Abstract:La2Zr2O7 powder was prepared with combustion method with La2O3, Zr(NO3)4 and glycine as raw materials. La2Zr2O7 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 La2Zr2O7 powders were studied. The X-ray diffraction pattern of La2Zr2O7 powder after heat treatment at 600 ℃ has one diffraction peak, and the diffraction peak is quite broad, therefore, the crystal structure of the La2Zr2O7 powder is semi-crystal structure. With the increase of heat treatment temperature, diffraction peaks become gradually sharp and increase. The crystal structure of the La2Zr2O7 powders after heat treatment in 750~800 ℃ are pyrochlore structure. Analysis results of IR spectra of La2Zr2O7 powders after heat treatment in 650~750 ℃ show that the crystal structure of the La2Zr2O7 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 La2Zr2O7 powders show that the crystal structure of the La2Zr2O7 powders are stability in 120~1 600 ℃.
[1] Derelioglu Z, Carabat A L, Song G M, et al. Journal of the European Ceramic Society, 2015, 35: 4507. [2] Jason S, Van S, Stephan K, et al. Acta Materialia, 2015, 96: 133. [3] Schmitt M P, Amarendra K R, Zhu D M, et al. Surface and Coatings Technology, 2015, 279: 44. [4] LIU Xiao-zhen, XIONG Li-ping, LIU Xiao-zhou, et al(刘小珍, 熊莉萍, 刘小舟, 等). Spectroscopy and Spectral Analysis (光谱学与光谱分析), 2014, 34(4): 1109. [5] Miller R A. Journal of Thermal Spray Technology, 1997, (6): 35. [6] Cao X Q, Vassen R, Stoever D. Journal of the European Ceramic Society, 2004, 24: 1. [7] Ma W, Li P, Dong H Y, et al. Journal of Thermal Spray Technology, 2014, 23: 154. [8] Saravanan S, Hari S G, Jayaram V, et al. Surface and Coatings Technology, 2008, 202: 4653. [9] Garbout A, Kallel K N, Ferid M. Journal of Luminescence, 2015, 168: 359. [10] Liu Z G, Hu K J, Jin Y J, et al. Journal of Alloys and Compounds, 2015, 653: 122. [11] Klobes B, Finkeldei!S, Rohrig W, et al. Journal of Physics and Chemistry of Solids, 2015, 79: 43. [12] Mohapatra M, Rajeswari B, Hon N S, et al. Journal of Luminescence, 2015, 166: 1. [13] Wang X, Jiang K, Zhou L. Journal of Nuclear Materials, 2015, 458: 156. [14] Klobes B, Finkeldei S, Rohrig W, et al. Journal of Physics and Chemistry of Solids, 2015, 79: 43. [15] Zhang Y H, Xie M, Zhou F, et al. Materials Research Bulletin, 2015, 64: 175. [16] Tong Y P, Wang Y P, Yu Z X, et al. Materials Letters 2008, 62: 889.