Back to Search
Start Over
α-FeAs-Free SmFeAsO1-xFxby Low Temperature Sintering with Slow Cooling
- Source :
- Journal of the Physical Society of Japan. 82:094707
- Publication Year :
- 2013
- Publisher :
- Physical Society of Japan, 2013.
-
Abstract
- We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperature sintering with slow cooling. SmFeAsO1-xFx is sintered at 980 {\deg}C for 40 hours and cooled slowly down to 600 {\deg}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 {\deg}C, 900 {\deg}C, 850 {\deg}C, 800 {\deg}C, 750 {\deg}C and 700 {\deg}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.<br />Comment: 17 pages, 7 figures
Details
- ISSN :
- 13474073 and 00319015
- Volume :
- 82
- Database :
- OpenAIRE
- Journal :
- Journal of the Physical Society of Japan
- Accession number :
- edsair.doi.dedup.....91db6672fa1383fe0866f913e9ed89a1