Abstract
The subsolidus area of Cs2MoO4-Al2(MoO4)3-Zr(MoO4)2 system was studied by X-ray powder diffraction. Two new molybdates with component molar ratios of 1: 1: 1 (S1) and 5:1:2 (S2) were synthesized for the first time. The crystallographic parameters of the 5:1:2 compound were determined. Solution- melt crystallization and spontaneous nucleation yielded crystals of new 1:1:1 cesium aluminum zirconium molybdate Cs(AlZr0.5)(MoO4)3. Its formula unit and crystal structure were refined by X-ray diffraction (1592 reflections, R=0.0249). Trigonal crystals: a=12.9441(2) A, c=12.0457(4) A, V=1747.86(7) A3, Z = 6, space group R \( \bar 3 \). The three-dimensional combined framework of this structure is formed by MoO4 tetrahedrons linked through common vertices to (Al,Zr)O6 octahedrons. Cesium atoms occupy large cavities of the framework. Crystallographic position M(1) is occupied by randomly distributed Al3+ and Zr4+ cations.
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