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In this study, we report a low-temperature approach involving a combination of a sol-gel hydrothermal method and spark plasma sintering (SPS) for the fabrication of cubic phase ZrW 2-x Mo x O 8 (0.00 ≤ x ≤ 2.00) bulk ceramics. The cubic-ZrW 2-x Mo x O 8 (0.00 ≤ x ≤ 1.50) bulk ceramics were successfully synthesized within a temperature range of 623-923 K in a very short amount of time (6-7 min), which is several hundred degrees lower than the typical solid-state approach. Meanwhile, scanning electron microscopy and density measurements revealed that the cubic-ZrW 2-x Mo x O 8 (0.00 ≤ x ≤ 1.50) bulk ceramics were densified to more than 90%. X-ray diffraction (XRD) results revealed that the cubic phase ZrW 2- x  Mo  x  O 8 (0.00 ≤ x ≤ 1.5) bulk ceramics, as well as the sol-gel-hydrothermally synthesized ZrW 2- x  Mo  x  O 7 (OH) 2 ·2H 2 O precursors correspond to their respective pure single phases. The bulk ceramics demonstrated negative thermal expansion characteristics, and the coefficients of negative thermal expansion were shown to be tunable in cubic-ZrW 2- x  Mo  x  O 8 bulk ceramics with respect to x value and sintering temperature. The cubic-ZrW 2- x  Mo  x  O 8 solid solution can thus have potential applications in electronic devices such as heat sinks that require regulation of thermal expansion.

Low-Temperature Rapid Sintering of Dense Cubic Phase ZrW2−xMoxO8 Ceramics by Spark Plasma Sintering and Evaluation of Its Thermal Properties