  The superconducting and critical current properties of thin films of NiBi3
formed on the surface of carbon microfibers and sapphire substrates are
reported. The NiBi3 coated carbon microfibers were prepared by reacting 7
{\mu}m diameter Ni-coated (~ 80 nm) carbon fibers with Bi vapor, and thin films
on sapphire were formed by exposing electron-beam deposited Ni films (~ 40 -
120 nm) to Bi vapor. The microfibers and films show Tc = 4.3 K and 4.4
K,respectively, which were slightly higher than that reported for bulk
polycrystalline NiBi3. The critical current density (Jc) was measured below the
transition temperature and is well described by the Ginzburg-Landau power-law.
