Ambient/low pressure synthesis and fast densification to achieve 55 K T-c superconductivity in NdFeAsO0.75F0.25

作者：Kursumovic A^*; Durrell J H; Chen S K; MacManus Driscoll J L

来源：Superconductor Science and Technology, 2010, 23(2): 025022.

DOI：10.1088/0953-2048/23/2/025022

55 K superconductivity in NdFeAsO0.75F0.25 is demonstrated using two stage, ambient pressure synthesis (APS) with two zone temperature control for maintaining the As vapour pressure. The density of the APS material was subsequently increased by spark plasma sintering (SPS) for short times (60 s) at relatively low pressures (< 80 MPa), giving density values above 95% of the theoretical value while maintaining very high slopes of upper critical field of up to 8.5 T K-1. The APS + SPS method developed here is ideal for fabricating tapes in a rapid and safe way.

• 出版日期2010-2