Higher permittivity of Ni-doped lead zirconate titanate,Pb[(Zr0.52Ti0.48)(1-x) Nix]O3, ceramics |
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Authors: | Nitu Kumari Shagun Monga Mohd Arif Neeraj Sharma Arun Singh Vinay Gupta Paula M Vilarinho K Sreenivas RS Katiyar |
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Affiliation: | 1. Advanced Electronic and Nano-Materials Laboratory, Department of Physics, Jamia Millia Islamia (a Central University), New Delhi 110025, India;2. Department of Physics, TMB University, Bhagalpur 812007, India;3. Department of Physics & Astrophysics, University of Delhi, Delhi 110007, India;4. Department of Ceramics and Glass Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;5. SPECLAB, Department of Physics, University of Puerto Rico, San Juan 00931, PR, USA |
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Abstract: | The paper reports highest obtained dielectric constant for Ni-doped Lead Zirconate Titanate PZT, Pb(Zr0.52Ti0.48)O3] ceramics. The Ni-doped PZT ceramic pellets were prepared via conventional solid-state reaction method with Ni content chosen in the range 0–20?at%. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy were employed to investigate the crystal structure of the prepared ceramics. The X-ray diffraction analysis indicated that the ceramic pellets had crystallized into tetragonal perovskite structure. A minute displacement of XRD peaks was detected in the diffraction spectra of Ni-doped PZT ceramic samples which when examined by size-strain plot (SSP) method revealed presence of homogenous strain that decreased with increase in concentration of Ni. In FTIR the maximum absorption at 597?cm?1, 608?cm?1, 611?cm?1, 605 and 613?cm?1 for Ni?=?0, 5, 10, 15 and 20?at%, respectively, confirmed the formation of perovskite structure in all the compositions and the slight shift suggests decrease in cell size on doping. The values of dielectric constant (ε′) & tanδ as a function of frequency and temperature were measured for the prepared ceramics and it revealed highest ever reported dielectric constant for Ni - doped PZT with Ni?=?5?at%. The dielectric variation with temperature exhibited a diffused type ferroelectric–paraelectric phase transition for the doped samples. Also, the maximum dielectric constant value (ε′max) decreased while the phase transition temperature increased with increase in doping concentration of Ni. The estimated activation energy of different compositions was found to increase from 0.057 to 0.068?eV for x?=?0.00 to x?=?0.20 in ferroelectric phase. The piezoelectric, ferroelectric and magnetic properties were also investigated. |
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Keywords: | Dielectric Piezoelectric ceramics Solid-state reaction Ni-doping |
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