Low temperature broad band dielectric spectroscopy of multiferroic Bi6Fe2Ti3O18 ceramics

• Autorzy: Lisińska-Czekaj A. , Rerak M. , Czekaj D. , Lubina M. , Garbarz-Glos B. , Bąk W.

Identyfikatory

DOI

DOI: 10.1515/amm-2016-0237

• Języki publikacji: EN

Abstrakty

EN

In the present research the tool of broadband dielectric spectroscopy was utilized to characterize dielectric behavior of Bi6Fe2Ti3O18is (BFTO) Aurivillius-type multiferroic ceramics. Dielectric response of BFTO ceramics was studied in the frequency domain (Δν=0.1Hz - 10MHz) within the temperature range ΔΤ=-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 Ε_A=0.20eV to Ε_A=0.55eV while temperature rises from Τ=-100°C up to Τ=200°C. On the base of maxima of the impedance semicircles (ω_mτ_m=l) the relaxation phenomena were characterized in terms of the temperature dependence of relaxation times and relevant activation energy was calculated (Ε_A=0.55eV).

Słowa kluczowe

EN

low temperature; broad band dielectric spectroscopy; multiferroic Bi6Fe2Ti3O18 ceramics

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2016
• Tom: Vol. 61, iss. 3
• Strony: 1447--1452
• Opis fizyczny: Bibliogr. 19 poz., rys., wykr.

Twórcy

autor

Lisińska-Czekaj A.

autor

Rerak M.

autor

Czekaj D.

autor

Lubina M.

autor

Garbarz-Glos B.

autor

Bąk W.

Bibliografia

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Uwagi

EN

The present research was supported by University of Silesia in Katowice, Poland from the funds for science - research potential (NO 1S-0800-001-1-05-01).