The Li, Pb : F, MoO4 system

By the thermographic and visual polythermal methods the interaction of molybdates and lithium and lead fluorides is investigated. It has been found that the exchange reaction is shoarply shifted towards the salts pair of PbMoO4-Lif. In this quasibinary system eutectics is observed at 792 deg C and invinity 2.5% of PbMoO4 and lamination in liquid state to which at 820 deg C the interval invinity 3-64% of PbMoO4 corresponds. The main part of surface of the primary crystallization of ternary mutual system is occupied by the lead molybdate field. Ternary eutectics have the following compositions: 23.5% Li2F2, 5% PbMoO4, 71.5% Li2MoO4 and 81.5% PbF2, 1.5% PbMoO4, 17% Li2F2 and are melted respectively at 608 and 550 deg C. According to isotherms of lead molybdate crystallization Gibbs energies (ΔGsub(T)sup(0)) of the exchange reaction and melting potentials (ΔZ) of lead molybdate in the 650-800 deg C temperature range are calculated