Combustion Synthesis of Nanosized Y2Hf2O7 and Lu2Hf2O7 Powders
Y2Hf2O7 and Lu2Hf2O7 precursor powders are prepared by nitrate solution combustion method with various fuels at 450°C, respectively. Phase evolution of the synthesized powders was determined by X-ray diffraction (XRD) techniques. Single-phase cubic Y2Hf2O7 and Lu2Hf2O7 crystalline powders were obtained by calcining the resultant combustion ash at 800°C for 2h. By controlling the pH of the nitrate solution, the type of fuel and the ratio of fuel/nitrate, nanosized powders can be obtained. The crystallite size of resultant powders is much related to the combustion flame temperature, which can be controlled by controlling the type of fuel and adjusting the fuel-to-oxidizer ratio. The influence of the ratio of reactants and the type of fuel on the properties of the final products was investigated. The crystal size and morphology were analyzed by TEM.
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
Y. K. Liao et al., "Combustion Synthesis of Nanosized Y2Hf2O7 and Lu2Hf2O7 Powders", Key Engineering Materials, Vols. 280-283, pp. 643-646, 2005