[摘要]：Magnesium and fluorine codoped Sm(1-x/2)Mg(x/2)-FeAsO(1-x)F(x) (x = 0 - 0.3) superconductors were prepared by the process of mechanical alloying and subsequent rapid sintering. The transition temperature (T(c)) increases with x and reaches 53.3 K at x = 0.3, accompanied by decreased lattice parameters. Electron-type conduction in the MgF(2)-doped samples was found by Hall-effect measurements. The higher T(c) value of Sm(1-x)Mg(x/2)FeAsO(1-x)F(x) was attributed to the larger disorder and a higher internal pressure from the Sm and O sites, similar to the case of (Ln(1-x)M(x))(2)CuO(4) superconductors (where Ln is a rare-earth element and M = Ca, Sr, Ba).
