Dielectric properties of BiFeO3 ceramics obtained from mechanochemically synthesized nanopowders
作者： E. Markiewicz , B. Hilczer , M. Błaszyk , A. Pietraszko , E. Talik
DOI: 10.1007/S10832-011-9660-9
关键词: Grain boundary 、 Analytical chemistry 、 Materials science 、 Annealing (metallurgy) 、 Activation energy 、 Dielectric 、 Electrical resistivity and conductivity 、 Permittivity 、 Nuclear magnetic resonance 、 X-ray photoelectron spectroscopy 、 Atmospheric temperature range
摘要: Dielectric behaviour of BiFeO3 ceramics, obtained by hot-pressing nanopowders produced mechanochemical synthesis from Bi2O3 and Fe2O3 oxides (weight ratio 2:1), was studied in the temperature range 125–575 K. The ceramics found to exhibit step-like dielectric response e*(T) with high permittivity values, similar materials giant permittivity. Three overlapping relaxation processes contribute response: i) low-temperature (220–420 K), characterized activation energy 0.4 eV, ii) 320–520 K 1.0 eV iii) broad anomaly vicinity 420 K, which disappears after 1 h annealing at 775 K. is ascribed carrier hopping process between Fe2+ Fe3+ ions. presence mixed valence Fe ions proved X-ray photoelectron spectroscopy. middle-temperature considered as a result grain boundary effect internal barrier layers related Bi25FeO40 phase verified diffraction. high-temperature we relate short-range ordered oxygen vacancies.
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