Superconducting Properties of Barium-Doped (Bi,Pb)2Sr2Ca2Cu3Ox Glass-Ceramics |
| |
Authors: | Takayuki Komatsu Michiko Ueta Tomohiro Ohki Ryuji Sato Kazumasa Matusita |
| |
Affiliation: | Department of Chemistry, Nagaoka University of Technology, Nagaoka 940-21, Japan |
| |
Abstract: | The Ba-doped superconducting (Bi,Pb)2Sr2- x Ba x Ca2Cu3O y and (Bi,Pb)2Sr2Ca2- x Ba x Cu3O y (0 ≦ x ≦ 1.0) were prepared by using a melt-quenching method, and the effect of Ba additions on the glass-forming ability and the crystalline phase was examined. The glass-forming ability was not improved by substitution of Ba for Sr or Ca, and particularly BaPbO3 as well as CaO was observed in the melt-quenched sample of (Bi,Pb)2SrBaCa2Cu3O y . BaPbO3 crystals were precipitated in all glass-ceramics with Ba substituted for Sr or Ca. The partial substitution of Ba substituted for Sr was effective for the formation of the high- T c phase, and (Bi,Pb)2Sr1.4Ba0.6Ca2Cu3O y glass-ceramics obtained by annealing at 830°C for 100 h exhibited superconductivity with a T c of 103 K, although BaPbO3 and the low- T c phase were still largely present. |
| |
Keywords: | superconductors glass-ceramics barium doping calcium |
|
|