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Comparative X-ray diffraction and Mössbauer spectroscopy studies of BiFeO3 ceramics prepared by conventional solid-state reaction and mechanical activation

Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The aim of this work was to prepare BiFeO3 by modified solid-state sintering and mechanical activation processes and to investigate the structure and hyperfine interactions of the material. X-ray diffraction and Mössbauer spectroscopy were applied as complementary methods. In the case of sintering, BiFeO3 phase was obtained from the mixture of precursors with 3 and 5 % excess of Bi2O3 during heating at 1023 K. Small amounts of impurities such as Bi2Fe4O9 and sillenite were recognized. In the case of mechanical activation, the milling of stoichiometric amounts of Bi2O3 and Fe2O3 followed by isothermal annealing at 973 K resulted in formation of the mixture of BiFeO3, Bi2Fe4O9, sillenite and hematite. After separate milling of individual Bi2O3 and Fe2O3 powders, mixing, further milling and thermal processing, the amount of desired BiFeO3 pure phase was significantly increased (from 70 to 90 %, as roughly estimated). From Mössbauer spectra, the hyperfine interaction parameters of the desired BiFeO3 compound, paramagnetic impurities of Bi2Fe4O9 and sillenite were determined. The main conclusion is that the lowest amount of impurities was obtained for BiFeO3 with 3 % excess of Bi2O3, which was sintered at 1023 K. However, in the case of mechanical activation, the pure phase formed at a temperature by 50 K lower as compared to solid-state sintering temperature. X-ray diffraction and Mössbauer spectroscopy revealed that for both sintered and mechanically activated BiFeO3 compounds, thermal treatment at elevated temperature led to a partial eliminating of the paramagnetic impurities.
Wydawca
Rocznik
Strony
211--220
Opis fizyczny
Bibliogr. 28 poz., tab., wykr.
Twórcy
autor
  • Institute of Electronics and Information Technology, Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Nadbystrzycka str. 38A, PL-20-618 Lublin, Poland
  • Department of Materials Science, University of Silesia, ´ Snie˙zna str. 2, PL-41-200 Sosnowiec, Poland
autor
  • Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska str. 141, PL-02-507 Warsaw, Poland
autor
  • Department of Materials Science, University of Silesia, Śnieżna str. 2, PL-41-200 Sosnowiec, Poland
Bibliografia
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  • [16] ICSD collection codes: 15299, 20288, 20372, 20618,22342, 28027, 28622, 75324, 51664, 97591, 109370,154394.
  • [17] JCPDS card number 25-0090.
  • [18] ICSD collection codes: 68627, 62719.
  • [19] ICDD code: 01-070-5668.
  • [20] WILLIAMSON G.K., HALL W.H., Acta Metallurg., 1 (1953), 22.
  • [21] ICDD code: 20-0836.
  • [22] THOSAR B.V., SRIVASTAVA J.K., IYENGAR P.K., BHARGAVA S.C., Advances in Mössbauer Spectroscopy. Applications to Physics, Chemistry and Biology, Elsevier Scientific Publishing Company, Amsterdam–Oxford–New York, 1983.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-556988ac-b300-4708-b2d0-ed6bcb98df97
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