物理学报2001，Vol.50Issue(3)：550-555,6.
金属氧化物超导陶瓷Y-123体系烧结过程与结构缺陷的正电子实验研究
STUDY OF THE SYNTHESIS PROCESS AND STRUCTURAL DEFECTS IN Y-123 SUPERCONDUCTING SYSTEMS BY POSITRON EXPERIMENT
摘要
Abstract
Using positron annihilation,X-ray diffraction and scanning electron microscopy experiments,the structural characteristics and preparation techniques for YBa2Cu3O7- δ systems are systematically studied.The results show that,for the samples sintered at 950℃,the orthorhombic disorder increases with the duration of sintering time.On the whole,with the increase of sintering temperature and time,the positron lifetime increases until it reaches a saturation value.It is proved that,under the condition of 920—950℃ for 12—72 h,the structural characteristics and superconductivity of Y-123 have good stability.The changes of defect with the sintering temperature and time are also discussed.This experimental results indicate that the positron experiment shows good stability and reliability.关键词
正电子寿命谱,YBa2Cu3O7-δ超导体,烧结过程,晶体结构分类
数理科学引用本文复制引用
陈镇平,张金仓,程国生,李喜贵,章讯生..金属氧化物超导陶瓷Y-123体系烧结过程与结构缺陷的正电子实验研究[J].物理学报,2001,50(3):550-555,6.基金项目
国家自然科学基金(批准号：19874017)资助的课题. （批准号：19874017）
