| 摘要 |
PURPOSE:To obtain the title composition with low content of toxic Tl, capable of continuously controlling its superconductivity transition temperature and also giving sharp superconductivity transition by mutually mixing each powder of Tl2O3, BaO, CaO, Y2O3 and CuO at specified ratio followed by press forming and then by heat treatment of the resulting form at specified temperature. CONSTITUTION:Each powder of Tl2O3, BaO, CaO, Y2O3 and CuO is weighed so as to result in a composition ratio of the formula (0.1<=x<=0.8) followed by mutual mixing. The resultant mixture is then put to press forming followed by heat treatment of the resulting form at 875-915 deg.C, thus obtaining the objective oxide superconductor composition of the formula. This composition can continuously control its superconductivity transition temperature through controlling the x value and also gives sharp superconductivity transition; therefore, being suitable in the form of e.g., a thermosensor. Wrapping the press form with a gold leaf in sintering will further improve the superconducting characteristics of said composition. |
