α-FeAs-Free SmFeAsO1-xFx by Low Temperature Sintering with Slow Cooling

被引：6

作者：

Fujioka, Masaya ^{[1
]}

Denholme, Saleem J. ^{[1
]}

Ozaki, Toshinori ^{[1
]}

Okazaki, Hiroyuki ^{[1
]}

Deguchi, Keita ^{[1
,2
]}

Demura, Satoshi ^{[1
,2
]}

Hara, Hiroshi ^{[1
,2
]}

Watanabe, Tohru ^{[1
,2
]}

Takeya, Hiroyuki ^{[1
]}

Yamaguchi, Takahide ^{[1
]}

Kumakura, Hiroaki ^{[1
]}

Takano, Yoshihiko ^{[1
,2
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[2] Univ Tsukuba, Tsukuba, Ibaraki 3050001, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 09期

基金：

日本学术振兴会; 日本科学技术振兴机构;

关键词：

SmFeAsO1-xFx; iron-based superconductor; bulk; low temperature sintering; slow cooling; superconductivity; SUPERCONDUCTIVITY;

D O I：

10.7566/JPSJ.82.094707

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperature sintering with slow cooling. SmFeAsO1-xFx is sintered at 980 degrees C for 40 h and cooled slowly down to 600 degrees 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 57.8K 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 degrees 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.

引用

页数：5

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