Interactions in the subsolidus region of the Na2MoO4 - NiMoO4 - R2 (MoO4)3, R - Cr, Fe

Phase relations have been investigated in the subsolidus region of the Na2MoO4 - NiMoO4 - R2(MoO4)3, R - Cr, Fe systems by X-ray diffraction Na1-хNi1-хR1+х(MoO4)3, R - Cr,Fe (0 ≤ х ≤ 0.4-0.5)with the NASICON structure (space group R3c) and the NaNi3R(MoO4)5 ternary molybdates crystallizing in the triclinic crystal system (space group P1) have been obtained. A high conductivity was found in Na1-хNi1-х R1+х(MoO4)3, R - Cr,Fe (0 ≤ х ≤ 0.4-0.5) which allows one to consider this phases of variable composition as a promising solid electrolytes with sodium ion conduction.