Effect Of Starting Materials On The Critical Parameters Of Superconducting Tl-Ca-Ba-Cu-O Compounds
CRYOGENICS(1991)
摘要
Using different batches of starting materials (samples 1, TINO3, CaO, Ba2Cu3O5; II, TINO3, CaO, BaO, CuO; III, TINO3, CaO, Ba(NO3)2, CuO; IV, TINO3, CaO, BaCuO2; V, TINO3, CaO, Ba(NO3)2, CuO, O2) and the same heat treatment process, high T(c) superconducting systems of nominal composition TICaBaCuO4.5 were prepared. Different superconducting phases were formed depending on the starting compounds used. Specimens I and IV had a single-phase (2,1,2,2) character. In samples II and III the dominant (2,1,2,2) phase was accompanied by (2,0,2,1) and by (1,2,2,3) and (2,2,2,3) phases in small quantity, respectively, while specimens V can be characterized by the existence of CuO and Cu2O beside the chief (2,1,2,2) phase. The superconducting properties were affected by starting materials, which manifests itself in the difference in onset and critical temperatures, lower and upper critical magnetic fields, paramagnetic limits, coherence length, penetration depth and Ginzburg - Landau parameter of specimens of different kinds. Due to the weak coupling created by interstitial material, different intergrain, intergrain and direct transport critical currents were determined, depending on the type of samples. The main aim of this work was to compare the experimental data with the corresponding theories to draw conclusions on the role of the starting compounds.
更多查看译文
关键词
HIGH TC SUPERCONDUCTIVITY, MATERIALS CHARACTERIZATION, STARTING MATERIALS
AI 理解论文
溯源树
样例
![](https://originalfileserver.aminer.cn/sys/aminer/pubs/mrt_preview.jpeg)
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要