高压下制备高密度的Bi系超导体

High Density Bi-System Superconductor Prepared under High Pressure

1.
Institute of Physics, Academia Sinica, Beijing 100080, China;
2.
International Center for Materials Physics, Academia Sinica, Shenyang 110015, China

摘要: 首次直接用高压烧结而不必进行任何退火后处理获得超导Bi0.8Pb0.2SrCa2Ox陶瓷样品。此样品是由名义组分为Bi0.8Pb0.2SrCaCu2Ox的超导体在1.0 GPa、500 ℃处理2 h后制得的，其零电阻转变温度为97 K。以前未见报导过如此好的结果。高压下烧结的Bi0.8Pb0.2SrCaCu2Ox超导体的密度可达6.23 g/cm3（约为理论密度的95%），这比常规法制得的样品的密度（大约4~5 g/cm3）高得多。
- 高压烧结 /
- Bi系超导体
Abstract: Superconducting ceramic Bi0.8Pb0.2SrCaCu2Ox was directly obtained for the first time by means of high pressure sintering without any additional annealing. The superconductor sintered at 1 GPa and 500 ℃ for 2 h had a phase transition at 97 K (zero resistance), which was not observed before. The sintered sample reaches a density of 6.23 g/cm3 (about 95% of the theoretical density), much higher than that of the conventionally prepared samples, which usually have densities of only about 4~5 g/cm3.
- high pressure sintering /
- Bi system superconductor