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1
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Stability of Ferrous Fumarate in Medicaments for Women: Application of Mössbauer Spectroscopy

100%
Kądziołka-Gaweł M., Wojtyniak M.
Acta Physica Polonica A
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2016
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vol. 129
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issue 6
1242-1244
EN
Determination of the iron state (Fe²⁺ or Fe³⁺) and content of iron in commercial pharmaceutical products containing ferrous fumarate FeC₄H₂O₄ was made by the Mössbauer spectroscopy and X-ray fluorescence method. Also, influence of thermal treatment on stability of ferrous fumarate in selected medicaments has been investigated. The investigated samples were annealed in definite temperature: 373, 473, and 573 K for 5 h. Room temperature Mössbauer spectra of initial samples gave clear evidence that two phases of iron were presented. The major component was connected with ferrous fumarate with a contribution from ≈85% to ≈50%, depending on investigated medicaments. Ferrous fumarate was stable up to annealing temperature 473 K. Above this temperature significant oxidation of Fe²⁺ to Fe³⁺ was observed.
2
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⁵⁷Fe Hyperfine Parameters in Vitamins and Dietary Supplements

100%
Kądziołka-Gaweł M., Michałowska M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
653-655
EN
Mössbauer (nuclear gamma-resonance) spectroscopy was used to study various industrial samples of vitamins and dietary supplements containing iron ions, which are used in the anemia treatment. Determination of the iron state (Fe²⁺ or Fe³⁺) in medicaments is important for the pharmaceuticals evaluation quality. The investigated samples contain ferrous fumarate, ferrous gluconiate and ferric diphosphate. ⁵⁷Fe hyperfine parameters of the studied pharmaceuticals indicate that there exist major iron ferrous and ferric compounds. However, Mossbauer spectra of the investigated samples demonstrated the presence of additional ferrous and ferric components, probably related to impurities or to a partially modified main component.
3
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Mössbauer Study on Local Atomic Structure in Fe_{80-x}Nb_xB_{20} (x=4, 6) Metallic Glasses

100%
Babilas R., Kądziołka-Gaweł M.
Acta Physica Polonica A
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2016
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vol. 129
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issue 2
190-192
EN
Fe-based amorphous alloys were prepared by the melt-spinning technique and characterized by X-ray diffraction and transmission Mössbauer spectroscopy. The studies were performed on Fe₇₆Nb₄B₂₀ and Fe₇₄Nb₆B₂₀ metallic glasses in the form of ribbons. The Mössbauer spectroscopy allows to study the local environments of the Fe atoms in the glassy state, showing the changes in the amorphous structure due to the changing of Nb addition. The obtained Mössbauer spectra of ferromagnetic metallic glasses present broad lines resulting from the distribution of non-equivalent iron sites and of interatomic distances. Variation of Nb content in the alloys affects the disorder in as-cast state and also influences on the average radius of the first coordination shell and the number of nearest neighbor Fe atoms.
4
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Structural Study and Crystallization Behaviour of Fe_{62-x}CoₓNb₈B₃₀ Metallic Glasses (x=0, 20)

100%
Babilas R., Kądziołka-Gaweł M.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
901-904
EN
The paper presents the structural analysis of Fe_{62-x}CoₓNb₈B₃₀ metallic glasses (x=0, 20) in as-cast and after crystallization state. The studies were performed on metallic glasses of ribbon form: with thickness of 0.05 and 0.06 mm. The structure analysis of the samples in as-cast state and phase analysis of studied alloys after annealing was carried out by the X-ray diffraction methods. Moreover, the Mössbauer spectroscopy was also used to investigate the local structure for examined alloys. The soft magnetic properties examination covered the initial magnetic permeability. The after-effects of magnetic permeability were also conducted.
5
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The Influence of Nb Atoms on the Crystallization Process of Fe-B-Nb Amorphous Alloys

100%
Babilas R., Kądziołka-Gaweł M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
573-575
EN
The ferromagnetic Fe-based amorphous alloys have been studied due to the attractive properties for soft magnetic applications. Depending on different Nb concentration, we studied the formation of crystalline phases in annealed samples of amorphous metallic alloys for Fe_{80-x}B₂₀Nbₓ (x=0, 4, 10). The nature of the crystallization products as well as the phase structure were determined by using the Mössbauer spectrometry combined with X-ray diffraction and differential scanning calorimetry results. Substitution of Fe atoms by Nb lead to significant changes in hyperfine magnetic field (B_{hf}) distributions in as-quenched amorphous alloys Fe_{80-x}B₂₀Nbₓ, for x=10 the minimal value of B_{hf} is observed. Addition of this element causes shift of crystallization process towards higher temperatures and induces formation of phase complex including the α -Fe, Fe₂B and Fe₃B. Combination of X-ray diffraction and Mössbauer spectroscopy is very useful method in studying the structural environment of Fe atoms on a nearest-neighbor length scale.
6
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The Crystal and Magnetic Properties of Some Fe-Nb-B-Ni Alloys

