  We report detailed magnetic, transport and thermodynamic properties of
metastable Rh3Bi14 single crystals in superconducting and normal state. We show
that Rh3Bi14 is nearly isotropic, weak to intermediately coupled BCS
superconductor, whereas the electronic resistivity above superconducting Tc =
2.94 K is dominated by the phonon scattering in the large unit cell with pores
filled by Bi atoms. Superconductivity is strongly influenced by the nature of
atoms that fill the voids in the crystal structure.
