| 摘要 |
<p>Oxides composed of group IIA element, group III element in periodic table and copper from superconductor having a high critical temperature. These oxides can be manufacture by coprecipitating an aqueous mixed nitrate solution of elements constituting the oxides, or by sintering oxide powder or carbonate powder of these elements, or by subjecting compounds of these elements to a solid phase reaction. These oxides exhibit a high critical temperature and a high critical magnetic field when they are sintered at a temperature of 900°C or more in an oxygen gas atmosphere.</p> |
