A Study on the Temperature Dependence of Particle Size and Dielectric Properties of Cerium Molybdotungstate Nano Particles

DOI : http://dx.doi.org/10.13005/msri/060235

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The structural properties of Cerium molybdotungstate (CMT) nano-particles annealed at different temperatures (100?C to 400?C, including room temperature) have been characterized by X-ray diffraction (XRD) method. The variations in the particle size have been studied by annealing the samples at 2hrs and 4hrs for different temperatures. The XRD patterns shows Cerium Molybdo Tungstate nano particles contains monoclinic phases and the grain size of crystals increases on increasing the annealing temperatures. The morphology of the samples is studied using SEM and TEM images. The FTIR spectrum has been used to study about the stretching and bending frequencies of the sample. The dielectric permittivity of nano sized sample is evaluated from the observed capacitance values in the frequency range 100Hz to 1MHz and in the temperature range of 50o to110oC. It is seen that with decreasing frequency, the dielectric constant increases much more obviously than that of the conventional materials. The value of dielectric constant found to increase with increase in temperature.

Nanoparticle; dielectric permittivity; annealing temperature; TEM