Temperature dependence anomalous dielectric relaxation in Co doped ZnO nanoparticles Article

Ansari, SA, Nisar, A, Fatma, B et al. (2012). Temperature dependence anomalous dielectric relaxation in Co doped ZnO nanoparticles . MATERIALS RESEARCH BULLETIN, 47(12), 4161-4168. 10.1016/j.materresbull.2012.08.079

cited authors

  • Ansari, SA; Nisar, A; Fatma, B; Khan, W; Chaman, M; Azam, A; Naqvi, AH

authors

abstract

  • We have reported temperature and frequency dependence of dielectric behavior of nanocrystalline Zn 1-xCo xO (x = 0.0, 0.01, 0.05 and 0.1) samples prepared by gel-combustion method. The synthesized samples were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and LCR-meter, respectively. The XRD analysis reveals that ZnO has a hexagonal (wurtzite) crystal structure. The morphology and size of the nanoparticles (∼10-25 nm) were observed by SEM for 5% Co doped ZnO sample. In dielectric properties, complex permittivity (ε* = ε' - jε''), loss tangent (tan δ) and ac conductivity (σ ac) in the frequency range 75 kHz to 5 MHz were analyzed with temperature range 150-400°C. The experimental results indicate that ε', ε'', tan δ and σ ac decreases with increase in frequency and temperature. The transition temperature as obtained in dispersion curve of dielectric constant shifts toward higher temperature with increase Co content. © 2012 Elsevier Ltd. All rights reserved.

publication date

  • December 1, 2012

published in

Digital Object Identifier (DOI)

start page

  • 4161

end page

  • 4168

volume

  • 47

issue

  • 12