Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)

In this work, the effects of GeO 2 dopant on the electrical properties of BaFe 0.5Nb 0.5O 3 (BFN) perovskite ceramics were investigated. The BFN powder was prepared by a conventional mixed-oxide metho...

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Main Authors: Kantha P., Pisitpipathsin N., Pengpat K., Rujijanagul G., Guo R., Bhalla A.S.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-84855784982&partnerID=40&md5=0e29e18bec16eae6d345eb45095e987c
http://cmuir.cmu.ac.th/handle/6653943832/6419
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spelling th-cmuir.6653943832-64192014-08-30T03:24:11Z Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%) Kantha P. Pisitpipathsin N. Pengpat K. Rujijanagul G. Guo R. Bhalla A.S. In this work, the effects of GeO 2 dopant on the electrical properties of BaFe 0.5Nb 0.5O 3 (BFN) perovskite ceramics were investigated. The BFN powder was prepared by a conventional mixed-oxide method using stoichiometric amounts of BaCO 3, Fe 2O 3 and Nb 2O 5. Afterward the GeO 2 contents, ranging from 1 to 5 wt.% were added to the calcined BFN powder and mixed via vibro-milling method. The mixtures were pressed and sintered at 1125-1150°C for 4 h to form dense ceramics. We showed that the addition of GeO 2 caused a reduction of grain size and formation of secondary phases: Ba 3Fe 2Ge 4O 14 and BaGeO 3. The maximum densities of these BFN doped with GeO 2 ceramics were slightly lower than those of the pure BFN due to the occurrence of pores. We also found that the GeO 2 doping could improve the dielectric properties of these ceramics at room temperature (25°C). The 1 wt.% GeO 2 doped sample exhibited higher dielectric constant of about 1800 and lower dielectric loss of 0.45 comparing to that of pure BFN. However, the dielectric constant values of these ceramics at high temperature (>25°C) were decreased significantly with the increase of GeO 2 concentration. In addition, the GeO 2 additive gave a weak ferroelectric behavior, leading to change in the pyroelectric coefficient and spontaneous polarization of the GeO 2 doped BFN ceramics. Copyright © Taylor & Francis Group, LLC. 2014-08-30T03:24:11Z 2014-08-30T03:24:11Z 2011 Article 150193 10.1080/00150193.2011.634740 FEROA http://www.scopus.com/inward/record.url?eid=2-s2.0-84855784982&partnerID=40&md5=0e29e18bec16eae6d345eb45095e987c http://cmuir.cmu.ac.th/handle/6653943832/6419 English
institution Chiang Mai University
building Chiang Mai University Library
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description In this work, the effects of GeO 2 dopant on the electrical properties of BaFe 0.5Nb 0.5O 3 (BFN) perovskite ceramics were investigated. The BFN powder was prepared by a conventional mixed-oxide method using stoichiometric amounts of BaCO 3, Fe 2O 3 and Nb 2O 5. Afterward the GeO 2 contents, ranging from 1 to 5 wt.% were added to the calcined BFN powder and mixed via vibro-milling method. The mixtures were pressed and sintered at 1125-1150°C for 4 h to form dense ceramics. We showed that the addition of GeO 2 caused a reduction of grain size and formation of secondary phases: Ba 3Fe 2Ge 4O 14 and BaGeO 3. The maximum densities of these BFN doped with GeO 2 ceramics were slightly lower than those of the pure BFN due to the occurrence of pores. We also found that the GeO 2 doping could improve the dielectric properties of these ceramics at room temperature (25°C). The 1 wt.% GeO 2 doped sample exhibited higher dielectric constant of about 1800 and lower dielectric loss of 0.45 comparing to that of pure BFN. However, the dielectric constant values of these ceramics at high temperature (>25°C) were decreased significantly with the increase of GeO 2 concentration. In addition, the GeO 2 additive gave a weak ferroelectric behavior, leading to change in the pyroelectric coefficient and spontaneous polarization of the GeO 2 doped BFN ceramics. Copyright © Taylor & Francis Group, LLC.
format Article
author Kantha P.
Pisitpipathsin N.
Pengpat K.
Rujijanagul G.
Guo R.
Bhalla A.S.
spellingShingle Kantha P.
Pisitpipathsin N.
Pengpat K.
Rujijanagul G.
Guo R.
Bhalla A.S.
Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)
author_facet Kantha P.
Pisitpipathsin N.
Pengpat K.
Rujijanagul G.
Guo R.
Bhalla A.S.
author_sort Kantha P.
title Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)
title_short Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)
title_full Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)
title_fullStr Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)
title_full_unstemmed Microstructure and electrical properties of BaFe 0.5Nb 0.5O 3 Doped with GeO 2 (1-5 wt.%)
title_sort microstructure and electrical properties of bafe 0.5nb 0.5o 3 doped with geo 2 (1-5 wt.%)
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-84855784982&partnerID=40&md5=0e29e18bec16eae6d345eb45095e987c
http://cmuir.cmu.ac.th/handle/6653943832/6419
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