Dielectric, electrical and impedance study of single perovskite Pb(Ni1/3Mn1/3W1/3)O3
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A multiferroic material Pb(Ni1/3Mn1/3W1/3)O3 with ferroelectric and ferromagnetic properties at room temperature is designed for multifunctional applications. A orthorhombic perovskite crystal structure has been assigned for the present perovskite according to the X-ray diffraction patterns. At 1 kHz, dielectric constant (ɛr) increases from 1655 at 298 K to its first maximum 3514 at 457 K referred as magnetic transition. The high values of ɛr in the low frequency range show better dispersion, and with the increase in frequency, a gradual decrease in the ɛr values was observed. The contribution of grain and/or electrode/interface effects in the resistive/capacitive properties was ascertained by the Nyquist plots. An equivalent circuit has been suggested consisting of resistive and capacitive components (R, C, Q) estimates the bulk (grain) and grain boundary resistance and capacitance. The activation energy was found to be greater than 0.2 eV, supporting the conduction mechanism due to hopping of charge carriers.
KeywordsCeramics Multiferroic material Solid-state reaction Dielectric response Electrochemical impedance spectroscopy
PACS Nos.61.05.C− 77.22.Gm
The present work is funded by the UGC-DAE-CSR, Mumbai (CRS-M-297), and the authors would like to thank Dr. P. D. Babu of UGC-DAE-CSR, Mumbai, and Dr. Raja Kishora Lenka of Powder Metallurgy Division, BARC, Mumbai, for their valuable suggestions and some characterization.
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Conflict of interest
The authors of the present paper declare that there is no conflict of interest.
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