Modified Solution Combustion Approach for Probing of Structural and Dielectric Properties of Sm3+ Doped  GdAlO3 Nanoparticles

S. Pratibha; R Lokesh; N. Dhananjaya; K. H. Sudheer Kumar; S.R. Manohar

Modified Solution Combustion Approach for Probing of Structural and Dielectric Properties of Sm3+ Doped GdAlO3 Nanoparticles

S. Pratibha, R Lokesh, N. Dhananjaya, K. H. Sudheer Kumar, S.R. Manohar

Abstract

A modified solution combustion approach was used in the preparation of nanosized Gd1xSmxAlO3 (x=1, 3, 5, 7, 9 mol%) using mixture of ODH and novel fuel E. tirucalli plant latex as fuels with corresponding metal nitrates. The structural morphology of synthesized and calcined powders are revealed using various analytical techniques such as Powder X-ray diffraction (PXRD), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and UV-Visible spectroscopy. XRD results show that mixture of fuels ratio is influential on the crystallite size of the resultant powders. The FTIR spectra show the lower frequency bands at 668 and 468 cm-1 corresponding to metal-oxygen bonds (possible Gd–O and Al–O stretching frequencies) vibrations for the perovskite structure compound. Effect of dopant on dielectric properties of GdAlO3 nanoparticles has been studied in the frequency range from 10 Hz to 8 MHz at room temperature using LCR meter. Results show that the incorporation of dopant leads to increase in dielectric constant. The parameters (real and imaginary part of relative permittivity and loss tangent) of synthesized nanoparticles decrease with frequency. The complex impedance spectrum analysis along with grain; and grain boundary contributions were explained using Cole-Cole plot.

Keywords

Dielectric properties, nanoparticles, TEM

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References

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