TITLE:
Crystallization in the Three-Component Systems Rb2SO4-MSO4-H2O (M = Mg, Co, Ni, Cu, Zn) at 298 K
AUTHORS:
Veronika Karadjova, Donka Stoilova
KEYWORDS:
Rb2Me(SO4)2·6H2O (Me = Mg, Co, Ni, Cu, Zn); Solubility Diagrams; X-Ray Powder Diffraction; Infrared Spectra; Matrix Infrared Spectroscopy
JOURNAL NAME:
Journal of Crystallization Process and Technology,
Vol.3 No.4,
October
18,
2013
ABSTRACT:
The crystallization in the
three-component systems Rb2SO4-MSO4-H2O (M = Mg, Co, Ni, Cu,
Zn) is studied by the method of isothermal decrease of supersaturation. It has
been established that isostructural double compounds,
Rb2M(SO4)2·6H2O (M = Mg, Co, Ni, Cu, Zn), , crystallize from the
ternary solutions within wide
concentration ranges. The infrared spectra are discussed with respect to
the normal vibrations of the sulfate ions and water molecules. The unit-cell
group theoretical treatment of the double salts is presented. The extent of
energetic distortions
of guest ions (about 2 mol%) matrix-isolated in
the respective selenates, (M' =
K, Rb, ; M" = Mg, Co, Ni, Cu, Zn), is commented.