作　　者： ;

机构地区： 兰州理工大学理学院

出　　处： 《甘肃工业大学学报》 2002年第4期137-139,共3页

摘　　要： 用变温X 射线衍射仪、扫描量热分析仪和热重分析仪对精心制作的Bi1.7Pb0.3Sr2Ca2Cu3Ox超导样品从室温到熔点温度进行了分析.实验发现样品在此温度范围有两个热量和重量反常.分析表明:这两个反常与晶体结构中纳米尺度上两个不同的结构块———钙钛矿块和盐岩块有关,这对认识高温超导体的结构与性能关系有重要作用. Wellprepared samples of superconductor Bi1.7Pb0.3Sr2Ca2Cu3Ox are analyzed in the range from roomtemperature to melting point with temperaturevarying Xray diffractometer, differential scanning calorimetry, and thermo gravimeter. It is found that there are both the thermal and gravitational abnormality with the samples in this temperature range. The analysis shows that these two abnormalities are related to two different crystal structural blocks in nanometer size within the crystallineperovskite and rocksalt, and this is significant for having acquaintance with the relationship between the structures and characteristics of hightemperature superconductor.

关 键 词： 超导体 热相变 纳米尺度 结构块 晶体结构 高温超导体 钙钛矿块 盐岩块

领　　域： [电气工程] [一般工业技术] [理学] [理学]