  SmFeAsO1-xFx tapes were prepared using three kinds of starting materials. It
shows that the starting materials have an obvious effect on the impurity phases
in final superconducting tapes. Compared with the other samples, the samples
fabricated by SmAs, FeO, Fe2As, and SmF3 have the smallest arsenide impurity
phase and voids. As a result, these samples possess much denser structure and
better grain connectivity. Moreover, among the three kinds of samples
fabricated in this work, this kind of sample has the highest zero-resistivity
temperature ~40 K and largest critical current density ~4600 A/cm^2 in
self-field at 4.2 K. This is the highest Jc values reported so far for
SmFeAsO1-xFx wires and tapes.
