Problems with the preparation of anhydrous single crystal sulphates. I. M2+SO4 (M = Fe, Co, Ni)

Abstract The article deals with the problems retarded to preparing the single crystals of anhydrous sulphates of the iron‐metal group. The article provides a comprehensive review on up to date recent knowledge on the chemical and physical properties of these sulphates and, in addition, it describes some methods of preparing their anhydrous form. Also inform about the experiments of single crystal growth. It exhibits the facility of the solution of this problem, that is still under investigation.