Effect of Grain Size on Phase Transformation and Photoluminescence Property of the Nanocrystalline ZrO_2 Powders Prepared by Sol-Gel Method  

作　　者：Qiong Chen Yongqin Chang Changjing Shao Jing Zhang Jun Chen Mingwen Wang Yi Long 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing [2]School of Chemistry and Biological Engineering,University of Science and Technology Beijing

出　　处：《Journal of Materials Science & Technology》2014年第11期1103-1107,共5页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.11175014);the National Basic Research Program of China (No.2009GB109004);the National Magnetic Con finement Fusion Program (No.2011GB108002)

摘　　要：Nanocrystalline zirconia （ZrO2） powders were prepared by a sol-gel process followed by annealing treatments from 500 to 1200 ℃. Phase transformation, microstructural features and photoluminescence properties were characterized by X-ray diffraction, transmission election microscopy and photoluminescence spectra, respectively. The results show that both monoclinic phase and tetragonal phase exist in the nanocrystalline ZrO2 powders at annealing temperature in the range of 500-900 ℃, and the concentration of monoclinic phase increases with increasing the annealing temperature. Tetragonal phase is totally transformed to monoclinic phase when annealing temperature is up to 900 ℃. The average grain size of the powders also increases when annealing temperature increases. Two emission peaks centered at 390 nm （named as /390） and 470 nm （named as /470） exist in the photoluminescence spectra, and the intensity ratio of /390 to /470 decreases with increasing annealing temperature. The grain size is proposed to be responsible for the phase transformation in the nanocrystalline ZrO2 powders.Nanocrystalline zirconia （ZrO2） powders were prepared by a sol-gel process followed by annealing treatments from 500 to 1200 ℃. Phase transformation, microstructural features and photoluminescence properties were characterized by X-ray diffraction, transmission election microscopy and photoluminescence spectra, respectively. The results show that both monoclinic phase and tetragonal phase exist in the nanocrystalline ZrO2 powders at annealing temperature in the range of 500-900 ℃, and the concentration of monoclinic phase increases with increasing the annealing temperature. Tetragonal phase is totally transformed to monoclinic phase when annealing temperature is up to 900 ℃. The average grain size of the powders also increases when annealing temperature increases. Two emission peaks centered at 390 nm （named as /390） and 470 nm （named as /470） exist in the photoluminescence spectra, and the intensity ratio of /390 to /470 decreases with increasing annealing temperature. The grain size is proposed to be responsible for the phase transformation in the nanocrystalline ZrO2 powders.

关 键 词：ZRO2 Nanocrystalline materials Grain size Phase transformation PHOTOLUMINESCENCE 

分 类 号：O614.412[理学—无机化学] TB383.1[理学—化学]