COMPOSITION MATERIALS IN THE CaF2–BaF2 SYSTEM

I. I. Buchinskaya; Бучинская И. И.; T. O. Teplyakova; Теплякова Т. О.; N. I. Sorokin; Сорокин Н. И.; D. N. Karimov; Каримов Д. Н.

doi:10.31857/S0023476123020054

COMPOSITION MATERIALS IN THE CaF2–BaF2 SYSTEM

Authors: Buchinskaya I.I.¹, Teplyakova T.O.², Sorokin N.I.³, Karimov D.N.¹
Affiliations:
1. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences, Moscow, 119333 Russia
2. Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia
3. Shubnikov Institute of Crystallography, Federal Scientific and Research Center “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia
Issue: Vol 68, No 2 (2023)
Pages: 306-312
Section: НАНОМАТЕРИАЛЫ, КЕРАМИКА
URL: https://journals.rcsi.science/0023-4761/article/view/137387
DOI: https://doi.org/10.31857/S0023476123020054
EDN: https://elibrary.ru/BPZTRK
ID: 137387

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Abstract
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Abstract

Composite nanomaterials (1 – x)CaF2–xBaF2 with 0.4 ≤ х ≤ 0.6 have been prepared by directional melt crystallization in a fluorinating atmosphere. The structural, optical, mechanical, and electrical characteristics of the synthesized nanocomposites are studied. Biphasic (1 – x)CaF2–xBaF2 composites have a lamellar fine microstructure. The lamella thickness decreases with an increase in the BaF2 content and reaches 30–50 nm for the composition with x = 0.5. The composites retain high transparency in the IR range (close to the values for the initial components). The microhardness (НV ≈ 5.0 GPa) and ionic conductivity (σdc = (1–3) × 10³ S/cm at 823 K) of these composites exceed significantly the corresponding parameters of CaF2 and BaF2 crystals. The fluoride nanocomposites under investigation are promising materials for practical applications in photonics and solid-state ionics.

Keywords

COMPOSITE NANOMATERIALS, MICROHARDNESS, IONIC CONDUCTIVITY

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