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This article presents a study on Electromagnetic radiation (EMR) energy harvesting characteristics of lead zirconate titanate (PZT) of soft grade (SP 5 A) samples under drop weight impact load. In the present study, four samples having different diameter to thickness (d/t) ratio were used. A possible EMR energy harvesting mechanism from these samples under impact loading has been discussed. It is found that the EMR parameters viz. EMR voltage, generated EMR energy, and so on, depend on the dimension of the sample and applied mechanical energy. The sample having highest t/d2 (0.069) produces maximum EMR voltage, that is, 2.31 V. Also for the same sample, EMR parameters increase with the increase in applied mechanical energy. Also an increasing pattern of EMR energy was observed with the increase in the capacitance value of the capacitor. The results obtained suggest the possibility of using PZT as a better option for energy harvesting, sensing, and structural health monitoring applications. Also the results suggest EMR technique as an alternative option for harnessing energy from piezoelectric ceramics. [ABSTRACT FROM AUTHOR]

This work presents the impact generated energy harvesting characteristics of cement/lead zirconate titanate (Pb(Zr0.52Ti0.48)O3; PZT) composites. A soft grade PZT (SP 5 A) with ∼1 µm sized particles in an unpoled state was utilised to prepare cement/PZT composites. The experiments were performed on 28 days' water cured unpoled samples. The total cumulative volume and average pore radius are observed to decrease with PZT concentration in the composite. The values of piezoelectric coefficient and capacitance were, respectively, found to increase by 300 and 275% for cement/PZT composites consisting of 40% PZT compared to that of 5% added PZT. The impact generated voltage and energy increases significantly with increasing PZT-content. The voltage generation from cement/PZT could be because of the oscillations of dipoles and the mobility of ions in the pores of the hydrated cement. The results obtained foreshadow the prospect of utilising cement/PZT composites for energy harvesting from civil structures, structural health monitoring, and as sensors. [ABSTRACT FROM AUTHOR]

(100 − x)PVDF–(x) PZT (PVDF: Polyvinylidene Difluoride and PZT: Lead Zirconate Titanate) composite was prepared in 0–3 connectivity by the solvent casting methods. The piezoelectric co-efficient is found to be increased with the increase in PZT concentration in the PVDF matrix. It is due to the increase of β phase of PVDF as well as lattice strain in PZT. The incorporation of PZT ceramics in the PVDF matrix causes an increase in storage loss modulus of the sample. The tanδ decreases due to incorporation of PZT ceramics in the PVDF matrix. The piezoelectric and mechanical properties are found to be increased in the PVDF-PZT composite compare to that of PVDF. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]

Electromagnetic radiation (EMR) from soft and hard PZT under the drop weight impact have been studied. Due to impact the PZT undergoes a deformation wave which causes oscillations of dipoles within the PZT which give rise to electromagnetic radiation. The peak EMR voltage and the average EMR energy release rate show a linearly increasing pattern with the height of impact suggesting that these parameters could be used for monitoring excessive deformation from the structures. EMR peak voltage and average EMR energy release rate obtained from the soft PZT SP-5A are 43.42% and 53.12% higher respectively from those obtained from the hard PZT SP-4 owing to the higher resistance offered by the hard PZT to the domain switching. [ABSTRACT FROM AUTHOR]

Single phase perovskite ceramic Pb(Mg 1/4 Cd 1/12 Nb 2/3 )O 3 (PMCN) was prepared by the high temperature solid-state reaction method. Dielectric constant and loss tangent were measured over a frequency range 1 kHz to 1 MHz in the temperature region -40 to 115°C. Dielectric studies revealed the relaxor behaviour with diffuse phase transition. The frequency dependence of the temperature of the permittivity maximum (T m ) has been modeled using Vogel-Fulcher relation. The dielectric relaxation in PMCN is found to be analogous to the magnetic relaxation in spin-glass system. [ABSTRACT FROM AUTHOR]

Pb[(Mg 3/4 Zn 1/4 ) 1/3 Nb 2/3 ]O 3 (PMZN) ceramic was prepared by columbite precursor method. The structural analysis revealed the cubic phase of PMZN at room temperature. Dielectric studies show the relaxor behaviour with diffuse phase transition. The transition temperature (T m ) was found to be at 40°C at 1 kHz. The frequency dependence T m has been modeled using Vogel-Fulcher relation. The dielectric relaxation in PMZN is found analogous to the magnetic relaxation in spin-glass system. The relaxor behaviour in PMZN has also been examined through admittance spectroscopy. [ABSTRACT FROM AUTHOR]