α-feas-free SmFeAsO1-xFx by low temperature sintering with slow cooling

Masaya Fujioka; Saleem J. Denholme; Toshinori Ozaki; Hiroyuki Okazaki; Keita Deguchi; Satoshi Demura; Hiroshi Hara; Tohru Watanabe; Hiroyuki Takeya; Takahide Yamaguchi; Hiroaki Kumakura; Yoshihiko Takano

doi:10.7566/JPSJ.82.094707

α-feas-free SmFeAsO_1-xF_x by low temperature sintering with slow cooling

Masaya Fujioka, Saleem J. Denholme, Toshinori Ozaki, Hiroyuki Okazaki, Keita Deguchi, Satoshi Demura, Hiroshi Hara, Tohru Watanabe, Hiroyuki Takeya, Takahide Yamaguchi, Hiroaki Kumakura, Yoshihiko Takano

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

We obtained amorphous-FeAs-free SmFeAsO_1-xF_x using a low temperature sintering with slow cooling. SmFeAsO_1-xF_x is sintered at 980 °C for 40h and cooled slowly down to 600 °C. The low temperature sintering suppresses the formation of amorphous FeAs, and the slow cooling introduces much fluorine into SmFeAsO_1-xFx. The superconductivity of this sample appears at 57.8 K and the superconducting volume fraction reaches 96%. To study the change of fluorine concentration during the cooling process, samples are quenched by water at 950, 900, 850, 800, 750, and 700 °C. It is found that fluorine is substituted not only at the maximum heating temperature but also during the cooling process. The low temperature sintering with slow cooling is very effective to obtain a homogeneous SmFeAsO_1-xF_x with high fluorine concentration.

Original language	English
Article number	094707
Journal	journal of the physical society of japan
Volume	82
Issue number	9
DOIs	https://doi.org/10.7566/JPSJ.82.094707
Publication status	Published - 2013 Sep 1

Keywords

Bulk
Iron-based superconductor
Low temperature sintering
Slow cooling
SmFeAsOF
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

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α-feas-free SmFeAsO_1-xF_x by low temperature sintering with slow cooling. / Fujioka, Masaya; Denholme, Saleem J.; Ozaki, Toshinori; Okazaki, Hiroyuki; Deguchi, Keita; Demura, Satoshi; Hara, Hiroshi; Watanabe, Tohru; Takeya, Hiroyuki; Yamaguchi, Takahide; Kumakura, Hiroaki; Takano, Yoshihiko.

In: journal of the physical society of japan, Vol. 82, No. 9, 094707, 01.09.2013.

Research output: Contribution to journal › Article › peer-review

Fujioka, Masaya ; Denholme, Saleem J. ; Ozaki, Toshinori ; Okazaki, Hiroyuki ; Deguchi, Keita ; Demura, Satoshi ; Hara, Hiroshi ; Watanabe, Tohru ; Takeya, Hiroyuki ; Yamaguchi, Takahide ; Kumakura, Hiroaki ; Takano, Yoshihiko. / α-feas-free SmFeAsO_1-xF_x by low temperature sintering with slow cooling. In: journal of the physical society of japan. 2013 ; Vol. 82, No. 9.

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abstract = "We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperature sintering with slow cooling. SmFeAsO1-xFx is sintered at 980 °C for 40h and cooled slowly down to 600 °C. The low temperature sintering suppresses the formation of amorphous FeAs, and the slow cooling introduces much fluorine into SmFeAsO1-xFx. The superconductivity of this sample appears at 57.8 K and the superconducting volume fraction reaches 96%. To study the change of fluorine concentration during the cooling process, samples are quenched by water at 950, 900, 850, 800, 750, and 700 °C. It is found that fluorine is substituted not only at the maximum heating temperature but also during the cooling process. The low temperature sintering with slow cooling is very effective to obtain a homogeneous SmFeAsO1-xFx with high fluorine concentration.",

keywords = "Bulk, Iron-based superconductor, Low temperature sintering, Slow cooling, SmFeAsOF, Superconductivity",

author = "Masaya Fujioka and Denholme, {Saleem J.} and Toshinori Ozaki and Hiroyuki Okazaki and Keita Deguchi and Satoshi Demura and Hiroshi Hara and Tohru Watanabe and Hiroyuki Takeya and Takahide Yamaguchi and Hiroaki Kumakura and Yoshihiko Takano",

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AU - Deguchi, Keita

AU - Demura, Satoshi

AU - Hara, Hiroshi

AU - Watanabe, Tohru

AU - Takeya, Hiroyuki

AU - Yamaguchi, Takahide

AU - Kumakura, Hiroaki

AU - Takano, Yoshihiko

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AB - We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperature sintering with slow cooling. SmFeAsO1-xFx is sintered at 980 °C for 40h and cooled slowly down to 600 °C. The low temperature sintering suppresses the formation of amorphous FeAs, and the slow cooling introduces much fluorine into SmFeAsO1-xFx. The superconductivity of this sample appears at 57.8 K and the superconducting volume fraction reaches 96%. To study the change of fluorine concentration during the cooling process, samples are quenched by water at 950, 900, 850, 800, 750, and 700 °C. It is found that fluorine is substituted not only at the maximum heating temperature but also during the cooling process. The low temperature sintering with slow cooling is very effective to obtain a homogeneous SmFeAsO1-xFx with high fluorine concentration.

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