  The effect of changes of the Nb content and annealing on charge vs. voltage
and current vs. voltage characteristics of SrBi2(Ta,Nb)2O9 film was studied
theoretically and experimentally. Theoretical modeling, which takes into
account the mobile charged donors impact on the features of charge vs. voltage
and current vs. voltage characteristics of ferroelectric semiconductor films,
revealed the changes of conductivity value and ferroelectric parameters. The
results of theoretical analysis and experimental results are in qualitative
agreement.
