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1
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Magnetic Properties of Nd_{12}Fe_{82}B_6 and Nd_{14}Fe_{80}B_6 Powders Obtained by High Temperature Milling

100%
Kaszuwara W., Michalski B.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
89-93
EN
The present paper describes a comparison of magnetic properties of Nd_{12}Fe_{82}B_6 and Nd_{14}Fe_{80}B_6 powders obtained by a new method of processing of Nd-Fe-B powders - high temperature milling. In this method the milling operation is carried out, entirely or only in the final stage, at high temperatures, so that the destruction of the Nd_2Fe_{14}B phase and its recombination occur simultaneously. In this way a powder with good magnetic properties immediately after milling was obtained. In the present experiments, the powder was subjected to high-energy milling for 17 h (until the material becomes amorphous) and then, the milling was continued for 0.5 h with the powder container being heated to an appropriate temperature or milled at high temperature during whole time of the process. Diffraction examinations have shown that the powder processed in this way contains the Nd_2Fe_{14}B phase. Its magnetic properties appear to depend on the applied temperature or milling time (at optimum temperature). The used method of processing leads to obtaining high-coercivity Nd-Fe-B powders. The magnetic properties of the material thus produced, in particular its coercivity, strongly depend on the milling temperature and milling time.
2
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Dependence Of The Structure And Magnetic Properties Of Cast Plate-Shaped Nd60Fe30Al10 Samples On Their Thickness

81%
Kaszuwara W., Michalski B., Latuch J., Pawlik P.
Archives of Metallurgy and Materials
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2015
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issue 3
3
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Structure and Properties of Nd-Fe-B Alloy Subjected to HDDR Process

81%
Szymański M., Michalski B., Leonowicz M., Miazga Z.
Archives of Metallurgy and Materials
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2016
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issue 1
4

Vascular endothelial growth factor (VEGF) and its contribution to carcinogenesis

81%
Loch T., Michalski B., Mazurek U., Graniczka M.
Postępy Higieny i Medycyny Doświadczalnej
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2001
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vol. 55
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issue 2
257-274
EN
This review concerns structural and functional properties of human vascular endothelial growth factor as well as the process of alternative splicing of its transcript. Regulation of VEGF gene transcription and participation of the protein in the angiogenesis of tumours are also broadly discussed.
5
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Complex Characteristics of Sintered Nd-Fe-B Magnets in Terms of Hydrogen Based Recycling

81%
Szymański M., Michalski B., Leonowicz M., Miazga Z.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1270-1273
EN
Sintered Nd-Fe-B magnets, dismantled by the P.P.H.U. Polblume company from scrap hard disc drives and medical device, were thermally demagnetized and analyzed in terms of their chemical composition, structure and magnetic properties. Magnets from hard disc drives drives had a magnetic structure of two opposite poles in a plane of a magnet and were covered with a nickel coating (around 50 μ m in thick), which however was often discontinuous and deeply scratched. The majority of the magnets were partially destroyed (broken or corroded). The magnet from hard disc drives were basically made of iron (65±1 wt%) and neodymium (30±2 wt%) however, they also included alloying elements such as Co (1-2.5 wt%), Dy (0-1 wt%) or Pr (0-5 wt%). The magnets from medical device consisted only of iron (65±1 wt%) and neodymium (34±1 wt%). Magnets of both kinds were textured thus their XRD patterns were amended. Diffraction patterns, typical for the Nd₂Fe₁₄B (φ) phase, were achieved after mechanical crushing of the bulk magnets. A regular X-ray diffraction pattern was achieved after mechanical crushing of the magnets. The microstructure of both types of the magnets, observed by scanning electron microscopy, consisted of grey grains of a Nd₂Fe₁₄B (φ) phase and a Nd-rich grain boundary phase. The magnets from hard disc drives exhibited excellent magnetic properties and anisotropy: maximum energy product above 300 kJ/m³, remanence around 1.4 T and coercivity around 1000 kA/m, slightly varying between each magnet. Magnetic properties of medical magnet were only a little worse: maximum energy product above 200 kJ/m³, remanence around 1.1 T and coercivity around 900 kA/m. Hydrogen disproportionation phase diagrams (temperature vs. pressure) were constructed for both kinds of the magnets, revealing possible conditions for the hydrogenation, disproportionation, desorption and recombination reaction.
6
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High-coercivity Nd-Fe-B Powders Obtained by High-Temperature Milling

