Anantharaman, M R; Muhammad, Abdul Jamal E; Sakthi Kumar, D(Springer, December 22, 2008)
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Abstract:
Zinc aluminate nanoparticles with average particle size of 40 nm were synthesized using a sol–gel combustion
method. X-ray diffractometry result was analysed by Rietveld refinement method to establish the phase
purity of the material. Different stages of phase formation of the material during the synthesis were investigated
using differential scanning calorimetry and differential thermogravimetric analysis. Particle size was determined
with transmission electron microscopy and the optical bandgap of the nanoparticles was determined by absorption
spectroscopy in the ultraviolet-visible range. Dielectric permittivity and a.c. conductivity of the material were
measured for frequencies from 100 kHz to 8 MHz in the temperature range of 30–120◦C. The presence of Maxwell–
Wagner type interfacial polarization was found to exist in the material and hopping of electron by means of quantum
mechanical tunneling is attributed as the reason for the observed a.c. conductivity
Description:
Bull. Mater. Sci., Vol. 34, No. 2, April 2011, pp. 251–259