Abstract
The dielectric and electrical properties of composites prepared by addition of two different amounts of PbZrO3 (PZO) to BiFeO3 (BFO) are discussed. The composites (1 − x)(BiFeO3)-x(PbZrO3) (x = 0.5, 0.7; i.e., 0.5BF-0.5PZ and 0.3BF-0.7PZ) were synthesized by solid-state reaction. X-ray diffraction analysis confirmed formation of composites with a rhombohedral structure at room temperature. Scanning electron microscopy revealed homogeneously distributed grains. Dielectric constants and dielectric loss increased with decreasing PZO content whereas the transition temperature shifted to higher temperature with decreasing PZO content. Hysteresis loops confirmed the ferroelectric nature of the materials. The Nyquist plot was indicative of the contribution of the bulk effect and a small contribution from the grain boundary effect. Temperature-dependent relaxation occurred for both materials. Non-Debye type electrical impedance was confirmed by asymmetric peak broadening and a spread of relaxation times. Activation energies were calculated from plots of ac conductivity as a function of temperature by linear fitting. Dc and ac conductivity increased with increasing temperature. Activation energies calculated from the complex impedance plot and from the fitted Jonscher power law were very similar, implying conduction by a similar type of charge carrier in both composites.
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Acknowledgements
The authors acknowledge financial support through DRS-I of UGC, New Delhi, India, under the SAP and FIST programme of DST, New Delhi, India, for development of research work in the School of Physics, Sambalpur University. Two of the authors, SKS and NKM, acknowledge financial support from UGC through the UGC-BSR fellowship scheme. One of the authors, BB, acknowledges the SERB under the DST Fast Track Scheme for Young Scientists (Project No. SR/FTP/PS-036/2011) New Delhi, India, and PN acknowledges CSIR for sanction of the Emeritus Scientist scheme (Project No. 21(0944)/12/EMR-II).
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Satpathy, S.K., Mohanty, N.K., Behera, A.K. et al. Dielectric and Electrical Properties of BiFeO3-PbZrO3 Composites. J. Electron. Mater. 44, 4290–4299 (2015). https://doi.org/10.1007/s11664-015-3944-9
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DOI: https://doi.org/10.1007/s11664-015-3944-9