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The Problem of Formation of Mixed Crystals and High-Efficiency K2(Co, Ni)(SO4)2 • 6H2O Optical Filters

1
Shubnikov Institute of Crystallography of Federal Scientific Research Center “Crystallography and Photonics” of Russian Academy of Sciences, Moscow 119333, Russia
2
Institute of Solid State Physics of Russian Academy of Sciences, Chernogolovka, Moscow District 142432, Russia
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(8), 390; https://doi.org/10.3390/cryst9080390
Received: 1 July 2019 / Revised: 26 July 2019 / Accepted: 27 July 2019 / Published: 29 July 2019
(This article belongs to the Section Crystalline Materials)
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Abstract

This review, for the first time, summarizes the results of studies of the defect formation mechanisms in mixed crystals grown from aqueous solutions. The general mechanism of interaction of a crystal with a foreign solution is described (reaction of isomorphous replacement). As a result of this reaction, the crystal surface turns into a mosaic of local areas where multidirectional processes (dissolution and growth) occur simultaneously. Data on mosaic microinhomogeneity, which is a new type of composition inhomogeneity inherent solely to multicomponent crystals, is presented. A new mechanism for the mismatch stress relaxation in heterocompositions of brittle crystals grown from low-temperature solutions is described; in this case, the formation of misfit dislocations is impossible and stress relaxation occurs due to the formation of numerous inclusions at the interface. The general concept of growing high-quality mixed crystals from solutions is described, using the example of K2(Co, Ni)(SO)2 · 6H2O (KCNSH) mixed crystals. View Full-Text
Keywords: solution crystal growth; mixed crystals; isomorphous replacement; mechanism of stress relaxation; optical filters; solar-blind technology solution crystal growth; mixed crystals; isomorphous replacement; mechanism of stress relaxation; optical filters; solar-blind technology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Voloshin, A.; Rudneva, E.; Manomenova, V.; Vasilyeva, N.; Kovalev, S.; Emelchenko, G.; Masalov, V.; Zhokhov, A. The Problem of Formation of Mixed Crystals and High-Efficiency K2(Co, Ni)(SO4)2 • 6H2O Optical Filters. Crystals 2019, 9, 390.

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