Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites

In this study, Bi and Sr doped PrCo0.6Fe0.4O3 perovskites were synthesised by citrate sol-gel auto-combustion method and sintered at 900 °C. The X-ray diffraction pattern shows that all compounds have orthorhombic crystal structure with Pbnm space group and a small amount of secondary phase was obse...

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Main Authors: Unikoth Megha, George Varghese, Karakat Shijina
Format: Article
Language:English
Published: University of Novi Sad 2017-03-01
Series:Processing and Application of Ceramics
Subjects:
Online Access:http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2035%2008.pdf
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spelling doaj-a87c5a54097846aba7c1427f3b467e402020-11-24T20:59:46ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342017-03-01111525910.2298/PAC1701052MRoom temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskitesUnikoth Megha0George Varghese1Karakat Shijina2Department of Physics, University of Calicut, Kerala-673635, IndiaResearch Centre, Mar Ivanios College, Thriuvananthapuram, 695015, Kerala, IndiaDepartment of Physics, University of Calicut, Kerala-673635, IndiaIn this study, Bi and Sr doped PrCo0.6Fe0.4O3 perovskites were synthesised by citrate sol-gel auto-combustion method and sintered at 900 °C. The X-ray diffraction pattern shows that all compounds have orthorhombic crystal structure with Pbnm space group and a small amount of secondary phase was observed only in the sample with higher Bi content (Pr0.8Bi0.2Co0.6Fe0.4O3). The average grain sizes of the samples were below 400 nm and the corresponding elemental composition was confirmed from EDS spectra. The oxidation states of elements and the presence of oxygen vacancies were obtained from XPS spectra. The vacancies were found to be more in the Sr-doped compound. Finally, from the detailed complex impedance analysis, it was found that the grain boundary resistance is dominant at room temperature. The variation of dielectric properties and AC conductivity with frequency reveals that the relaxation process was due to Maxwell-Wagner type of interfacial polarisation.http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2035%2008.pdfPrCo0.6Fe0.4O3dopingstructural characterizationelectrical propertiesgrain boundary effects
collection DOAJ
language English
format Article
sources DOAJ
author Unikoth Megha
George Varghese
Karakat Shijina
spellingShingle Unikoth Megha
George Varghese
Karakat Shijina
Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites
Processing and Application of Ceramics
PrCo0.6Fe0.4O3
doping
structural characterization
electrical properties
grain boundary effects
author_facet Unikoth Megha
George Varghese
Karakat Shijina
author_sort Unikoth Megha
title Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites
title_short Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites
title_full Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites
title_fullStr Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites
title_full_unstemmed Room temperature AC impedance and dielectric studies of Bi and Sr doped PrCo0.6Fe0.4O3 perovskites
title_sort room temperature ac impedance and dielectric studies of bi and sr doped prco0.6fe0.4o3 perovskites
publisher University of Novi Sad
series Processing and Application of Ceramics
issn 1820-6131
2406-1034
publishDate 2017-03-01
description In this study, Bi and Sr doped PrCo0.6Fe0.4O3 perovskites were synthesised by citrate sol-gel auto-combustion method and sintered at 900 °C. The X-ray diffraction pattern shows that all compounds have orthorhombic crystal structure with Pbnm space group and a small amount of secondary phase was observed only in the sample with higher Bi content (Pr0.8Bi0.2Co0.6Fe0.4O3). The average grain sizes of the samples were below 400 nm and the corresponding elemental composition was confirmed from EDS spectra. The oxidation states of elements and the presence of oxygen vacancies were obtained from XPS spectra. The vacancies were found to be more in the Sr-doped compound. Finally, from the detailed complex impedance analysis, it was found that the grain boundary resistance is dominant at room temperature. The variation of dielectric properties and AC conductivity with frequency reveals that the relaxation process was due to Maxwell-Wagner type of interfacial polarisation.
topic PrCo0.6Fe0.4O3
doping
structural characterization
electrical properties
grain boundary effects
url http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2035%2008.pdf
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