Comparative X-ray diffraction and Mössbauer spectroscopy studies of BiFeO3ceramics prepared by conventional solid-state reaction and mechanical activation

E. Jartych , Agata Lisinska-Czekaj , Dariusz Oleszak , D Czekaj

Abstract

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 Bi2Fe 4O9 and sillenite were recognized. In the case of mechanical activation, the milling of stoichiometric amounts of Bi 2O3 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 Fe 2O3 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 Bi 2O3, 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. © 2013 Versita Warsaw and Springer-Verlag Wien.

Author E. Jartych - [Politechnika Lubelska (PL)]
E. Jartych,,
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- Politechnika Lubelska
, Agata Lisinska-Czekaj - [University of Silesia in Katowice]
Agata Lisinska-Czekaj,,
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, Dariusz Oleszak (FMSE / DCFM)
Dariusz Oleszak,,
- Division of Construction and Functional Materials
, D Czekaj - [University of Silesia in Katowice]
D Czekaj,,
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Journal seriesMaterials Science-Poland, ISSN 2083-1331, [2083-134X, 0137-1339]
Issue year2013
Vol31
Pages211-220
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 3104 Condensed Matter Physics; 2500 General Materials Science
DOIDOI:10.2478/s13536-012-0093-1
Languageen angielski
Score (nominal)15
Score sourcejournalList
ScoreMinisterial score = 15.0, 26-05-2020, ArticleFromJournal
Ministerial score (2013-2016) = 15.0, 26-05-2020, ArticleFromJournal
Publication indicators Scopus Citations = 8; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 0.328; WoS Impact Factor: 2013 = 0.327 (2) - 2013=0.435 (5)
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