The Influence of Supercooling and Hydrodynamics on the Mosaic and Radial Inhomogeneity of K<sub>2</sub>Ni<sub>X</sub>Co<sub>(1–X)</sub>(SO<sub>4</sub>)<sub>2</sub>·6H<sub>2</sub>O Mixed Crystal
Natalia A. Vasilyeva,
Elena B. Rudneva,
Vera L. Manomenova,
Yuriy V. Grigoriev,
Alexey E. Voloshin
Affiliations
Natalia A. Vasilyeva
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, 119333 Moscow, Russia
Elena B. Rudneva
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, 119333 Moscow, Russia
Vera L. Manomenova
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, 119333 Moscow, Russia
Yuriy V. Grigoriev
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, 119333 Moscow, Russia
Alexey E. Voloshin
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics”, Russian Academy of Sciences, 119333 Moscow, Russia
The mosaic and radial inhomogeneity of shaped mixed crystals of K2NixCo(1–x)(SO4)2·6H2O (KCNSH) were studied depending on the supercooling of solution, its velocity and its method of supply into the shaper. It was shown that mosaic inhomogeneity could be suppressed when solution is supercooled to about 2 °C. Peripheral supply of the solution (tangential to the wall of the shaper to create a “swirling” flow) with a rate of 55–135 cm/s provides better composition uniformity along the crystal surface in comparison with upright supply of the solution (flow is perpendicular to the crystal surface).
