Dielectric relaxation behavior and electrical conduction mechanism in polymer-ceramic composites based on Sr modified Barium Zirconium Titanate ceramic

Abstract

In this paper, we report the dielectric relaxation behavior and electrical conduction mechanism of Sr modified Barium Zirconium Titanate, (Ba 1-x Sr x Zr 0.1 Ti 0.9 O 3 (x0 0.1, 0.2, 0.3)) (BSZT) ceramic in the polyvinyl alcohol (PVA) matrix. The single phase BSZT ceramics are prepared by the conventional solid state route and are added to the polymer matrix at 25:75 volume percentage. Surface morphology of polymer ceramic composite identifies the uniform distribution of the ceramic particles in the polymer matrix. Dielectric and tangent loss spectrum of the composites indicates the distribution of relaxation time. Electric modulus analysis shows the relaxation peaks of bulk and interface properties, which follows the Arrhenius law. The ac conductivity spectrum of pure PVA obeys Jonchers power law and polymer composites obey the double power law which conduction mechanisms are explained by Jump Relaxation Model. The activation energy varies from the relaxation to conduction mechanism indicates that the different charge contributions are involved in both the processes.

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“…The s value for h-MoO 3 lies in the range of 0.72 to 0.79 (Figure S15) and increases with temperature, which suggests that h-MoO 3 is a type of ion-conducting solid and that the conduction takes place through a small polaron hopping (SPH) process. The high values of s (0.99 to 0.79) and its decreasing nature with increasing temperature in α-MoO 3 correspond to a correlated barrier hopping (CBH) process. − …”

Analysis of the dielectric relaxation and ac conductivity behavior of polyvinyl alcohol‐cadmium selenide nanocomposite films

“…Polyvinyl alcohol‐carbon nanotube (CNT) based composites have also been reported to be promising materials having interesting magneto transport properties . Apart from these, electrical properties of PVA/Barium Zirconium Titanate polymer ceramic composites and polymer – Sr modified Barium Zirconium Titanate ceramic has also been studied by Senthil et al . Group II‐VI nanocrystals are also equally important because of their promising applications in the field of electronics and optoelectronics.…”

Structural and Electrical Properties of Sprayed In2S3 Films on ITO/Glass Substrate

“…It was detectable that the values of activation energies deduced from relaxation time in the regions (I) and (II) are near to the values estimated from conductance spectrum, which indicates that transport property is owing to hopping mechanism [40]. Besides, the activation energy of the relaxation process (region III) is higher than that of the conduction mechanism, suggesting that the relaxation process does not govern the conduction mechanism [41]. Indeed, the all types of carriers contributed to the conduction at low temperatures, cannot contribute to the relaxation process [42].…”