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Mössbauer Spectroscopy, X-Ray Diffraction and SEM Studies on Multiferroic Bi_5Ti_3FeO_{15} Ceramics

100%
Rymarczyk J., Hanc A., Dercz G., Ilczuk J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1579-1584
EN
Magnetoelectric multiferroics are materials which exhibit both magnetic order and ferroelectricity in the same phase. Multiferroic materials, where ferroelectricity and magnetism coexist, were extensively studied. This class of materials offers a large application potential for new devices due to the two coupled degrees of freedom based on the local off-centered distortion and the electron spin. The studied Bi_5Ti_3FeO_{15} ceramics was prepared by conventional synthesis and hot uniaxial pressing reaction applying the conventional mixture of TiO_2, Fe_2O_3 and Bi_2O_3 oxides as precursor materials. The present work focuses on the structure analysis of multiferroic Bi_5Ti_3FeO_{15} ceramics performed by X-ray diffraction method, scanning electron microscopy and the Mössbauer spectroscopy methods.
2
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Processing, Microstructure and Dielectric Properties of the Bi_5Ti_3FeO_{15} Ceramic

100%
Rymarczyk J., Dercz G., Ilczuk J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-191-A-197
EN
The aim of the present work is the analysis of microstructure, dielectric permittivity and thermal properties analysis of Bi_5Ti_3FeO_{15} ceramics obtained by two methods. The studied Bi_5Ti_3FeO_{15} ceramics were prepared by conventional synthesis and hot uniaxial pressing reaction from the conventional mixture of oxides, viz. TiO_2, Fe_2O_3, Bi_2O_3. The studied material has layered perovskite like structures, first described by Aurivillius in 1949 and Subbaro in 1969. The ceramic Bi_5Ti_3FeO_{15} is known to contain a series of compounds with the general formula: Bi_{m+1}Fe_{m-3}Ti_3O_{3m+3}. The X-ray diffraction methods were used for qualitative phase analysis of studied samples. The morphology was analyzed by scanning electron microscopy method. The thermal properties of the studied materials were measured using the differential thermal analysis at a constant heating rate of 15 K/min under an argon protective atmosphere. Thermal dependence of dielectric permittivity was studied between room temperature and 1137 K.
3
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Modelling of electric current flow in 1D Pd-C nanostructure: comparison with experiment

88%
Bielski W., Kowalczyk P., Czerwosz E., Idzik A., Rymarczyk J.
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2014
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issue 3
4
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Structural Studies with the Use of XRD and Mössbauer Spectroscopy οf Bi_5Ti_3FeO_{15} Ceramic Powders Obtained by Mechanical Synthesis

76%
Dercz G., Rymarczyk J., Hanc A., Prusik K., Babilas R., Pająk L., Ilczuk J.
Acta Physica Polonica A
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2008
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vol. 114
|
issue 6
1623-1629
EN
In this paper the structural and Mössbauer spectral properties of multiferroic ceramic Bi_5Ti_3FeO_{15} powders prepared by high-energy ball milling of polycrystalline precursor material (mixture of Bi_2O_3, TiO_2 and Fe_2O_3 powders) are presented. Mechanical synthesis was performed by high-energy vibratory mill. The X-ray diffraction methods were applied for the structure characterization of the studied samples. The parameters of diffraction line profiles were determined by PRO-FIT Toraya procedure. The crystallite sizes and lattice distortions were analyzed using the Williamson-Hall method. Investigations of hyperfine interactions in the studied materials were carried out by the Mössbauer spectroscopy. The powder morphology was analyzed by scanning electron microscopy and transmission electron microscopy techniques. It was found that during high-energy milling phase transitions, a decrease in crystallite size and amorphization process are observed.
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