BINARY-SYSTEMS WITH LI2SO4 AS ONE OF THE COMPONENTS

Six binary systems were studied using DTA with supplementary XRD. In Li2SO4-MSO4 SYStems (M = Mg, Co, Ni), a primary solid solution with alpha-Li2SO4 StruCtUre (high-temperature form) and an incongruent melting compound Li2My(SO4)1+y exist: y = 2 with Mg and y = 1 with Co and Ni. In Li2SO4-Li3XO4 systems (X = P, V), which are very different from one another, only primary solid solutions exist. In the Li2SO4-Li2B4O7 system there is neither a solid solution nor an intermediate compound. Comparisons with previous investigations are made.