| 发明名称 |
Chemically tailored corrosion resistant high-TC superconductors |
| 摘要 |
A corrosion resistant high temperature superconductor and a method of preparing said superconductors involving substitution of ions in the lattice to relieve stress and strain caused by mismatched bond lengths. Specific examples of such superconductors are Y1-yCayBa2-yLayCu3O7-d where O<y<1.0 and O<d<1 and YBa2-ySryCu3O7-d where 0<y<2 and O<d<1. In YBa2Cu3O7-d structure, the internal stresses estimated from the difference between the bond valence sum and the formal oxidation state for Ba and Cu ions indicate that the Ba atom is too large for Cu-O cage at oxygen stoichiometric d=0 and too small at d=1. Therefore, the Ba (1.52 ANGSTROM ) is substituted by La (1.27 ANGSTROM ) and for keeping the same oxidation state of Cu as in the prototype material the Ca (1.12 ANGSTROM ) equivalent to La replaces the Y (1.019 ANGSTROM ).
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| 申请公布号 |
US5591696(A) |
申请公布日期 |
1997.01.07 |
| 申请号 |
US19940320012 |
申请日期 |
1994.10.06 |
| 申请人 |
BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEM |
发明人 |
MCDEVITT, JOHN T.;ZHOU, JI-PING;ZHAO, JIANAI |
| 分类号 |
C01G3/00;C04B35/45;H01L39/12;H01L39/24;(IPC1-7):C04B35/505;C04B35/622;B32B18/00 |
主分类号 |
C01G3/00 |
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