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Abstract
In the present research the tool of broadband dielectric spectroscopy was utilized to characterize dielectric behavior of Bi6Fe2Ti3O18 (BFTO) Aurivillius-type multiferroic ceramics. Dielectric response of BFTO ceramics was studied in the frequency domain (Δν=0.1Hz – 10MHz) within the temperature range ΔT=-100°C – 200°C. The Kramers-Kronig data validation test was employed to validate the impedance data measurements and it was found that the measured impedance data exhibited good quality justifying further analysis. The residuals were found to be less than 1%, whereas the “chi-square” parameter was within the range χ2~10-7-10-5. Experimental data were analyzed using the circle fit of simple impedance arc plotted in the complex Z”-Z’ plane (Nyquist plot). The total ac conductivity of the grain boundaries was thus revealed and the activation energy of ac conductivity for the grain boundaries was calculated. It was found that activation energy of ac conductivity of grain boundaries changes from EA=0.20eV to EA=0.55eV while temperature rises from T=-100°C up to T=200°C. On the base of maxima of the impedance semicircles (ωmτm=1) the relaxation phenomena were characterized in terms of the temperature dependence of relaxation times and relevant activation energy was calculated (EA=0.55eV).
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Authors (6)
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Michał Rerak
-
Martyna Lubina
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B Garbarz-Glos
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Wojciech Bąk dr hab.
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1515/amm-2016-0237
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
ARCHIVES OF METALLURGY AND MATERIALS
no. 61,
pages 1447 - 1452,
ISSN: 1733-3490 - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Lisińska-Czekaj A., Rerak M., Czekaj D., Lubina M., Garbarz-Glos B., Bąk W.: Low temperature broad band dielectric spectroscopy of multiferroic Bi6Fe2Ti3O18 ceramics// ARCHIVES OF METALLURGY AND MATERIALS -Vol. 61,iss. 3 (2019), s.1447-1452
- DOI:
- Digital Object Identifier (open in new tab) 10.1515/amm-2016-0237
- Verified by:
- Gdańsk University of Technology
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