Dielectric response and electric conductivity of ceramics obtained from BiFeO3 synthesized by microwave hydrothermal method
PBN-AR
Instytucja
Instytut Fizyki Molekularnej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN
0925-8388
EISSN
Wydawca
ELSEVIER SCIENCE SA
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
493-501
Numer tomu
671
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Streszczenia
Język
en
Treść
BiFeO3 powder which formed ball-like structures resembling flowers was obtained by microwave hydrothermal synthesis. The flowers were of a dozen or so mm in diameter and the thickness of the crystallites forming petals could be controlled. The material was characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. Dielectric response of ceramics obtained from the powder contained three extrinsic contributions, which could be correlated with the differences in temperature variation of the ac conductivity. The dielectric relaxation between 150 K and 300 K was related to reorientations of Fe3+-Fe2+ dipoles and characterized by an activation energy of 0.4 eV, which was independent of the petal thickness. The dielectric and electric response in the range 300 K divided by 450 K usually ascribed to the grain boundary and interfacial polarization effect was diffused and could not be characterized. Above 450 K the activation energy of dc conductivity was 1.73 eV and 1.52 eV for ceramics consisting of crystallites of mean thickness of 160 nm and 260 nm, respectively. The energies, which are considerably higher than those reported earlier for BFO nanoceramics, were discussed considering the interactions between oxygen vacancies and size scaled ferroelectric domain walls, which in BiFeO3 are associated with electrostatic potential steps. (C) 2016 Elsevier B.V. All rights reserved.
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ORIGINAL_ARTICLE
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System-identifier
739167
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