Synthesis and studying of phase formation in systems Ag2MoO4-MmOo4 - Sc2 (MoO4), M = Zn, Ca, Ba

The method of the X-ray phase analysis has studied the possibility of a phase formation in the subsolidus area of systems with participation of molybdates of silver, bivalent elements and scandium where as bivalent metals are taken zinc, calcium and barium. The formation of triple molybdates Ag 1-xZn 1-xSc 1+x(MoO 4) 3 and AgZn 3Sc(MoO 4) 5 is established in the Ag 2MoO 4-ZnMoO 4-Sc 2(MoO 4) 3 system. It has been shown that the phase of variable composition Ag 1-xZn 1-xSc 1+x(MoO 4) 3 0.3 ≤ x ≤ 0.5 has the rhombohedra lattice (sp. gr. R 3 -c, Z = 6) and belongs to structural type of NASICON. X-ray analysis of the synthesized AgZn 3Sc(MoO 4) 5 has shown that the compound is isotopic NaMg 3R(MoO 4) 5, R = In, Al and is crystallized in the triclinic structure (sp. gr. P1 -, Z = 2). It is established that in ternary molybdate systems involving calcium and barium compounds AgM 3Sc(MoO 4) 5 и Ag 1-xM 1-xSc 1+x(MoO 4) 3, M - Ca, Ba are not formed.