钠米材料Fe＿2O＿3微结构的正电子寿命谱学研究  

INVESTIGATION OF MICROCONSTRUCTURE OF NANOMATERIAL Fe_2O_3 BY POSITRON LIFETIME SPECTROSCOPY

作　　者：彭郁卿[1] 王涛[1] 周诗瑶[1] 卜为 张立德[1] 

机构地区：[1]中国科学院上海原子核研究所,中国科学院核分析技术开放研究实验室,中国科学院固体物理研究所,上海师范大学

出　　处：《物理学报》1994年第7期1208-1216,共9页Acta Physica Sinica

摘　　要：用Ｘ射线衍射确定了纳米材料Ｆｅ＿２Ｏ＿３的平均粒径。测量了正电子的寿命。给出了平均粒径随退火温度的变化和短寿命成分τ＿１、中等寿命成分τ＿２以及它们的强度比Ｉ＿２／Ｉ＿１随平均粒径的变化。讨论了纳米材料Ｆｅ＿２Ｏ＿３的界面结构、平均正电子寿命τ与多普勒展宽谱Ｓ参效间的对应关系。In this paper, the mean graindiameters of nanomaterial Fe_O_3 are determined by X-ray diffraction。The measurements of positron lifetime have been performed。The annealing temperature dependence of D and the short lifetime component τ_1,intermediate lifetime component τ_2 and their intensity ratio I_2/I_1 as function of Dare given。The interface construction of nanomaterial Fe_2O_3 as well as the correspo-nding relationship between mean positron lifetime t and S-parameter of Dopplerbroadening spectrum are discussed。

关 键 词：纳米材料 氧化铁 正电子湮灭 缺陷 

分 类 号：O481[理学—固体物理]