物理学报2011，Vol.60Issue(10)：699-704,6.
Co掺杂纳米ZnO微结构的正电子湮没研究
Positron annihilation study of the microstructure of Co doped ZnO nanocrystals
摘要
Abstract
ZnO nanopowders are mechanically mixed with a certain quantity of Co3O4 nanopowders to obtain 10at.% Co doped Co3O4/ZnO composites.The nanocomposites are annealed in argon atmosphere at different temperatures between 100 ℃ and 1200 ℃.The structure and the grain size of the nanocomposite are investigated by X-ray diffraction 2θ scans.With annealing temperature increasing up to 700 ℃,Co3O4 phase gradually disappears,and ZnO grain size begins to increase significantly.After annealing at above 1000 ℃,Co3O4 phase completely disappears,and CoO phase（rock-salt crystal structure） appears.Positron annihilation lifetime measurements reveal a large number of Zn vacancies and vacancy clusters existing in the interface region of the Co3O4 /ZnO nanocomposites.These defects are gradually recovered after annealing at above 700 ℃,and their number is under the detection limit after annealing at 900 ℃.The same conclusion can be drawn from the coincidence Doppler broadening（CDB） measurements.关键词
ZnO/界面缺陷/正电子湮没Key words
ZnO/nanocomposites/interface defects/positron annihilation分类
通用工业技术引用本文复制引用
祁宁,王元为,王栋,王丹丹,陈志权..Co掺杂纳米ZnO微结构的正电子湮没研究[J].物理学报,2011,60(10):699-704,6.基金项目
国家自然科学基金 （）
国家自然科学基金国家基础科学人才培养基金（批准号：J0830310）资助的课题 （）
