TY - JOUR
T1 - α-feas-free SmFeAsO1-xFx by low temperature sintering with slow cooling
AU - Fujioka, Masaya
AU - Denholme, Saleem J.
AU - Ozaki, Toshinori
AU - Okazaki, Hiroyuki
AU - Deguchi, Keita
AU - Demura, Satoshi
AU - Hara, Hiroshi
AU - Watanabe, Tohru
AU - Takeya, Hiroyuki
AU - Yamaguchi, Takahide
AU - Kumakura, Hiroaki
AU - Takano, Yoshihiko
PY - 2013/9/1
Y1 - 2013/9/1
N2 - 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.
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.
KW - Bulk
KW - Iron-based superconductor
KW - Low temperature sintering
KW - Slow cooling
KW - SmFeAsOF
KW - Superconductivity
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U2 - 10.7566/JPSJ.82.094707
DO - 10.7566/JPSJ.82.094707
M3 - Article
AN - SCOPUS:84883273891
VL - 82
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 9
M1 - 094707
ER -