1. Synthesis and electrical transport of Hg0.8Tl0.2Ba2Cu3O8+σ
- Author
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J. S. Kim, Seung-Ki Joo, Y.W. Park, Duksoo Kim, and H.R. Kang
- Subjects
Superconductivity ,Materials science ,Annealing (metallurgy) ,Two step ,Analytical chemistry ,Energy Engineering and Power Technology ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Sample quality ,Electrical transport ,Electrical resistivity and conductivity ,High pressure ,Seebeck coefficient ,Electrical and Electronic Engineering - Abstract
Hg 0.8 Tl 0.2 Ba 2 Ca 2 Cu 3 O 8+σ compound was synthesized by using the high-pressure-high-temperature technique in a belt type high pressure furnace. The applied pressure is 18 kbar and the temperature is raised to about 800 ≈ 900°C during the sample synthesis. We found that the cooling process in synthesizing the precursor has a significant effect on the sample synthesis condition and sample quality. By using the furnace - cooled precursor in oxygen atmosphere, we could get the nearly single phase of Hg 0.8 Tl 0.2 Ba 2 Cu 3 O 8+σ with the two step annealing process. The effect of Tl substitution for Hg on the superconducting properties was investigated by measuring the resistivity and the thermoelectric power as a function of temperature.
- Published
- 2000
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