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Structural and Thermomagnetic Properties of Fe_{86-x}Zr₇M_xNb₂Cu₁B₄ (M = Co, Ni, (CoCr); x=0 or 6) Amorphous Alloys

100%
Łukiewska A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
738-740
EN
The effect of the substitution of Co, Ni or (CoCr) for the part of Fe atoms on the thermal stability and some magnetic properties, i.e. magnetization and magnetocaloric effect of Fe_{86-x}Zr₇M_xNb₂Cu₁B₄ (M = Co, Ni, (CoCr); x=0 or 6) alloys was investigated. From X-ray studies it was stated that the investigated alloys in the as-quenched state and after the accumulative annealing for 10 min at 600 K and then 700 K were fully amorphous. The amorphous as-quenched Fe₈₀Zr₇Ni₆Nb₂Cu₁B₄ alloy shows the lowest thermal stability and the onset of its crystallization temperature is equal to 775 K. The Arrott plots are almost linear and show positive slope near the Curie temperature. The maximum magnetic entropy change is very sensitive to the chemical composition and annealing conditions of the alloys.
2
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Magnetocaloric Effect in Amorphous and Partially Crystallized Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ Alloy

51%
Łukiewska A., Olszewski J., Hasiak M., Gębara P.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
676-679
EN
In the present work the microstructure and thermomagnetic properties of Fe₈₀Zr₇Cr₆Nb₂Cu₁B₄ ribbon in the as-quenched state and after the accumulative annealing in the temperature range 600-800 K for 10 min were studied using Mössbauer spectroscopy and vibrating sample magnetometry. The second order phase transition from ferro- to paramagnetic state is observed. The Curie temperature T_{C} defined as inflection point on the magnetization versus temperature curve recorded on zero-field cooled mode equals 262.5 K for the as-quenched material. With increasing the annealing temperature increase of T_{C} is observed. The maximum value of the magnetic entropy change (-ΔS) observed in the vicinity of the Curie point is equal to 0.85 J/(kg K) for the alloy in the as-quenched state. Moreover, for the samples annealed up to 750 K for 10 min the low intensity maximum at about 190 K related to the supplementary magnetic phase is observed. The presence of this phase was confirmed as additional component visible on hyperfine field distributions of Mössbauer spectra.
3
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Low Field Magnetic Properties of FeCo-Based Alloys

45%
Hasiak M., Miglierini M., Łukiewska A., Kaleta J., Zbroszczyk J.
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vol. 126
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issue 1
118-119
EN
Low field magnetic properties of amorphous (Fe_{x}Co_{1})_{76}Mo_{8}Cu_{1}B_{15} alloys (x=3, 6 and 9) were characterized by magnetic after-effect and initial magnetic susceptibility. Activation energies and pre-exponential factors of the Arrhenius law that were derived from the disaccommodation curves are of about 1.188 eV and 10^{-15} s, respectively. Local magnetic arrangement was investigated by ^{57}Fe Mössbauer spectrometry. The average hyperfine magnetic field decreases with increasing Fe/Co ratio due to smaller relative contribution of cobalt. The overall magnetic parameters of the alloy prove its good soft magnetic properties with an application potential.
4
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Thermal Stability and Crystallization οf Iron and Cobalt - Based Bulk Amorphous Alloys

33%
Olszewski J., Zbroszczyk J., Sobczyk K., Ciurzyńska W., Brągiel P., Nabiałek M., Świerczek J., Hasiak M., Łukiewska A.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1659-1666
EN
Microstructure by the Mössbauer spectroscopy and approach to magnetic saturation in the bulk amorphous Fe_{61}Co_{10}Me_7Y_2B_{20} (Me_7=Y_7, Y_6Ti_1 or Zr_{2.5}Hf_{2.5}W_2) alloys are investigated. The bulk amorphous Fe_{61}Co_{10}Zr_{2.5}Hf_{2.5}W_2Y_2B_{20} alloy exhibits the best thermal stability and remains amorphous up to 901 K. Moreover, the quasi-dislocations dipoles present in this amorphous alloy have the largest width equal to 6.7 nm. After annealing this alloy below the crystallization temperature the enhancement of both the average hyperfine field and its standard deviation is observed which points to the increase in the atom packing density due to the decay of quasi-dislocation dipoles. After the annealing at 901 K the small amount of the crystalline α-FeCo phase is presented in this alloy. The same crystalline phase appears in the bulk Fe_{61}Co_{10}Y_8Ti_1B_{20} and Fe_{61}Co_{10}Y_9B_{20} alloys after annealing at 750 K and 840 K, respectively.
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