Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics
Admixture of Ba(Fe0.5Nb0.5)O3 (BFN) ceramics with different content of MnO2 (0, 0.5, 1.0, 1.5 and 2.0 wt.%) powder were processed through conventional solid-state reaction route. The XRD characterization of all sintered samples confirmed the formation of a single cubic perovskite structure.MnO2 acts...
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University of Novi Sad
2024-09-01
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| Series: | Processing and Application of Ceramics |
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| Online Access: | https://doiserbia.nb.rs/img/doi/1820-6131/2024/1820-61312403323K.pdf |
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| author | Kar Kumar Subrat Chandrasekhar Mallam Rao Lakshmana Tangi Harshavardhan Vanga Kumar Pawan |
| author_facet | Kar Kumar Subrat Chandrasekhar Mallam Rao Lakshmana Tangi Harshavardhan Vanga Kumar Pawan |
| author_sort | Kar Kumar Subrat |
| collection | DOAJ |
| description | Admixture of Ba(Fe0.5Nb0.5)O3 (BFN) ceramics with different content of MnO2 (0, 0.5, 1.0, 1.5 and 2.0 wt.%) powder were processed through conventional solid-state reaction route. The XRD characterization of all sintered samples confirmed the formation of a single cubic perovskite structure.MnO2 acts as sintering aid, which significantly enhances grain size of the BFN ceramics. The room temperature dielectric constant and conductivity of the MnO2 modified BFN ceramics were suppressed compared to the pure BFN ceramics. However, the dielectric constant increases with the increase in temperature above 250 °C. The relaxation activation energy (>0.6 eV) and high dielectric constant (≥104 at temperature above 250 °C) of the MnO2 modified BFN ceramics were explained on the basis of ionization of oxygen vacancies, mobile oxygen vacancies and polaron hopping between multiple oxidation states of manganese (Mn2+ and Mn3+). A narrow band gap of 1.45 eV was observed in the 1.5 wt.% MnO2 modified BFN ceramics. |
| format | Article |
| id | doaj-art-c0d7d7e8df144125a406d36dcd39de41 |
| institution | OA Journals |
| issn | 1820-6131 2406-1034 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | University of Novi Sad |
| record_format | Article |
| series | Processing and Application of Ceramics |
| spelling | doaj-art-c0d7d7e8df144125a406d36dcd39de412025-08-20T01:48:04ZengUniversity of Novi SadProcessing and Application of Ceramics1820-61312406-10342024-09-0118332332910.2298/PAC2403323KEffect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramicsKar Kumar Subrat0https://orcid.org/0000-0001-8034-8418Chandrasekhar Mallam1https://orcid.org/0000-0003-3029-4532Rao Lakshmana Tangi2https://orcid.org/0000-0003-1831-1934Harshavardhan Vanga3https://orcid.org/0009-0004-4348-9579Kumar Pawan4https://orcid.org/0000-0002-2737-0656UN Autonomous College of Science and Technology, Cuttck, Odisha, India + Department of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha, IndiaDepartment of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha, India + Department of Physics, CVR College of Engineering, Hyderabad, Telangana, IndiaDepartment of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha, India + Department of Physics, Vignan’s Institute of information Technology, Visakhapatnam, Andhra Pradesh, IndiaDepartment of Physics, CMR Technical Campus, Hyderabad, Telangana, IndiaDepartment of Physics and Astronomy, National Institute of Technology, Rourkela, Odisha, IndiaAdmixture of Ba(Fe0.5Nb0.5)O3 (BFN) ceramics with different content of MnO2 (0, 0.5, 1.0, 1.5 and 2.0 wt.%) powder were processed through conventional solid-state reaction route. The XRD characterization of all sintered samples confirmed the formation of a single cubic perovskite structure.MnO2 acts as sintering aid, which significantly enhances grain size of the BFN ceramics. The room temperature dielectric constant and conductivity of the MnO2 modified BFN ceramics were suppressed compared to the pure BFN ceramics. However, the dielectric constant increases with the increase in temperature above 250 °C. The relaxation activation energy (>0.6 eV) and high dielectric constant (≥104 at temperature above 250 °C) of the MnO2 modified BFN ceramics were explained on the basis of ionization of oxygen vacancies, mobile oxygen vacancies and polaron hopping between multiple oxidation states of manganese (Mn2+ and Mn3+). A narrow band gap of 1.45 eV was observed in the 1.5 wt.% MnO2 modified BFN ceramics.https://doiserbia.nb.rs/img/doi/1820-6131/2024/1820-61312403323K.pdfba(fe0.5nb0.5)o3mn-dopingelectric and dielectric propertiesoptical bandgap |
| spellingShingle | Kar Kumar Subrat Chandrasekhar Mallam Rao Lakshmana Tangi Harshavardhan Vanga Kumar Pawan Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics Processing and Application of Ceramics ba(fe0.5nb0.5)o3 mn-doping electric and dielectric properties optical bandgap |
| title | Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics |
| title_full | Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics |
| title_fullStr | Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics |
| title_full_unstemmed | Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics |
| title_short | Effect of MnO2 addition on structure, electrical and optical properties of Ba(Fe0.5Nb0.5)O3 ceramics |
| title_sort | effect of mno2 addition on structure electrical and optical properties of ba fe0 5nb0 5 o3 ceramics |
| topic | ba(fe0.5nb0.5)o3 mn-doping electric and dielectric properties optical bandgap |
| url | https://doiserbia.nb.rs/img/doi/1820-6131/2024/1820-61312403323K.pdf |
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