南华大学学报（自然科学版）2017，Vol.31Issue(1)：96-100,5.
纳米α-Fe2O3的制备及其正电子湮没谱学研究
The Preparation and Positron Annihilation SpectroscopyStudy of Nanometerα-Fe2O3
摘要
Abstract
In this paper,the X-ray diffraction (XRD) and positron annihilation lifetime spectroscopy (PALS) measurements of iron oxide particles are performed,the structure,defects and free electron density of nanometer iron oxide particles were studied by using Jade and Lifetime software to fit the date respectively.XRD measurement results show that the iron oxide is Primitive Hexagonal,the space group is R-3c (167),and the corresponding lattice constants are the length of three basis vectors:a=b=0.530 42 nm,c=1.374 60 nm.The results of PALS measurement showed that the lifetime of the positron in the iron oxide material has three kinds,which are about 150.7 ps(τ1),333.0 ps(τ2),and 725.0 ps(τ3).The main life components are two kinds of short lifeτ1 and medium lifeτ2,respectively,corresponding to the defect types are the free volume defects of the single vacancy size and micro cavity defects,and the corresponding intensity ratio is 1.52,which indicates that the interface defects of the experimental samples are dominated by single vacancies.The PALS experiment proved that the shorter the lifetime of the positron,the greater the annihilation rate,the greater the free electron density.关键词
氧化铁/X射线衍射谱/正电子湮没寿命谱Key words
iron oxide/X-ray diffraction spectroscopy(XRD)/positron annihilation lifetime spectroscopy分类
数理科学引用本文复制引用
夏艳芳,刘敏..纳米α-Fe2O3的制备及其正电子湮没谱学研究[J].南华大学学报（自然科学版）,2017,31(1):96-100,5.基金项目
国家自然科学基金(11447231) （11447231）
湖南省教育厅项目(14B151 （）
14C0963) （）
核探测与核电子学国家重点实验室开放课题 （）
南华大学博士科研启动基金资助项目(2013XQD05) （2013XQD05）
