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1
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Mössbauer Spectroscopy Studies of Multiferroic (BiFeO_3)_{1 - x}-(BaTiO_3)_{x} Solid Solutions Prepared by Mechanical Activation

100%
Jartych E., Malesa B., Antolak-Dudka A., Oleszak D.
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vol. 125
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issue 3
837-839
EN
X-ray diffraction and ^{57}Fe Mössbauer spectroscopy were applied as complementary methods in order to investigate the structure and hyperfine interactions of (BiFeO_3)_{1-x}-(BaTiO_3)_{x} solid solutions prepared by mechanical activation and subsequent heat treatment.
2
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Process of Amorphization Induced by Mechanical Alloying of Iron with Tungsten and Niobium

100%
Jartych E., Oleszak D., Żurawicz J.
Acta Physica Polonica A
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2001
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vol. 100
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issue 5
731-736
EN
Mechanical alloying method was used to synthesise powders of iron with tungsten and niobium. Mössbauer spectroscopy and X-ray diffraction have been applied to monitor the progress in solid-state reactions. In the case of Fe-W system, exhibiting a positive heat of mixing, no trace of amorphization was observed for 20 and 33 at.% of W, as the calculations of phase diagram (CALPHAD) method suggest. During the mechanical alloying process, two solid solutions Fe(W) and W(Fe) were obtained. Mössbauer measurements allowed to recognise the Fe(W) solid solution as a ferromagnetic phase, while the W(Fe) solid solution as a paramagnetic one. In the case of Fe-Nb system, exhibiting a negative heat of mixing, single phase amorphous alloys were synthesised during mechanical alloying of iron with 48 and 64 at.% of Nb. For both investigated compositions, the final products of mechanical alloying processes were amorphous paramagnetic alloys.
3
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Structure and Hyperfine Interactions of Mechanically Activated Delafossite CuFeO₂

100%
Siedliska K., Pikula T., Oleszak D., Jartych E.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
372-375
EN
Delafossite CuFeO₂ belongs to multiferroic class of materials. In this work, copper ferrite was prepared by mechanical activation with subsequent thermal treatment. X-ray diffraction and Mössbauer spectroscopy were used as complementary methods to study the structure and hyperfine interactions of the material. As proved by X-ray diffraction, CuFeO₂ compound was obtained with relatively low amount of secondary phases like CuO and CuFe₂O₄. The Mössbauer spectroscopy revealed paramagnetic character of the compound at room temperature. The purest delafossite CuFeO₂ was obtained by mechanical activation of pre-milled precursors and sintering at 1173 K. The temperature of thermal treatment is lower by 100 K as compared to the traditional solid-state synthesis.
4
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Structure and Magnetic Properties of Nanocrystalline Fe-Mo Alloys Prepared by Mechanosynthesis

100%
Karolus M., Jartych E., Oleszak D.
Acta Physica Polonica A
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2002
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vol. 102
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issue 2
253-258
EN
Nanocrystalline samples of Fe_{80}Mo_{20} and Fe_{50}Mo_{50} alloys were prepared by the mechanical milling method. The structure, lattice parameters, and crystallite size were determined by the X-ray diffraction. The magnetic properties of the milled products were determined by the M"ossbauer spectroscopy. It was observed that in the case of the Fe_{80}Mo_{20} alloy a solid solution of Mo in Fe was formed with the lattice parameters of Fe increasing from 0.28659 nm to 0.29240 nm and the crystallite size decreasing from 250 nm to 20 nm. In the case of the Fe_{50}Mo_{50} alloy there were no clear changes in values of the lattice parameters of Fe and Mo during the milling process, but the crystallite size decreased from 200 nm to 15 nm. Mössbauer spectra revealed different magnetic phases in the mechanosynthesized Fe-Mo samples. In the case of the Fe_{80}Mo_{20} alloy, the spectrum for the milled mixture indicated the formation of a solid solution. In contrast, for the Fe_{50}Mo_{50} the spectrum indicated the disappearance of the ferromagnetic phase.
5
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Structure and Mössbauer Spectroscopy Studies of Multiferroic Mechanically Activated Aurivillius Compounds

