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Jpn. J. Appl. Phys. 51 (2012) 010101 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Selected Topics in Applied Physics

Centennial Anniversary of Superconductivity

Evolution of Tetragonal Phase in the FeSe Wire Fabricated by a Novel Chemical-Transformation Powder-in-Tube Process

Hiroki Izawa, Yoshikazu Mizuguchi, Toshinori Ozaki1, Yoshihiko Takano1, and Osuke Miura

Department of Electrical and Electronic Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
1National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan

(Received June 20, 2011; accepted July 30, 2011; published online December 13, 2011)

We fabricated superconducting FeSe wires by the chemical-transformation powder-in-tube (PIT) process. The obvious correlation between annealing temperature and phase transformation was observed. Annealing above 500 °C produced wire-core transformation from hexagonal to tetragonal phase. Furthermore the hexagonal phase completely transformed into the tetragonal phase by annealing at 1000 °C. With increasing annealing temperature, the superconducting property was dramatically improved, associated with the evolution of the tetragonal phase.

URL: http://jjap.jsap.jp/link?JJAP/51/010101/
DOI: 10.1143/JJAP.51.010101


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