Abstract
A new single phase orthorhombic ferroelectric ceramic Na2Pb2La2W2Ti4Nb4O30 (NPLWTN) was prepared via high-temperature solid-state reaction method. The grain morphology of the compound was analyzed by scanning electron microscopy (SEM). Studies of dielectric properties (εr and tanδ) of the compound at different frequencies (102–106 Hz) in a wide temperature range (300–700 K) showed multiple phase transitions in it. First phase transition observed at 335 K related to structural type (ferroelectric-ferroelectric) and the second one observed at 536 K is related to the ferroelectric to paraelectric. The ferroelectric property of the compound at room temperature was confirmed by polarization (hysteresis) study. Broadened dielectric peaks at low frequencies were observed above ferroelectric to paraelectric phase transition temperature (Tc). The values of exponent n(T) and pre-factor A(T) at and around Tc were obtained by the fitting ac conductivity data with Jonscher’s universal power law. From the variation of n(T) and A(T) with temperature, the strength of interaction among the charge carriers with the crystal lattice and the strength of polarisability at phase transition are observed. The activation energy of the compound in low and high temperature range suggests the conduction mechanism in the material.
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One of the authors (BB) acknowledges the financial support through DRS-I of UGC under SAP for the development of research work in the School of Physics, Sambalpur University.
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Biswal, L., Das, P.R., Behera, B. et al. Structural, dielectric and conductivity studies of Na2Pb2La2W2Ti4Nb4O30 ferroelectric ceramic. J Electroceram 29, 204–210 (2012). https://doi.org/10.1007/s10832-012-9763-y
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DOI: https://doi.org/10.1007/s10832-012-9763-y