Abstract
Phase equilibria in the PbF2–RF3 (R = La–Nd, Sm, Gd–Lu, Y, and Sc) systems were studied by X-ray powder diffraction in samples annealed under a fluorinating atmosphere and then quenched and by differential thermal analysis (DTA) under an inert atmosphere using unlidded thin-walled graphite crucibles. Stability areas were elucidated for Pb1 – xRxF2 + x fluorite solid solutions, for R1 – yPbyF3 – y solid solutions having the tysonite LaF3 structure, and for ordered phases of idealized composition Pb4R3F17 having trigonally distorted cubic unit cells. The topological evolution of the systems in response to the changing rare-earth ionic radius was considered.
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ACKNOWLEDGMENTS
The author is grateful to I.P. Zibrov, E.V. Tarasova, S.M. Polunina, and L. Rabardel for participation in the experiments; G.A. Kocherba for chemical analyzes; J.‑M. Reau, S.F. Matar, P. Hagenmuller, and B.P. Sobolev for the discussion of results.
Funding
The word was fulfilled in the frame of the Government assignment to the Prokhorov General Physics Institute in the field of fundamental research.
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Fedorov, P.P. Phase Diagrams of Lead Difluoride Systems with Rare-Earth Fluorides. Russ. J. Inorg. Chem. 66, 245–252 (2021). https://doi.org/10.1134/S0036023621020078
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Keywords:
- lead fluoride
- rare-earth fluorides
- phase diagrams
- thermal analysis
- X-ray powder diffraction analysis
- solid solutions
- heterovalent isomorphism