Dielectric studies and AC conductivity of piezoelectric barium titanate ceramic polymer composites

Abstract

In this work, ceramics barium titanate (BT) polymer composites were prepared with BT/polyvinyl alcohol (PVA) having a ceramic concentration of 10, 30, and 50% by weight using solution casting method. The prepared thin film samples were characterized by X-ray diffraction for phase analysis. Scanning electron microscope (SEM) studies on composite films revealed ceramic crystallites are well dispersed in the polymer matrix. The dielectric constant ( εr) and the AC conductivity at room temperature and at different frequencies (100 Hz–5 MHz) of the piezoelectric composites with different concentrations were investigated. The result shows that the dielectric constant of ceramic-PVA composites was found to increase as ceramic concentration increases and the dielectric loss tangent decreased with increasing concentration. AC conductivity of the composites increased with increasing frequency.

Cellulose derivative/barium titanate composites with high refractive index, conductivity and energy density

“…On the other hand, the low signal from high frequencies is connected with the linear increase of conductivity and attributed to the loss of energy due to polarization of chemical dipoles. Similar dielectric behavior was reported for other polymers filled with BT ceramic material (Yao et al, 2018;Ahmed et al, 2018;Beena & Jayanna, 2019). However, at 1 kHz and 2% BT in HPC, the prepared composites have slightly smaller values for ε' and ε'' than those found in literature for PVA/BT (Beena & Jayanna, 2019), polypyrrole/BT (Ahmed et al, 2018), while the permittivity of our samples is higher than that reported for polypropylene/BT (Yao et al, 2018) and PEO/CMC/BT (Morsi et al, 2019).…”

Cellulose Derivative/Barium Titanate Composites with High Refractive Index, Conductivity and Energy Density

“…Inset graph shows variation of real part of permittivity at 1 kHz with BT loading On the other hand, the low signal from high frequencies is connected with the linear increase of conductivity and attributed to the loss of energy due to polarization of chemical dipoles. Similar dielectric behavior was reported for other polymers filled with BT ceramic material (Yao et al, 2018;Ahmed et al, 2018;Beena & Jayanna, 2019). However, at 1 kHz and 2% BT in HPC, the prepared composites have slightly smaller values for ε' and ε'' than those found in literature for PVA/BT (Beena & Jayanna, 2019), polypyrrole/BT (Ahmed et al, 2018), while the permittivity of our samples is higher than that reported for polypropylene/BT (Yao et al, 2018) and PEO/CMC/BT (Morsi et al, 2019).…”

Effect of size and shape of nanofillers on electrostatic and thermal behavior of epoxy-based composites

“…Also, when the filler concentration increases, the interparticle distances are reduced, leading to the more stressed regions, 17,19,20 and it is observed from the zoomed inset in Figure 2(a) that the particle distances were even less than the size of the nanofiller when increased in the filler concentration. The particle agglomeration results differently, and this has also been reported by Paul and Sindhu 19 in the early experimental studies and Beena and Jayanna 21 for the dielectric studies on piezoelectric BaTiO 3 ceramic polymer composites.…”