100%
Kądziołka-Gaweł M., Chrobak A.
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EN
The crystal and magnetic properties of (Fe₈₀Nb₆B₁₄)_{1-x}Niₓ (x = 0.1, 0.2 and 0.4) bulk alloys prepared by making use of mould casting technique have been studied by X-ray diffraction, magnetostatic and Mössbauer effect methods. Structural and magnetic properties of investigated bulk alloys have been compared with polycrystalline Fe_{1-x}Niₓ (x = 0.1, 0.2 and 0.4) alloys. The measurements have shown that the crystal and magnetic nonhomogeneity for bulk alloys are higher than in polycrystalline compounds, which confirms many magnetic wide magnetic hyperfine field distribution. The mean diameters of crystallites for (Fe₈₀Nb₆B₁₄)_{1-x}Niₓ alloys was calculated from X-ray line broadening and were bigger than 10 nm. The mean magnetic moment and average magnetic hyperfine fields decrease with increase of nickel concentration in investigated compounds.
7
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Mössbauer Investigations and Photoemission Studies of the Fe 3s Spin Splitting in Some Fe-Ni Alloys

81%
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.
8
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The Crystal Structure and Magnetic Properties οf Selected fcc FeNi and Fe_{40}Ni_{40}B_{20} Alloys

81%
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.
9
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Mössbauer Study of Some Intermetallic Compounds Fe_{80-x}Ni_{x}B₂₀ (x=8, 16, 24, 28)

81%
Kądziołka-Gaweł M., Babilas R., Granek K.
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EN
Fe-based nanocrystalline alloys were prepared by the melt-spinning technique and characterized by X-ray diffraction, magnetostatic and Mössbauer effect methods. The Mössbauer spectroscopy allows to study the local environment of the Fe atoms in the investigated Fe_{80-x}Ni_{x}B₂₀ (x=8, 16, 24, 28) compounds and showing the changes in the structure due to the changing of Ni addition. Combination of X-ray diffraction and Mössbauer spectroscopy results confirm formation of different number of phase complex, including the α-FeNi, γ-FeNi, FeB, Fe₂B, Fe₃B in the investigated materials together with increase of Ni content.
10
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Magnetic Properties and Structure after Crystallization of Fe_{80-x}B_{20}Nb_{x} (x=4, 6, 10) Metallic Glasses

71%
Nowosielski R., Kądziołka-Gaweł M., Gębara P., Szyba D., Babilas R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1212-1216
EN
The ferromagnetic Fe-based amorphous alloys were studied due to properties for soft magnetic applications. Depending on different Nb addition, the formation of crystalline phases after annealing of amorphous Fe_{80-x}B₂₀Nb_{x} (x = 4,6,10) alloys was studied. The crystallization products as well as the phase structure were determined using the Mössbauer spectrometry combined with differential scanning calorimetry and magnetic measurements. The addition of Nb caused a shift of crystallization process towards higher temperatures and induced changes in coercive force and decreased the saturation magnetization. It was found that Nb addition changed the crystallization process from single crystallization for Fe₇₆B₂₀Nb₄ alloy to binary crystallization in the Fe₇₄B₂₀Nb₆ and Fe₇₀B₂₀Nb₁₀ glasses. The annealing process at the onset crystallization temperature induced complex phase formation including the α-Fe, Fe₃B, and Fe₂B phases for alloys x=4, 6.
11
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Influence of Transition and Rare Earth Elements on Magnetic Properties of Fe-Nb-B-M (M~=~Ni, Ag, Gd,~Tb) Bulk Nanocrystalline Alloys

62%
Ziółkowski G., Randrianantoandro N., Chrobak A., Klimontko J., Kądziołka-Gaweł M., Haneczok G.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1266-1269
EN
In this work we present magnetic properties of the (Fe_{80}Nb_6B_{14})_{1-x}M_x (where M = Ni, Ag, Gd, Tb and x = 0.08, 0.16, 0.32) bulk nanocrystalline alloys prepared by making use of mould casting technique. The applied preparation technique is favorable to nanocrystallization of the alloys with mean diameters of crystallites ranged from about 10 nm to 30 nm. Phase identification reveals a formation of ternary RE_2Fe_{14}B and binary REFe_2 phases dependently on the alloy composition. It was found that for the alloys with Ag addition magnetic moment of Fe atom increases from 2.26 μ_{B} to 3.36 μ_{B} for x = 0.08 and x = 0.32, respectively. For Ni addition this quantity decreases with increasing x due to appearing of Fe-Ni (fcc) phases. For Gd, Tb additions the alloys are ferrimagnetic with compensation composition ranged between x = 0.08 and x = 0.16. The both rare earth alloying additions cause a significant magnetic hardening especially in the case of Tb.
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