Abstract: ZnO is multifunctional semiconductor material having useful practical applications. Zno is promising in various scientific fields like energy harvesting, sensors, nanogenerators, optoelectronics, transducers and biomedical devices due to fascinating and remarkable properties. We report growth of ZnO nanoneedles by thermal oxidation of micro particles of metallic zinc in air at 480 ºC and 500 ºC. The zinc particles are deposited on the Si substrate by dip coating method. Zinc deposited substrates are oxidized by thermal radiation method in halogen tube furnace. The whole needles are wurtzite single crystal. The growth concentration and density of nanoneedles depends on the size of metallic zinc particles, oxidation time and oxidation temperature. Scanning electron microscope (SEM).

• Publication Date: 29-Dec-2015
• DOI: 10.15224/978-1-63248-084-2-44
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Abstract: In this paper, synthesis and study of structure, microstructure, dielectric, ferroelectric, and pyroelectric properties of the (1-x) PZT 82.5/17.5 – xTa2O5, where x = 0; 0.5; 1; 1.5; 2% mol is presented. From experimental results, it was showed that the fabricated ferroelectric systems are of pure perovskite phase, rhombohedral structure, good microstructure, good dielectric, ferroelectric properties and strong pyroelectric effect. All samples are good ferroelectric ceramics such as the ceramic density ρ = 7.30 - 7.51(g/cm3), the dielectric constant ε = 226 - 314, the dielectric dissipation factor tgδ = 0.008 - 0.023, hysteresis loops of rectangular forms with the permanent polarizations Pr = 23.2 - 32.4 (C/cm2), electric coercive fields Ec = 6.8-8.9 (kV/cm), strong pyroelectric effect with maxima of pyroelectric coefficients γ = 6.1 - 12.4 (10-2.μC.cm-2.K-1), and pyroelectric coefficients at room temperature: 2.19 - 5.80 (10-3.μC.cm-2.K-1)

• Publication Date: 29-Dec-2015
• DOI: 10.15224/978-1-63248-084-2-43
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