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Open AccessArticle

Growth from the Melt and Properties Investigation of ScF3 Single Crystals

1
Shubnikov Institute of Crystallography of Federal Scientific Research Center «Crystallography and Photonics», Russian Academy of Sciences, Leninskiy Prospekt 59, Moscow 119333, Russia
2
Lomonosov Moscow State University, GSP-1, Leninskie Gory, Moscow 119991, Russia
3
Petrovsky Bryansk State University, Bezhitskaya str. 14, Bryansk 241036, Russia
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(7), 371; https://doi.org/10.3390/cryst9070371
Received: 28 June 2019 / Revised: 12 July 2019 / Accepted: 19 July 2019 / Published: 20 July 2019
(This article belongs to the Special Issue Rare-Earth Metal Compounds)
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Abstract

ScF3 optical quality bulk crystals of the ReO3 structure type (space group P m 3 ¯ m , a = 4.01401(3) Å) have been grown from the melt by Bridgman technique, in fluorinating atmosphere for the first time. Aiming to substantially reduce vaporization losses during the growth process graphite crucibles were designed. The crystal quality, optical, mechanical, thermal and electrophysical properties were studied. Novel ScF3 crystals refer to the low-refractive-index (nD = 1.400(1)) optical materials with high transparency in the visible and IR spectral region up to 8.7 µm. The Vickers hardness of ScF3 (HV ~ 2.6 GPa) is substantially higher than that of CaF2 and LaF3 crystals. ScF3 crystals possess unique high thermal conductivity (k = 9.6 Wm−1К−1 at 300 K) and low ionic conductivity (σ = 4 × 10−8 Scm−1 at 673 К) cause to the structural defects in the fluorine sublattice. View Full-Text
Keywords: scandium fluoride; growth from the melt; Bridgman technique; bulk crystals; thermomiotic materials; negative thermal expansion; optical materials; crystal characterization; refractive index; thermal conductivity; ionic conductivity; microhardness scandium fluoride; growth from the melt; Bridgman technique; bulk crystals; thermomiotic materials; negative thermal expansion; optical materials; crystal characterization; refractive index; thermal conductivity; ionic conductivity; microhardness
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Karimov, D.; Buchinskaya, I.; Arkharova, N.; Prosekov, P.; Grebenev, V.; Sorokin, N.; Glushkova, T.; Popov, P. Growth from the Melt and Properties Investigation of ScF3 Single Crystals. Crystals 2019, 9, 371.

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