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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University of Novi Sad
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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 |
work_keys_str_mv |
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1716781607037173760 |