الفهرس 
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Abstract
The first discovery of 35 K superconductivity in La - Ba - Cu - O LBCO system by bednorz and Muller 1 stimulated worldwide activity in searching for new high temperature superconductors elemental substitution has proved to be most effective in raising transition temperature Tc by the beginning of 1987 substitution of Sr for Ba in LBCO has Produced 40 K superconductivity at the atmospheric pressure 2, 3 and up to 52 K under high pressure.