COMPOSITION MATERIALS IN THE CaF2–BaF2 SYSTEM

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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.

About the authors

I. I. Buchinskaya

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences, Moscow, 119333 Russia

Email: buchinskayaii@gmail.com
Россия, Москва

T. O. Teplyakova

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia

Email: buchinskayaii@gmail.com
Россия, Москва

N. I. Sorokin

Shubnikov Institute of Crystallography, Federal Scientific and Research Center “Crystallography and Photonics,” Russian Academy of Sciences, Moscow, 119333 Russia

Email: nsorokin1@yandex.ru
Россия, Москва

D. N. Karimov

Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences, Moscow, 119333 Russia

Author for correspondence.
Email: dnkarimov@gmail.com
Россия, Москва

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