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Promotion of phase transformation and single-phase formation in silver-doped Tl–Ba–Ca–Cu–O superconducting thin films

Published online by Cambridge University Press:  31 January 2011

Horng-Show Koo  and
Tseung-Yuen Tseng
Horng-Show Koo
Affiliation:
Department of Electronics Engineering and Institute of Electronics, National Chiao-Tung University, Hsinchu, 300, Taiwan, Republic of China
Tseung-Yuen Tseng
Affiliation:
Department of Electronics Engineering and Institute of Electronics, National Chiao-Tung University, Hsinchu, 300, Taiwan, Republic of China
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Abstract

Phase transformation and physical characteristics of the spray-pyrolyzed Tl–Ba–Ca–Cu–O superconducting films with 3 mol% silver dopant have been studied using electrical resistivity, x-ray diffraction, and scanning electron microscopy. The major phase formed in the resultant film, annealed at a temperature of 885 °C for 3 min, was found to be the nearly single-phase, high-Tc Tl2Ba2Ca2Cu3Oy (Tl-2223). The multiple phase of Tl2Ba2Ca2Cu3Oy and TlBa2Ca2Cu3Oy (Tl-1223) appeared at annealing temperatures lower and higher than 885 °C. It was also observed that Ag dopant effectively reduces normal resistivity at 300 K and enhances the phase transformation of single-Tl-layer Tl-1223 to double-Tl-layer Tl-2223 phases and further helps to form the nearly single-phase Tl-2223 within a short duration. Critical transition temperature (Tc,zero) and current density (Jc, 77 K, 0 Tesla) of the best resultant film were shown to be 123 K and 5.7 × 104 A/cm2, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 1727 - 1731
Copyright
Copyright © Materials Research Society 1999

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