  The substitution of Re into Bi2O3 allows stabilization of the d- Bi2O3
structure by additional substitution of lutetium ion to give phase of
composition Bi12.5Lu1.5ReO24.5. The phase was synthesized for the first time.
Structural analysis performed by neutron diffraction showed that space group
was Fm3m with lattice parameter a = 5.5591(2) {\AA}. The phase has been found
to show high ion conductivity at moderate temperature. The conductivity was
measured in the temperature range of 600-800 K. The conductivity of
Bi12.5Lu1.5ReO24.5 at 800 K is the same as the conductivity of BiCuVOx,
Bi12.5Ln1.5ReO24.5 (Ln = Eu, La, Nd) phases. In this connection the
Bi12.5Lu1.5ReO24.5 phase offers excellent potential for moderate temperature
application.
