P. Kour

Effect of Sr doping on electrical properties of lead zirconate titanate nanoceramics

ABSTRACT Pb1-xSrxZr0.52Ti0.48O3 (PSZT) with x = 0–10 mole % were prepared by sol-gel process. X-ray diffraction (XRD) patterns show both rhombohedral and tetragonal crystal symmetries. Increase in lattice strain due to Sr incorporation results in enhanced dielectric constant and piezoelectric co-efficient (d33).With the increase in temperature relaxation time increases from 10−6 sec to 10−7 sec and spreading factor increases from 0.21 (±0.05) to 0.26 (±0.05) for 10 mole % PSZT. Also, the maximum remanent electric polarization and coercive electric field of 13.64 µC/cm2 and 15.97 kV/cm respectively have been observed for 10 mole % samples.

Effect of strontium substitution on dielectric constants of PZT nanocrystalline ceramics

The influence of soft isovalent doping at Pb2+ site of PZT had been extensively investigated for various specific properties required in either thin films or bulk ceramics. In this report, we have studied the influence of isovalent Sr2+ substitution on A site of PZT on dielectric constant and impedance spectroscopy. The samples with the stoichiometry Pb1-xSrx(Zr0.52Ti0.48)O3, x = 0.02, 0.06 & 0.1 were synthesized by the sol gel method. Temperature dependent dielectric study has been carried out in the temperature range of 35 °C to 450 °C. The impedance study shows NTCR properties in the sample.

Enhance of ferroelectric properties by modifying Pb2+ side by Mg2+ in PZT (52/48) ceramics

Magnesium substituted lead zirconate titanate Pb1−xMgxZr0.52Ti0.48O3 (x=0.02, 0.04, 0.06 & 0.08) have been prepared by the sol-gel method. The crystal structure and phase purity of the samples were studied by powder X-ray diffraction (XRD) technique. The ferroelectric hysteresis loop measurements were carried out at room temperature using ferroelectric loop tracer over a field range of 4.5kv/cm. The saturation polarization and coercivety and remnant polarization increase with the increase in magnesium concentration. The piezoelectric constant was measured by varying the polling field was found to be decrease with the increase in concentration of magnesium.

Study of ferroelectric properties on PVDF-PZT nanocomposite

ABSTRACT PVDF with 0, 2, 4, 6, 8, 10 mole% of PZT has been prepared by the solvent casting method. Prominent β phase has been observed from the XRD, FT-IR and Raman studies. The polarization of these samples starts at high field of 100 kv/cm and it increases with the increase in applied electric field. The 4 mole% PZT doped PVDF shows maximum polarization and high coercive field. The coercive field also increases with the increase in applied electric field. Hence, 4 mole% PZT doped PVDF composites can be used in high electric fields applications.

Study of dielectric properties of Ca doped barium titanate ceramics

Ba1-xCax Zr0.52Ti0.48 O3 ceramics was prepared by sol gel method. The crystallite size was in nano scale range. The dielectric constant was increased with increase in Ca2+ concentration in the sample. The dielectric loss was decreased with increase in ca concentration in the sample. The ac conductivity of the sample was increased with increase in Ca2+ concentration in the sample. The ac conductivity of the sample follows Johnscher power law. AC conductivity analysis shows that the interactions between neighbouring dipoles were decreased with the increase in Ca2+ concentration in the sample.