Phase relations in the K2MoO4–Ln2(MoO4)3–Zr(MoO4)2 (Ln = La–Lu, Y) systems

We have studied phase relations in the K 2 MoO 4 –Ln 2 (MoO 4 ) 3 –Zr(MoO 4 ) 2 (Ln = La–Lu, Y) systems by the method of “intersecting cuts,” identified pseudobinary joins in their composition triangles, and constructed their phase compatibility diagrams. The systems have been shown to contain new ternary molybdates with the general formula K 5 LnZr(MoO 4 ) 6 (Ln = Dy–Lu and Y). The thermal characteristics of the synthesized compounds have been studied by differential scanning calorimetry in the temperature range 25–700°C. The new ternary molybdates crystallize in a trigonal structure (sp. gr. R 3 ¯ c , Z = 6).