81%
Kaszuwara W., Michalski B., Orlowski P.
Archives of Metallurgy and Materials
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2014
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issue 1
7
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Measurements of Magnetocaloric Effect in LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x} (x=0.1, 0.2, 0.3) Alloys

81%
Gębara P., Pawlik P., Michalski B., Wysłocki J.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
576-578
EN
In the present work, phase constitution and thermomagnetic properties of LaFe_{11.14}Co_{0.66}Si_{1.2-x}Al_{x} (where x = 0.1, 0.2, 0.3) alloys were investigated. Ingot samples were obtained by arc-melting under the low pressure of Ar atmosphere. Subsequently samples were annealed at 1323 K for 15 days. X-ray diffraction of all samples revealed coexistence of two crystalline phases dominant La(Fe,Si)_{13}-type and minor bcc α -Fe. Furthermore, the magnetic measurements at various temperatures allowed to study the Curie temperature, magnetic entropy changes and relative cooling power.
8
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Influence of Nb Addition on Magnetic Properties of the Nanocrystalline (Nd₁₀Fe₆₇B₂₃)_{100-x}Nbₓ (where x = 1, 2, 4) Alloy Ribbons

71%
Szwaja M., Pawlik K., Pawlik P., Gębara P., Michalski B.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
623-625
EN
In the present work the magnetic properties and phase constitution of (Nd₁₀Fe₆₇B₂₃)_{100-x}Nbₓ (where x = 1, 2, 4) alloys in the form of ribbons were investigated. The base alloys were prepared by arc-melting the high purity elements with pre-alloyed Fe-B under an Ar atmosphere. The ribbon samples were obtained by controlled atmosphere melt-spinning technique. In order to generate the nanocrystalline microstructure and hard magnetic properties, samples were annealed at various temperatures (from 923 K to 1023 K) for 5 min. The aim of the present work was to determine the influence of Nb admixture and annealing conditions on the phase constitution and magnetic properties.
9
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Effect of Ga Addition on Structure and Magnetic Properties of the LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x} (x=0.1, 0.2, 0.3) Alloys

71%
Gębara P., Pawlik P., Michalski B., Wysłocki J., Kotynia K.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
87-90
EN
In the present work, the phase constitution and magnetic properties of the LaFe_{11.14}Co_{0.66}Si_{1.2-x}Ga_{x} (where x=0.1, 0.2, 0.3) alloys, were investigated. It was revealed that increase of Ga content in the alloy composition causes the rise of lattice parameter of the La(Fe,Si)_{13}-type phase, which causes increase of the Curie temperature. However, the increase of Ga addition leads to decrease of magnetocaloric effect.
10
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Microstructure and Properties of Magnets Obtained by Hydrostatic Extrusion of Nd-Fe-B Powder

61%
Gizynski T., Kaszuwara W., Pawlik P., Kulczyk M., Leonowicz M., Michalski B.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
626-628
EN
Nd-Fe-B MQ powder was initially densified in a copper capsule to reach about 60% of the theoretical density. Subsequently, three various processes of hydrostatic extrusion were conducted at room temperature. The values of true strain, obtained during the all three stages, were 1.38, 0.89, 0.94, respectively. The investigation performed showed that the coercivity of the material decreases as the strain increases. Decrease of the remanence was observed only for the highest strains. Size of the particles was strongly reduced during the extrusion processes. X-ray diffraction did not show changes in the phase structure of the material. The Mössbauer study, of the sample extruded within all the three stages, showed existence of the Nd₂Fe₁₄B phase and 16% of other phase. Analysis of magnetization versus temperature confirmed that the additional phase was ferromagnetic.
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