Bi2Sr2Ca2Cu3Ox超导体的低温内耗和相变的研究  

LOW TEMPERATURE INTERNAL FRICTION AND PHASE TRANSITION IN LOW TEMPERATURE FOR Bi_2Sr_2Ca_2Cu_3O_x SUPERCONDUCTOR

作　　者：何思明[1] 林天时[1] 唐林昌 陈志学[2] 吉晓洋[2] 

机构地区：[1]四川大学材料科学系,成都610064 [2]四川大学中心实验室,成都610064

出　　处：《低温物理学报》1991年第3期182-185,共4页Low Temperature Physical Letters

摘　　要：用倒扭摆和DSC研究了Bi_2Sr_2Ca_2Cu_3O_x 超导体在温度100K 至300K 范围内的内耗和相变.发现有五个内耗峰分别在110K、130K、180K、190K 和210K 附近.除190K 峰外,都伴随有切变模量软化.其中180K 和210K 内耗峰明显与 DSC 的放热峰对应.认为这些内耗峰与晶格不稳、晶格参数发生跳变有关,是由类相变过程中应力感生相界面运动所引起.Internal friction and phase transition process in the Bi2Sr2Ca2Cu3Ox superconductor have been investigated from 100K to 300K by an inverted torsion pendulum and DSC.There are five internal friction peaks near 110K,130K,180K 190K and 210K,respectively.These peaks,except the 190K one,are accompanied by the softening of the shear modules.The 180K and 210K internal friction peaks correspond obviously to the exothermic peaks in DSC analysis These in-ternal friction peaks are considered to be related to different lattice parameters owing to the stress induced motion of interfaces between phases.

关 键 词：超导体 内耗 相变 高TC BISRCACUO 

分 类 号：TM262[一般工业技术—材料科学与工程]