• Phonons in mixed superionic fluorites (BaF2)1–𝑥(LaF3)𝑥

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      https://www.ias.ac.in/article/fulltext/boms/025/06/0459-0462

    • Keywords

       

      Superionic properties; (MF2)1–𝑥(RF3)𝑥; fast ion conductors.

    • Abstract

       

      In recent years, the fluorite-structured solid solutions with the general formula, (MF2)1–𝑥(RF3)𝑥 (M = Ca, Sr, Ba, Pb and R is a rare-earth element or Y), have been the subject of numerous experimental studies focussed on their superionic properties. The overall cubic crystal symmetry (space group 𝐹𝑚3𝑚) is conserved up to 𝑥 ≤ 𝑥max, where 𝑥max 0.4–0.5 depending on M and R. The zone centre phonons and phonon dispersion along three symmetry directions of the mixed superionic compound (BaF2)1–𝑥(LaF3)𝑥 have been investigated by applying de Launey angular force model for 𝑥 ≤ 𝑥max. The calculated results are compared and explained with available experimental results.

    • Author Affiliations

       

      M M Sinha1

      1. Department of Physics, Sant Longowal Institute of Engineering and Technology, Longowal, Sangrur 148 106, India
    • Dates

       
  • Bulletin of Materials Science | News

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