Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process
arXiv:1106.3891 · doi:10.1143/JJAP.51.010101
Abstract
We fabricated superconducting FeSe wires by the chemical-transformation PIT process. The obvious correlation between annealing temperature and phase transformation was observed. Annealing above 500^{\circ}C produced wire-core transformation from hexagonal to tetragonal phase. Furthermore the hexagonal phase completely transformed into the tetragonal phase by annealing at 1000^{\circ}C. With increasing annealing temperature, the superconducting property was dramatically improved, associated with the evolution of the tetragonal phase.
14 pages, 6 figures
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