Higher permittivity of Ni-doped lead zirconate titanate, Pb [(Zr0.52Ti0.48)((1-x))Ni-x]O-3, ceramics


The paper reports highest obtained dielectric constant for Ni-doped Lead Zirconate Titanate [PZT, Pb (Zr0.52Ti0.48)O-3] 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 (epsilon') & tan delta 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 (epsilon(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.




Materials Science


Kumari, N; Monga, S; Arif, M; Sharma, N; Singh, A; Gupta, V; Vilarinho, PM; Sreenivas, K; Katiyar, RS

nossos autores


The authors are thankful to the Department of Science and Technology, (DST), Ministry of Science and Technology, Govt. of India for financial support. One of the authors (A.S.) would like to thank the DST, Ministry of Science and Technology, Govt. of India for award of Young Scientist, and BOYSCAST Fellowship. And also thankful to Professor R.S. Katiyar, UPR, DOE and NASA (USA) for lab facility made available at SPECLAB, University of Puerto Rico, USA during BOYSCAST fellowship.

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