高温超导YBa_2Cu_3O_(7-δ)体系的制备和超导电性研究

Study of the preparation and the superconductivity on the high T_c superconductor YBa_2Cu_3O_(7-δ) system

研究了制备工艺对YBa2Cu3O7-δ样品品质的影响,测定了YBa2Cu3O7-δ样品的电磁特性.结果表明,在预烧温度910℃,预烧时间24 h条件下烧结的混合物,压片压力为9 MPa,压力持续时间为20 s^40 s时最易压片成型;超导转变宽度和室温电阻率随烧结温度的增加而明显减小;烧结温度在920℃~940℃时样品的结构品质和超导电物理性能具有良好的稳定性和可靠性.

The influences of YBa2 Cu30T_a samlpes quality by the preparation technics are studied. The electric and the magnetic properties are performed, The results show that under the compacted condition of sintering temperautre is 910 ℃ and sintering time is 24 h, MPa for 20 s - 40 s was pressed as tablets easily. And the superconducting transform temperature decreases obviously with the increase of sintering temperature. Under the condi- tion of 920 ℃ ～ 940 ℃ ,the superconductivity and the structure of YBa2Cu3O7-δ samples have good stability and reliability.