions during phase formation from a solution in a sodium nitrate melt
- Authors: Fedorov P.P.1, Alexandrov A.A.1,2, Kuznetsov S.V.1, Baranchikov A.E.2, Ivanov V.K.2
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Affiliations:
- Prokhorov General Physics Institute of the Russian Academy of Sciences
- Kurnakov Institute of General and Inorganic Chemistry
- Issue: Vol 520, No 1 (2025)
- Pages: 53-59
- Section: PHYSICAL CHEMISTRY
- URL: https://journals.rcsi.science/2686-9535/article/view/294521
- DOI: https://doi.org/10.31857/S2686953525010067
- EDN: https://elibrary.ru/AWDJPN
- ID: 294521
Cite item
Abstract
Matrices based on inorganic fluorides have garnered significant interest from researchers for the development of effective phosphors. In this study, fluorite-like phases of the composition Ba1–xLnxF2+x, with an LnF3 content of approximately 40 mol. % for Ln = La–Lu, were synthesized by crystallization of fluorides from a NaNO3 melt. It was observed that the by-product of the synthesis, BaF2, dissolves and is removed from the system during the washing of samples with water. A cubic solid solution with a fluorite structure was formed for rare earth elements within the cerium subgroup. Notably, sodium was incorporated into the samples with Ln = Gd–Lu. The formation of trigonal fluorite-like phases with the Ba4Ln3F17 structure occurred during synthesis only for lanthanoides with smaller ionic radii (Tm–Lu). For intermediate-sized rare earth ions (Gd–Ho), fluorite-like tetragonal phases were formed, exhibiting very weak superstructural reflections on the X-ray diffraction patterns. The resulting matrices have potential applications in the development of up-conversion luminophores and optical thermometers.
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About the authors
P. P. Fedorov
Prokhorov General Physics Institute of the Russian Academy of Sciences
Author for correspondence.
Email: ppfedorov@yandex.ru
Russian Federation, 119991 Moscow
A. A. Alexandrov
Prokhorov General Physics Institute of the Russian Academy of Sciences; Kurnakov Institute of General and Inorganic Chemistry
Email: ppfedorov@yandex.ru
Russian Federation, 119991 Moscow; 119991 Moscow
S. V. Kuznetsov
Prokhorov General Physics Institute of the Russian Academy of Sciences
Email: ppfedorov@yandex.ru
Russian Federation, 119991 Moscow
A. E. Baranchikov
Kurnakov Institute of General and Inorganic Chemistry
Email: ppfedorov@yandex.ru
Russian Federation, 119991 Moscow
V. K. Ivanov
Kurnakov Institute of General and Inorganic Chemistry
Email: ppfedorov@yandex.ru
Corresponding Member of the RAS
Russian Federation, 119991 MoscowReferences
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