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- Title
Fluorite Solid Solutions of Congruent Melting in the PbF<sub>2</sub>–CdF<sub>2</sub>–RF<sub>3</sub> Systems.
- Authors
Buchinskaya, I. I.; Fedorov, P. P.
- Abstract
The congruent melting compositions in the MF2–M'F2–RF3 systems (M ≠ M' = Ca, Sr, Cd, Ba, Pb; R are rare-earth elements (REEs)) have been determined based on thermodynamic topological analysis. Crystals of fluorite solid solution in the PbF2–CdF2–RF3 (R = Tb, Ho, Er, Tm, Yb, Lu) systems were grown by the vertical directional crystallization technique. Their phase composition and distribution of components over the crystalline boule length were investigated. Crystals of congruently melting solid solutions (Pb0.67Cd0.33) RxF (R = Tb, Ho, Er, Tm, Yb, Lu) were grown for the first time. Traces of low-temperature transformation—a phase isostructural to the Pb2YF7 compound (sp. gr. I4/m), in which Y sites are occupied by the corresponding R cations and Pb sites can be partially occupied by Cd cations—were found in the crystals with R = Ho, Er, Tm, and Yb. The crystals with R = Tb and Lu have a high degree of homogeneity and are suitable for optical studies.
- Subjects
SOLID solutions; FLUORITE; MELTING; ALKALINE earth metals; YTTERBIUM; CRYSTALLIZATION; CRYSTALS
- Publication
Crystallography Reports, 2024, Vol 69, Issue 2, p270
- ISSN
1063-7745
- Publication type
Article
- DOI
10.1134/S1063774524600182