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Solid State Formation of Superconducting Phases in the T1-Ca-Ba-Cu-O System

Published online by Cambridge University Press:  28 February 2011

T.W. Huang ,
M.P. Hung ,
T.S. Chin ,
H.C. Ku ,
S.C. Yang  and
S.E. Hsu
T.W. Huang
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, 70100, Taiwan, Rep. of China
M.P. Hung
Affiliation:
Department of Materials Engineering, National Cheng Kung University, Tainan, 70100, Taiwan, Rep. of China
T.S. Chin
Affiliation:
Department of Materials Sei. & Eng.
H.C. Ku
Affiliation:
Department of Physics National Tsing Hua University, Hsinchu, 30043, Taiwan, R.O.C.
S.C. Yang
Affiliation:
Materials R&D Center, Chung Shan Inst. of Sei. & Tech., Lung-Tang, 32526, Taiwan, Rep. of China
S.E. Hsu
Affiliation:
Materials R&D Center, Chung Shan Inst. of Sei. & Tech., Lung-Tang, 32526, Taiwan, Rep. of China
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Abstract

Differential thermal analysis (DTA) and thermal gravitometry analysis (TG A) under flowing oxygen show that the formation temperatures of the high Tc T12Ca2Ba2Cu3Ox (2223) and the low Tc T12CaBa2Cu2Ox (2212) phases lie at around 910 °C and 840 °C, respectively. The activation energies are as low as 50 kcal/mole for the 2223 phase and 35 kcal/mole for the 2122 phase. Thus the time for the formation of these phases can be within 30 minutes.

Two preparation methods were tried, and the one with Ca3BaCu3O7 as a precursor was easier to attain pure high Tc 2223 phase than that prepared directly from component oxides and carbonates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 353
Copyright
Copyright © Materials Research Society 1990

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References

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