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Title: Synthesis, characterization and dielectric studies of cerium phospho iodate and cadmium doped cerium phospho iodate in nano form
Authors: Indulal, C R
Raveendran, R
Keywords: Nano particles
Dielectric permittivity
Issue Date: Feb-2010
Publisher: CSIR
Abstract: Nano particles of cerium phospho iodate (CPI) and cadmium doped cerium phospho iodate (Cd doped CPI) have been prepared by chemical co-precipitation method. The particle size and crystal structure of CPI and Cd doped CPI nano powder are characterized by X-ray diffraction (XRD). The surface morphology of the samples is studied from SEM images. The FTIR spectrum is used to study the stretching and bending frequencies of molecular groups in the sample. Temperature and frequency dependence of the dielectric constant and ac electrical conductivity are studied for 0.02 and 0.04 molarities of the dopant. The dielectric permittivities of nano sized samples are evaluated from the observed capacitance values in the frequency range 100 Hz-1 MHz and in the temperature range 50°-100°C. It has been found that with decreasing frequency, the dielectric constant increases much more obviously for the doped sample. As the temperature increases more and more dipoles are oriented resulting in an increase in the values of molecular dipole moment. Space charge polarization and rotational polarization play a crucial role in the dielectric behaviour of the nano sized material. From the permittivity studies, ac electrical conductivity is evaluated. The dielectric and ac electrical conductivity studies of the samples are made at different molarities of the dopant.
Page(s): 121-126
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.48(02) [February 2010]

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