A study of the properties of ternary molybdate K5Ca0.5ZrL5(MoO4)6 using high-temperature X-ray diffraction and impedance spectroscopy

We have obtained a ternary molybdate of the composition K5Caa5ZrL5(MoO4)6 using the solid-phase reaction approach. The unit cell parameters were calculated by the Le Bail method. The compound crystallizes in the trigonal space group R 3c with the unit cell parameters a = 10.6559(1) A; c = 37.8598(4) A; V= 3722.99(8) A3, Rwp = 4.11. It was found that the compound melts incongruently at a temperature of 636°C, and the conductivity of K5Caa5ZrL5(MoO4)6 at 500°C reaches values of 1.3-10-4 S/cm, which exceeds the conductivity of similar previously studied potassium-zirconium ternary molybdates. We studied thermal deformations by high-temperature powder X-ray diffraction in the temperature range of 30-500°C. Ternary molybdate K5Ca0.5Zri.5(MoO4)6 belongs to materials with high anisotropic thermal expansion V - 44*10-6 °C-1).