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A new lead free perovskite ceramics Ba(Bi0.5Nb0.5)O3 was fabricated by a conventional ceramic technique at 1185 °C and subsequent sintering at 1200 °C in air atmosphere. The XRD analysis of Ba(Bi0.5Nb0.5)O3 powder indicated the formation of a single-phase monoclinic structure. The ac conductivity data were found to obey the power law and showed a negative temperature coefficient for the resistance behaviour. The ac conductivity values were used to evaluate the density of states at the Fermi level, minimum hopping length and activation energy of the compound. The correlated barrier hopping model was found to successfully explain the mechanism of charge transport in Ba(Bi0.5Nb0.5)O3.
Computer simulation of photoexcited electron-donor D* fluorescence quenching in a rigid matrix has been performed. Three processes are assumed to occur: (1) the natural decay of D* excitation, (2) the electron transfer from D* to acceptor A, (3) migration of the excitation energy among D molecules. The effect of an external electric field F on process (2) has been included into considerations. Fluorescence decay curves calculated for various concentrations of D and the field-induced variation in the donor fluorescence intensity have been compared with respective experimental data and the results obtained from the approximate analytical calculations (hop ping model).
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