| Autor: |
Kumar, H. H., Lonkar, C. M., Balasubramanian, K. |
| Předmět: |
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| Zdroj: |
Defence Science Journal; Jul/Aug2016, Vol. 66 Issue 4, p353-359, 7p |
| Abstrakt: |
Synthesis by mechanochemical activation route and optimisation for power harvesting properties of nanostructured Pb0.98La0.02(NiSb)0.05[(Zr0.52Ti0.48)0.995]0.95O3 [La-PNS-PZT] ferroelectric ceramic composition has been carried out and reported here for the first time. Progressive perovskite phase formation during mechanical activation from 5 h to 40 h followed by reactive sintering was analysed from X-Ray diffraction analysis. Noticeable formation of perovskite phase after 10 h of milling and further its completion in successive reactive sintering was observed. Particle morphology of the 10 h activated nano-La-PNS-PZT powder analysed by high resolution transmission electron microscope indicated average particle size (d50) of about 24 nm. Microstructural studies of samples reactively sintered at 1220°C were performed by field emission scanning electron microscopy for powders activated for various durations, indicated the compact microstructure for 10 h activation which resulted in optimum piezoelectric properties viz. piezoelectric charge coefficient (d33 = 449 × 10-12 C/N), piezoelectric voltage coefficient (g33= 32 × 10-3 m-V/N), Figure of merit for power harvesting (14.4 × 10-12 V-m-C/N2) accompanied by excellent stability of permittivity in the range -50°C to 100°C. The output voltage obtained from simulated random vibrations of aerospace vehicles at various power spectrum density values, measures about 3.0 mV output across resistance of 1 kΩ indicating suitability of composition for harvesting the power from aerospace vehicle vibrations . [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
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