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- W197943259 abstract "We have investigated the chemical homogeneity, by means of X-rays diffraction and X-ray microanalysis, of various high T c superconductors prepared by oxidation of rapidly quenched alloy precursors. In the case of Eu-Ba-Cu alloy, an essentially amorphous phase is obtained after quenching and the resulting superconductor EuBa 2 Cu 3 O 7 has a more uniform microstructure and a better chemical homogeneity, compared with that of conventional ceramic. This leads to a substantial increase in critical current. For Bi-Sr-Ca-Cu system, the oxidized product contains some impurity phases due to the formation of an intermetallic compound with high melting point (>1200°C) during the alloy preparation stage. The addition of silver in this system is found to be helpful to obtain a homogeneous precursor, by lowering its melting point and through the formation of very fine (~30 nm) microcrystalline structure. A micro-composite Ag/Bi-Sr-Ca-Cu-O superconductor is obtained after oxidation, and its critical current is slightly increased compared with the previous one without Ag addition." @default.
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- W197943259 date "1991-01-01" @default.
- W197943259 modified "2023-09-23" @default.
- W197943259 title "SYNTHESIS OF HOMOGENEOUS HIGH Tc SUPERCONDUCTORS BY OXIDATION OF RAPIDLY QUENCHED ALLOY PRECURSORS" @default.
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- W197943259 doi "https://doi.org/10.1016/b978-0-444-88825-9.50041-7" @default.
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