Production of Complex Hydrosulphates in the K3H(SO4)2–Rb3H(SO4)2 Series: Part I
The phase equilibria in the K3H(SO4)2–Rb3H(SO4)2–H2O cross section have been investigated under isothermal conditions at 25°C. The concentration limits of crystallization of solid solutions with the general formulas (Rb1 – xKx)3H(SO4)2 and (Rb1 – xKx)2SO4 are determined. The dependences of the equilibria of saturated solution on the initial production conditions are revealed. The growth conditions for large single crystals of complex acid rubidium–potassium sulfates are determined.
Experimental studies were carried out using equipment of the Shared Equipment Center of the Shubnikov Institute of Crystallography, Russian Academy of Sciences.
This study was supported by the Russian Foundation for Basic Research (project no. 17-53-45107) in the part concerning the characterization of crystals and by the Ministry of Science and Higher Education of the Russian Federation in the part concerning the crystal growth, within the government research contract with the Federal Scientific Research Centre “Crystallography and Photonics” of the Russian Academy of Sciences. Experimental studies were supported by the Ministry of Higher Education and Science of the Russian Federation (project no. RFMEFI62114X0005).