Effect of temperature and pressure on mixed oxide solid solutions

[Display omitted] •One of the most promising materials with negative coefficient of thermal expansion is ZrW2-xMoxO8 (0 ≤ x ≤ 2) system.•ZrW2-xMoxO8 (0 ≤ x ≤ 2) system use as temperature compensators for metal, ceramic and polymer composites.•Investigating a system under the influence of pressure and temperature is extremely important for creating durable structures.•The use of solid solutions in comparison with pure phases is much more profitable since phase transitions occur at higher temperatures and pressures. A hydrothermal synthesis of ZrW2-xMoxO8 (0 ≤ x ≤ 2) from the corresponding precursors is reported in this paper. High-temperature and high-pressure data are presented for the sample with x = 1.6. An increase in temperature initiates the phase transition from tetragonal precursor to orthorhombic-ZrW2-xMoxO8 (x = 1.6) with the subsequent formation of cubic and trigonal phases. The thermolysis parameter of the disordered cubic ZrW2-xMoxO8 (x = 1.6) phase is 803 K, and the coefficient of thermal expansion is α = -4.6∙10–6 K−1. Data on ZrW2-xMoxO8 (x = 1.6) structure as a function of pressure are obtained for the first time. Pressure-induced changes from cubic to orthorhombic ZrW2-xMoxO8 (x = 1.6) phase at 1.38 GPa are observed. The sample amorphization is irreversible during decompression.