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Effects of Heat Treatments on the Properties of \hbox {SmFeAsO}_{1-x}\hbox {F}_{x} Oxypnictide Bulks Prepared via a Single-Step Route

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7 Author(s)
Majoros, M. ; Dept. of Mater. Sci. & Eng., Ohio State Univ., Columbus, OH, USA ; Kanuchova, M. ; Susner, M.A. ; Sumption, M.D.
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SmFeAsO1-xFx type oxypnictide bulks were made via a single-step synthesis. Polycrystalline bulk samples with nominal composition SmFeAsO1-xFx (x=0.35 and 0.4) were synthesized by conventional solid state reaction using the starting powders SmF3 , Sm, Fe, Fe2O3 , and high-purity As (specifically allotrope-gray arsenic). The weighed powders were thoroughly ground by hand with a mortar and pestle and pressed into pellets in an argon-filled glove box. The pressed pellets were sealed in an evacuated quartz ampoule and heat treated at 1100°C using different ramp rates to reach the reaction temperature. Magnetization vs. temperature measurements were made on the various specimens, where a maximum onset Tc of 55 K was achieved.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:21 ,  Issue: 3 )

Date of Publication:

June 2011

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