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Fundamentals of Cubic Phase Synthesis in PbF2-EuF3 System.

Sofia Zykova1, Kristina Runina1, Mariya Mayakova1,2

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PubMed
Summary

This study maps phase boundaries in the lead fluoride-europium fluoride (PbF2-EuF3) system. Researchers precisely defined regions for cubic and rhombohedral phases, enabling the design of advanced fluoride materials.

Keywords:
co-precipitationeuropium fluoridelead fluoridesolid solutionssolid-phase synthesis

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Thermodynamics

Background:

  • Fluoride solid solutions, like the PbF2-EuF3 system, offer exceptional optical and thermodynamic properties for advanced applications.
  • Incomplete understanding of phase equilibria and homogeneity regions in the PbF2-EuF3 system hinders the rational design of single-phase materials.

Purpose of the Study:

  • To comprehensively investigate the thermodynamic conditions (temperature and composition) governing phase equilibria in the PbF2-EuF3 system.
  • To precisely define the boundaries of cubic and rhombohedral phases within the homogeneity regions of the PbF2-EuF3 system.

Main Methods:

  • Synthesis of solid solution samples using solid-phase synthesis and co-precipitation techniques.
  • Systematic investigation of phase equilibria in critical regions (solvus line and rhombohedral R-phase region).
  • Structural characterization using X-ray phase analysis, optical probing, and Raman scattering below 365 °C.

Main Results:

  • Demonstrated the possibility of obtaining high-purity cubic PbF2-EuF3 preparations across the 0-37 mol% EuF3 composition range.
  • Precisely defined the existence region of the ordered rhombohedral R-phase between 37-39 mol% and 43-44 mol% EuF3.

Conclusions:

  • Provided essential thermodynamic data for the rational design of PbF2-EuF3 solid solutions.
  • Established clear compositional boundaries for achieving desired phase structures in this technologically important fluoride system.