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高转变温度T_c的Y—Ba—Cu—O系超导体是目前最引人注目的超导材料。这种超导体在液氮沸点温度以上有稳定的零电阻温度T_o。对于不同的Y、Ba和Cu组分比,只要采用相应的烧结条件,均能制备出T_c>90K的超导样品。我们在实验中发现,此种体系超导体无论组分如何,均有明显的水解特性,最终失去超导电性。水解的最终生成物由X射线衍射测定决定。另外,利用计算机对超导体完全水解的温度-时间关系进行了模拟计算。我们以组分比Y:Ba:Cu=1:2:3均匀混料,在850℃下预烧4小时(h),然后磨碎并过筛,压制成直径16mm、厚度1.5mm的圆片,在960℃下通氧烧结9小时,得到
Y-Ba-Cu-O based superconductors with high transition temperature T_c are the most attractive superconducting materials. This superconductor has a stable zero-resistance temperature T_o above the boiling point of liquid nitrogen. For different Y, Ba and Cu component ratios, superconducting samples with T_c> 90K can be prepared with the corresponding sintering conditions. We found in the experiment, regardless of the composition of this system, superconductors have obvious hydrolysis properties, the ultimate loss of superconductivity. The final product of hydrolysis is determined by X-ray diffraction. In addition, the temperature-time relationship of complete hydrolysis of superconductors was simulated by computer. We uniformly mixed with a component ratio of Y: Ba: Cu = 1: 2: 3 and calcined at 850 ° C for 4 hours (h), then pulverized and sieved to form a disk having a diameter of 16 mm and a thickness of 1.5 mm , Oxygen sintered at 960 ℃ for 9 hours to obtain