88%
Mazurek M., Oleszak D., Pikula T., Karolus M., Jartych E.
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vol. 126
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issue 4
975-978
EN
X-ray diffraction and ^{57}Fe Mössbauer spectroscopy were applied as complementary methods to investigate the structure and hyperfine interactions of the Aurivillius compounds prepared by mechanical activation and subsequent heat treatment. Preliminary milling of precursors enhanced the diffusion process and pure Aurivillius compounds were obtained at lower temperature as compared with conventional solid-state sintering technology (lower at least by 50 K). All the investigated Aurivillius compounds are paramagnetic materials at room temperature.
6
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Structure and Hyperfine Interactions in Aurivillius Bi_{9}Ti_{3}Fe_{5}O_{27} Conventionally Sintered Compound

88%
Mazurek M., Lisińska-Czekaj A., Surowiec Z., Jartych E., Czekaj D.
Acta Physica Polonica A
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2011
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vol. 119
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issue 1
72-74
EN
The structure and hyperfine interactions in the Bi_{9}Ti_{3}Fe_{5}O_{27} Aurivillius compound were studied using X-ray diffraction and Mössbauer spectroscopy. Samples were prepared by the conventional solid-state sintering method at various temperatures. An X-ray diffraction analysis proved that the sintered compounds formed single phases at temperature above 993 K. Mössbauer measurements have been carried out at room and liquid nitrogen temperatures. Room-temperature Mössbauer spectrum of the Bi_{9}Ti_{3}Fe_{5}O_{27} compound confirmed its paramagnetic properties. However, low temperature measurements revealed the additional paramagnetic phase besides the antiferromagnetic one.
7
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X-Ray Diffraction, Mössbauer Spectroscopy, and Magnetoelectric Effect Studies of Multiferroic Bi₅Ti₃FeO₁₅ Ceramics

88%
Pikula T., Guzdek P., Dzik J., Lisinska-Czekaj A., Jartych E.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
296-299
EN
Bi₅Ti₃FeO₁₅ ceramics belongs to multiferroic class of materials. In this work it was prepared by solid-state sintering method and investigated by X-ray diffraction, Mössbauer spectroscopy, and magnetoelectric effect measurements. As it was proved by X-ray diffraction studies the single-phase Bi₅Ti₃FeO₁₅ compound was obtained. The Mössbauer investigations revealed paramagnetic character of the compound at room temperature as well as at 80 K. Magnetoelectric measurements were carried out at room temperature using lock-in dynamic method and they proved presence of magnetoelectric coupling in this material. Additional magnetoelectric studies were carried out after subsequent electric poling of the sample. It was found that the maximum value of the coupling coefficient was almost twice bigger than in the case without the initial poling and reached a value of α_{ME} ≈ 20.7 mV cm⁻¹ Oe⁻¹.
8
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Mössbauer Study of Mechanosynthesized and Thermally Treated Co-Fe-Ni Alloys

76%
Pikula T., Oleszak D., Pękała M., Mazurek M., Żurawicz J., Jartych E.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1545-1553
EN
Mechanical alloying was used to prepare Co_{40}Fe_{60}, Co_{60}Fe_{35}Ni_{5}, Co_{40}Fe_{45}Ni_{15}, and Co_{40}Fe_{35}Ni_{25} alloys from the elemental powders. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc or fcc lattice and the average grain size between 20 and 50 nm. After heating of the alloys up to 993 K, the mixtures of two solid solutions with bcc and fcc lattices were formed in the case of Co-Fe-Ni alloys. Thermal treatment did not influence the type of the lattice of Co_{40}Fe_{60} alloy. The Mössbauer spectroscopy revealed hyperfine magnetic field distribution ranged from 33 to 38 T for Co_{40}Fe_{60} alloy and from 30 to 37 T for Co-Fe-Ni alloys. In the case of two-phase alloys, distributions were decomposed into two simple Gaussian functions using the numerical fitting. Magnetic measurements allowed to determine the effective magnetic moments and the Curie temperatures of the obtained alloys.
9
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Structure and Magnetic Properties of Bi5Ti3FeO15 Ceramics Prepared by Sintering, Mechanical Activation and Edamm Process. A Comparative Study

64%
Jartych E., Pikula T., Mazurek M., Franus W., Lisińska-Czekaj A., Czekaj D., Oleszak D., Surowiec Z., Aksenczuk A., Calka A.
Archives of Metallurgy and Materials
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2016
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issue 2
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