PURPOSE: To obtain the superconducting ceramics having the high critical temp. by using a double oxides composed of copper and transition metal at the time of producing the rare earth element-alkaline earth metal-copper-oxide superconductor.
CONSTITUTION: The double oxides composed of the copper and the transition metal element selected from groups IVB, VB, and VIB, for example, Cu2WO4, CuNb2O4, etc., are used as the raw material compd. of the copper at the time of producing the high-temp. superconducting ceramics of the rare earth element- alkaline earth metal-copper oxide system. The respective raw material compds. are so ground and mixed as to attain the element ratios of the rare earth element:alkaline earth metal:transition metal element:copper=1:0.8-1.2:1.6-2.4:3. This mixture is temporally calcined at 700-950°C and the calcined powder is sintered at 750-950°C, by which the high-temp. superconducting ceramics having ≥100K Tc is obtd.
FUJII KAZUHIRO
DAIMON HIROSHI
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