NDLI: Dielectric properties of BiFeO$_{3}$ ceramics obtained from mechanochemically synthesized nanopowders

Content Provider	Springer Nature Link
Author	Markiewicz, E. Hilczer, B. Błaszyk, M. Pietraszko, A. Talik, E.
Copyright Year	2011
Abstract	Dielectric behaviour of BiFeO$_{3}$ ceramics, obtained by hot-pressing of nanopowders produced by mechanochemical synthesis from Bi$_{2}$O$_{3}$ and Fe$_{2}$O$_{3}$ oxides (weight ratio 2:1), was studied in the temperature range 125–575 K. The ceramics was found to exhibit step-like dielectric response ε*(T) with high permittivity values, similar to the behaviour of materials with giant dielectric permittivity. Three overlapping relaxation processes contribute to the dielectric response: i) relaxation in the low-temperature range (220–420 K), characterized by activation energy of 0.4 eV, ii) relaxation in the temperature range 320–520 K with activation energy of 1.0 eV and iii) broad dielectric anomaly in the vicinity of 420 K, which disappears after 1 h annealing at 775 K. The low-temperature relaxation is ascribed to the carrier hopping process between Fe$^{2+}$ and Fe$^{3+}$ ions. The presence of mixed valence of the Fe ions was proved by X-ray photoelectron spectroscopy. Dielectric relaxation in the middle-temperature range is considered as a result of grain boundary effect and internal barrier layers related to Bi$_{25}$FeO$_{40}$ phase as verified by X-ray diffraction. The high-temperature dielectric anomaly we relate to short-range hopping of ordered oxygen vacancies.
Starting Page	154
Ending Page	161
Page Count	8
File Format	PDF
ISSN	13853449
Journal	Journal of Electroceramics
Volume Number	27
Issue Number	3-4
e-ISSN	15738663
Language	English
Publisher	Springer US
Publisher Date	2011-11-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	BiFeO$_{3}$ Powders-solid state reaction Defects Dielectric properties Electrical conductivity Electrochemistry Optical and Electronic Materials Characterization and Evaluation of Materials Ceramics, Glass, Composites, Natural Methods Crystallography
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Materials Chemistry Mechanics of Materials Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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