Study of the Fracture Toughness of K2NixCo(1 – x)(SO4)2 · 6H2O Crystals in Dependence of the Growth Direction and Rate
- Authors: Koldaeva M.V.1, Rudneva E.B.1, Manomenova V.L.1, Voloshin A.E.1, Masalov V.M.2, Zhokhov A.A.2, Emelchenko G.A.2
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Affiliations:
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,” Russian Academy of Sciences
- Institute of Solid State Physics, Russian Academy of Sciences
- Issue: Vol 64, No 6 (2019)
- Pages: 926-931
- Section: Physical Properties of Crystals
- URL: https://journals.rcsi.science/1063-7745/article/view/194320
- DOI: https://doi.org/10.1134/S1063774519060099
- ID: 194320
Cite item
Abstract
K2Ni(SO4)2 · 6H2O (KNSH), K2Co(SO4)2 · 6H2O (KCSH), and K2NixCo(1 – x)(SO4)2 · 6H2O (KCNSH) crystals have been grown by traditional and accelerated techniques. The microhardness and crack lengths were measured by indentation with a Vickers pyramid in dependence of the crystal growth conditions in order to improve the crystal structure and properties. It was shown that, with an increase in the growth rate, the stress intensity factor of the crystals (which characterizes the fracture toughness) changes in dependence of the composition: it decreases for KCSH (due to the rise in inhomogeneity) but increases for KCNSH, which is explained by lowering the level of both the mosaic and radial inhomogeneity. In the case of KNSH crystals, the fracture toughness of the {110} sector decreases, whereas the changes in the sector {001} of “slow” crystal are differently directed, which is explained by the high inhomogeneity of its composition.
About the authors
M. V. Koldaeva
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: rudneva.lena@inbox.ru
Russian Federation, Moscow, 119333
E. B. Rudneva
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Author for correspondence.
Email: rudneva.lena@inbox.ru
Russian Federation, Moscow, 119333
V. L. Manomenova
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: rudneva.lena@inbox.ru
Russian Federation, Moscow, 119333
A. E. Voloshin
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”Russian Academy of Sciences
Email: rudneva.lena@inbox.ru
Russian Federation, Moscow, 119333
V. M. Masalov
Institute of Solid State Physics, Russian Academy of Sciences
Email: rudneva.lena@inbox.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432
A. A. Zhokhov
Institute of Solid State Physics, Russian Academy of Sciences
Email: rudneva.lena@inbox.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432
G. A. Emelchenko
Institute of Solid State Physics, Russian Academy of Sciences
Email: rudneva.lena@inbox.ru
Russian Federation, Chernogolovka, Moscow oblast, 142432