物理学报2011，Vol.60Issue(6)：712-717,6.
纳米Fe3O4颗粒的正电子湮没谱学研究
Positron annihilation spectroscopy study on the Fe3O4 nanoparticle
摘要
Abstract
The positron annihilation lifetime spectroscopy(PALS) , coincidence doppler broadening spectroscopy (CDBS) and x-ray diffraction ( XRD) are measured in the Fe3 O4. The aim is to ascertain how pressure and annealing temperature influence the properties of Fe3 O4 nanoparticles, such as the change of phase, electronic structure, defect and distribution of electronic momenta. The results indicate that the defect concentration of Fe3 O4 nanoparticles increases with the increase of pressure, but the phase and defect type do not change. The phase type, and the guantity and type of defect change significantly as the annealing temperature varies. The phase transition of the Fe3 O4 wafer pressed in atmosphere occurs when the annealing temperature is between 350 ℃ and 500 ℃. The grain size of Fe3 O4 increases with the increase of the annealing temperature, which leads to the decrease in boundary defect and parameter S but it is contrary to the ratio curve.关键词
正电子/Fe3O4/寿命谱/多普勒展宽谱Key words
positron/ Fe3 O4/ lifetime spectroscopy/ Doppler broadening spectrum引用本文复制引用
许红霞,郝颖萍,韩荣典,翁惠民,杜淮江,叶邦角..纳米Fe3O4颗粒的正电子湮没谱学研究[J].物理学报,2011,60(6):712-717,6.基金项目
国家自然科学基金重点项目(批准号:10835006)、国家自然科学基金(批准号:10975133).教育部"211工程"专项基金和中国科学院知识创新工程重要方向性项目资助的课题. （批准号:10835006）
