首页|Dielectric, impedance and conductivity properties of pristine and (Gd, Ru)-dual doped NiO nanoparticles
Dielectric, impedance and conductivity properties of pristine and (Gd, Ru)-dual doped NiO nanoparticles
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NSTL
Elsevier
? 2022 Elsevier B.V.This study investigates the synthesis of Ni1–2xGdxRuxO nanoparticles, with different concentrations of Gd and Ru dual dopants, in an attempt to improve their dielectric and electrical properties. These samples are synthesized via the co-precipitation method, and characterized by various structural, methods, including the X-Ray Diffraction (XRD), Transmission Electron Microscope (TEM), and Raman spectroscopy. The XRD patterns demonstrated the formation of single NiO phase, revealing the good incorporation of (Gd, Ru) in NiO lattice. The crystallite size decreased from 21 to 10 nm with increasing the dual dopants’ concentration. The TEM images demonstrated pseudo-spherical morphology of the Ni1–2xGdxRuxO nanoparticles and the Raman spectra detected the fundamental vibrational modes of NiO. The frequency and temperature-dependent dielectric constants were augmented by the incorporation of the dual dopants, due to the induced nickel vacancies and larger surface-to-volume ratio. The Nyquist plots demonstrated depressed semicircles with smaller radii as the temperature and the dual dopants’ concentration increased. This was related to the enhancement of ac conductivity that followed different trends at room and high temperatures. The ac conductivity was tuned by varying the dual dopants concentration due to the ionic compensation mechanism, and the changes in the charge carriers’ concentrations and mobility. The correlation between the different dielectric and electric parameters suggested the dominance of the long-range conduction of the charge carriers.
Chemical synthesisDielectric propertiesNanostructuresRaman spectroscopy
Abdallah A.M.、Awad R.、Noun M.
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Department of Physics Faculty of Science Beirut Arab University
Lebanese Atomic Energy Commission National Council for Scientific Research
NSTL
Elsevier
