Voigt Fitting is of Special Interest for Impedance and Raman Spectroscopic Analysis for Two-Layered Aurivillius Compound

Md. Abdul Basheer¹ , G. Prasad² , ³ , N.V. Prasad⁴

1. Material Research Laboratory, Department of Physics, Osmania University, Hyderabad 500007, India.
2. Material Research Laboratory, Department of Physics, Osmania University, Hyderabad 500007, India.
3. Material Research Laboratory, Department of Physics, Osmania University, Hyderabad 500007, India.

Section:Research Paper, Product Type: Journal-Paper
Vol.8 , Issue.2 , pp.1-5, Apr-2020

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v8i2.15

Online published on Apr 30, 2020

Copyright © Md. Abdul Basheer, G. Prasad, , N.V. Prasad . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Bi₃TiNbO₉ compound is a good ferroelectric with high Curie temperature among other bismuth layered structure ferroelectric (BLSF) of Aurivillius family. To explore the plausible fundamental information about dielectric relaxation, observed in the radio frequency region, a criterion, based on the spectroscopic peak value along with its full width at half maximum, is necessary. In view of this, Voigt profile is fitted to the unsymmetrical bell shaped impedance spectroscopic data of our earlier work made on samarium modified Bi₃TiNbO₉ ceramics. In the present investigation, systematic studies like Lorentzian and Gaussian fitting were also made. Voigt profile (Vf and Vʹf) and its parameters are found to be useful to understand the dielectric relaxation mechanism. The results were corroborated to the Raman spectroscopic plots. Such systematic studies are hitherto not reported.

Key-Words / Index Term :
BLSF, Impedance, Raman spectroscopy, relaxation, Gaussian, Lorentzian, Voigt fitting.

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