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Mössbauer Investigations and Photoemission Studies of the Fe 3s Spin Splitting in Some Fe-Ni Alloys

100%
Kądziołka-Gaweł M., Zarek W., Talik E., Popiel E.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1493-1500
EN
The magnetic properties, crystal and electronic structure for Fe_{1-x}Ni_x (x=0.30, 0.325, 0.375) alloys and austenitic steel were studied using magnetostatic, Mössbauer effect methods, X-ray diffraction and X-ray photoelectron spectroscopy. The compositions of the investigated Fe-Ni alloys were chosen like that to exist on left, right and in inside of invar range. Two different magnetic moments (low and high) of Fe atom were observed. Measurement results do not show antiferromagnetic order in Fe-Ni alloys.
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The Crystal Structure and Magnetic Properties οf Selected fcc FeNi and Fe_{40}Ni_{40}B_{20} Alloys

100%
Kądziołka-Gaweł M., Zarek W., Popiel E., Chrobak A.
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issue 2
412-414
EN
The crystal structure and magnetic properties of polycrystalline alloys Fe_{62.5}Ni_{37.5}, Fe_{60}Ni_{40}, Fe_{50}Ni_{50} obtained by arc-melting and Fe_{40}Ni_{40}B_{20} alloy obtained by melt spinning technique were investigated by X-ray, magnetostatic and Mössbauer effect methods. The X-ray measurements show that Fe_{40}Ni_{40}B_{20} alloy has a face-centered structure (fcc) which means that boron did not cause an amorphous rendering. The lattice constants for this alloy (a = 3.53 Å) is smaller than for FeNi alloys (a > 3.57 Å) which suggests that boron atoms were built-in in the crystal lattice. The Curie temperature of this alloy is more than 150 K higher in comparison with the of FeNi alloys, but the magnetic moment connected with this alloy is more than 0.17 μ_{B}/atom smaller than the magnetic moments of FeNi alloys. The shape of hyperfine field distribution for Fe_{40}Ni_{40}B_{20} is similar to the shape of hyperfine field distribution for the investigated fcc Fe_{62.5}Ni_{37.5} alloy, but both are different from another investigated hyperfine field distribution of FeNi alloys.
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The Investigations of Chondritic Meteorites by X-ray Diffraction and Mössbauer Effect Methods

100%
Ludwig A., Zarek W., Popiel E.
Acta Physica Polonica A
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2001
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vol. 100
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issue 5
761-765
EN
The Mössbauer spectroscopy and X-ray diffraction techniques were used to investigate the mineral and magnetic fractions of two meteorites: carbonaceous chondrite named Allende (CV3) and ordinary chondrite - El Hammami (H5). The investigations of a powder mixture of chondrules and matrix show that the meteorites studied contain iron mainly in the silicates, olivine, and pyroxene. The metallic fractions of the El Hammami meteorite contain the ferromagnetic mineral kamacite (bcc iron-nickel alloy). This phase with cubic symmetry was identified by symmetric Mössbauer spectrum with disturbance in relative line intensities. The results suggest that the Allende meteorite does not contain a pure metallic phase.
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