Preparation of La(2)Zr(2)O(7) Powder with Combustion Method and Its Spectral Properties

: La(2)Zr(2)O(7) powder was prepared with combustion method with La(2)O(3), Zr(NO(3))(4) and glycine as raw materials. La(2)Zr(2)O(7) powders were characterized with ICP-AES, EDAX, XRD, IR and TG-DTA techniques, respectively. Effects of heat treatment temperature on the XRD spectra and IR spectra of La(2)Zr(2)O(7) powders were studied. The X-ray diffraction pattern of La(2)Zr(2)O(7) powder after heat treatment at 600 ℃ has one diffraction peak, and the diffraction peak is quite broad, therefore, the crystal structure of the La(2)Zr(2)O(7) powder is semi-crystal structure. With the increase of heat treatment temperature, diffraction peaks become gradually sharp and increase. The crystal structure of the La(2)Zr(2)O(7) powders after heat treatment in 750～800 ℃ are pyrochlore structure. Analysis results of IR spectra of La(2)Zr(2)O(7) powders after heat treatment in 650～750 ℃ show that the crystal structure of the La(2)Zr(2)O(7) powders after heat treatment at 750 ℃ is pyrochlore structure, and the analysis results of XRD and IR are the same. Analysis results of TG-DTG of La(2)Zr(2)O(7) powders show that the crystal structure of the La(2)Zr(2)O(7) powders are stability in 120～1 600 ℃.