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We obtained amorphous-FeAs-free SmFeAsO1-xFx using a low temperaturesintering with slow cooling. SmFeAsO1-xFx is sintered at 980 {\deg}C for 40hours and cooled slowly down to 600 {\deg}C. The low temperature sinteringsuppresses the formation of amorphous FeAs, and the slow cooling introducesmuch fluorine into SmFeAsO1-xFx. The superconductivity of this sample appearsat 57.8 K and the superconducting volume fraction reaches 96 %. To study thechange of fluorine concentration during the cooling process, samples arequenched 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 atthe maximum heating temperature but also during the cooling process. The lowtemperature sintering with slow cooling is very effective to obtain ahomogeneous SmFeAsO1-xFx with high fluorine concentration.

{\alpha}-FeAs-free SmFeAsO1-xFx by low temperature sintering with slow cooling