| 摘要 |
PURPOSE:To obtain a superconductive material containing the periodic table groups IIa and IIIa elements, copper and oxygen, containing three phase consisting of phases having two body-centered cubic structures and phase having lamellar perovskite-type structure and having higher critical temperature than a conventional perovskite-type superconductive material. CONSTITUTION:A superconductive material containing the periodic table group IIa element (e.g. B or Sr), group IIIa element (e.g. Y or Sc) and O and having the following mixed state consisting of three phase is provided: The mixed state contains the first phase having body-centered cubic structure relatively rich in the periodic table group IIa element, the second phase having body- centered cubic structure relatively poor in the periodic table group IIa element compared with the first phase and the third phase having lamellar perovskite- type structure. In the aimed and above-mentioned superconductive material, temperature capable of attaining a complete superconductor having 0 electric resistance is always liquid N2 temperature (77k) or above. |
