Evolution of tetragonal phase in the FeSe wire fabricated by a novel chemical-transformation PIT process
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 500C produced wire-core transformation from hexagonal to tetragonal phase. Furthermore the hexagonal phase completely transformed into the tetragonal phase by annealing at 1000C. With increasing annealing temperature, the superconducting property was dramatically improved, associated with the evolution of the tetragonal phase.
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