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- W1980916278 abstract "Optimization of the hole concentration in (Tl/sub 0.5/Pb/sub 0.5/)Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub y/ (Tl-1223) was attempted though partial replacement of Sr/sup 2+/ by La/sup 3+/. Nine samples with nominal composition (Tl/sub 0.5/Pb/sub 0.5/)Sr/sub 2-x/La/sub x/Ca/sub 2/Cu/sub 3/O/sub y/ were prepared, with x varies from 0 to 2. Magnetization measurements as a function of temperature showed that the transition temperature increased with increasing La content. These measurements also showed an increase of the diamagnetic signal as La was increased. X-ray diffraction patterns of the samples showed that La addition improved the phase purity of Tl-1223 for low level La substitution (x/spl les/0.03). Formation of impurity phases and a phase transformation were also observed for high La contents. The microstructure appearance of the samples with different La content was different. Samples with x values 0.5, 1 and 2, were very brittle and the pellets dissociated into fine powder in one week time. These results will be discussed in terms of changes in the charge carrier concentration in the Cu-O planes of the originally overdoped Tl-1223 high temperature superconductors." @default.
- W1980916278 created "2016-06-24" @default.
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- W1980916278 date "2000-03-01" @default.
- W1980916278 modified "2023-09-24" @default.
- W1980916278 title "Effect of La/sup 3+/ substitution for Sr/sup 2+/ on the phase formation, structure and properties of (Tl/sub 0.5/Pb/sub 0.5/)Sr/sub 2/Ca/sub 2/Cu/sub 3/Oy compounds" @default.
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- W1980916278 doi "https://doi.org/10.1109/77.828443" @default.
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