PURPOSE: To obtain an oxide superconducting material having high critical current density even under high magnetic field by melting an oxide raw material containing Tl, Bi, Sr, Ca and Cu at a specific ratio and then gradually cooling the melted raw material at a prescribed cooling speed.
CONSTITUTION: When a superconducting oxide single crystal containing Tl, Bi, Sr, Ca and Cu is produced, an oxide raw material containing Tl, Bi, Sr, Ca and Cu at a ratio of (Tl+Bi):Sr:Ca:Cu of 2:2:(n-n):n (Tl/Bi>1, n is 3-7) is melted at 950-1050°C and then gradually cooled at a cooling rate of 1-20°C/hr. The above-mentioned material is an oxide superconducting material containing a compound oxide of a composition expressed by the formula. In the composition expressed by the formula, A is at least one kind of element among In, Sn, Sb, Pb, Y and lanthanoid elements; x, y, z, p, q, v and w represent ratio of each element and are numbers satisfying these formulas: 0≤x<1, 0.5≤y≤4.0, 0.5≤z≤4.5, 0≤p≤0.6, 0.5≤q≤3.0 and 1.0≤v≤5.5.
| JPS63315560 | THERMISTOR PORCELAIN COMPOSITION |
| WO/2018/166831 | CYLINDRICAL TITANIUM OXIDE SPUTTERING TARGET AND PROCESS FOR MANUFACTURING THE SAME |
| JPH01153567 | PRODUCTION OF SUPERCONDUCTOR |
OKURA KENGO
KOTANI TOSHIHIRO
