Microstructure and property of gadolinium tungstate ceramic fabricated via pressureless sintering

Gd2WO6 precursor powder was prepared from Gd2O3 and WO3 via a high-temperature solid-state reaction. Gd2WO6 ceramics with relative densities more than 95% were prepared by secondary sintering method. The effects of temperature on Gd2WO6 phase composition, microstructure, and properties of the ceramic materials were studied. The main reaction temperature of Gd2O3 and WO3 is 1050 & DEG;C. However, XRD results show that the reaction already occurs below 1050 & DEG;C. The prepared precursor powder contains W17O47. After secondary sintering, local segregation was observed by TEM, and two phases of solid solutions were formed. Gd2WO6 and Gd2(WO4)3. W17O47 dissolved into Gd2WO6 to form Gd2(WO4)3. With increasing sintering temperature, the lattice parameters of Gd2WO6 changed, the overall trend became smaller, and the theoretical density gradually increased. FTIR measurements showed that the ceramic has exxellent luminescence properties and is expected to be used in solid-state light emitters.

Automated summary

Gd2WO6 precursor powder was prepared from Gd2O3 and WO3 via a high-temperature solid-state reaction. Gd2WO6 ceramics with relative densities more than 95% were prepared by secondary sintering method. The effects of temperature on Gd2WO6 phase composition, microstructure, and properties of the ceramic materials were studied.