Influence of vanadium dopant on relaxor behavior of BaBi2Nb2O9 ceramics

The article reports the successful preparation of single-phase vanadium doped BaBi 2 Nb 2 O 9 ceramics. In the first part of the paper we would like to present the results of the XRD measurements, which allows us to determine the lattice parameters. The parameters do not change, which implies that the vanadium ions ordering of the crystal structure causes the decreasing number of defects. The conclusion stays consistent with the results of dielectric and thermal stimulated depolarization currents measurements, described in the second part of the paper. The pure BBN ceramics, as well as the ones modified by vanadium, show the frequency dependence of the dielectric response typical for relaxor ferroelectrics i.e. the significant reduction of SYMBOL 101 \f "Symbol" \s 12e‘ max and shift of the corresponding temperature ( T m ) towards higher values with the frequency increase. However the vanadium substitution causes a reduction of the value of parameters describing the relaxor properties.