Low temperature broad band dielectric spectroscopy of multiferroic Bi6Fe2Ti3O18 ceramics - Publikacja - MOST Wiedzy

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Low temperature broad band dielectric spectroscopy of multiferroic Bi6Fe2Ti3O18 ceramics

Abstrakt

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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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
ARCHIVES OF METALLURGY AND MATERIALS nr 61, strony 1447 - 1452,
ISSN: 1733-3490
Język:
angielski
Rok wydania:
2019
Opis bibliograficzny:
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:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1515/amm-2016-0237
Weryfikacja:
Politechnika Gdańska

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