Search results for: A. Bajorek

Items from 1 to 20 out of 37 results

article

Microstructural analysis, dielectric properties and room temperature magnetic ordering of Pr-doped ZnO nanoparticles

N. Bhakta, A. Bandyopadhyay, A. Bajorek, P. K. Chakrabarti

Applied Physics A > 2019 > 125 > 12 > 1-12

Praseodymium (Pr ion)-doped zinc oxide nanoparticles (Zn_1−xPr_xO, x = 0.00, 0.02, 0.05) were prepared by chemical co-precipitation method. The as-dried samples were annealed at 400 °C for 6 h duration in vacuum (10⁻² mm of Hg). Crystallographic phase formation of each prepared sample is determined by matching the peak positions of the observed X-ray diffractograms with those of JCPDS file no. 76-0206...

article

Corrosion Properties of Ca65-xMg17.5Zn17.5+x (x = 0, 2.5, 5) Alloys

R. Babilas, P. Wojciechowski, A. Bajorek, P. Sakiewicz, more

Archives of Metallurgy and Materials > 2019 > Vol. 64, iss. 3 > 1033--1040

The aim of the paper is to study the effect of zinc addition on the corrosion behavior of Ca_65-xMg_17.5Zn_17.5+x(x = 0, 2.5, 5 at.%) alloys in simulated physiological fluids at 37°C. The electrochemical measurements allowed to determine a corrosion potential, which showed a positive shift from –1.60 V for Ca₆₅Mg_17.5Zn_17.5alloy to –1.58 V for Ca₆₀Mg_17.5Zn_22.5alloy, adequately. The more significant decrease...

article

Magnetic Hardening Induced in RCo₅ (R = Y, Gd, Sm) by Short HEBM

P. Łopadczak, A. Bajorek, K. Prusik, M. Zubko, more

Acta Physica Polonica A > 2018 > 133 > 3 > 688-690

The paper is focused on the magnetic and structural properties of RCo₅ (R = Y, Gd, Sm) intermetallics fabricated by high energy ball - milling (HEBM). The investigated samples were first produced by arc-melting as bulk materials and then were milled for 1h in dimethylformamide with balls to powder ratio 10:1. The influence of the HEBM parameters on the microstructure was investigated by a variety...

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Influence of Substitution and Milling on Structural and Magnetic Properties of Selected Sm(Ni_{1-x}Co_{x})₃ Compounds

M. Sikora, D. Blachliński, K. Ociepka, K. Prusik, more

Acta Physica Polonica A > 2018 > 133 > 3 > 486-488

The influence of substitution of Co for Ni in Sm(Ni_{1-x}Co_{x})₃, where x=0.0, 0,1, 0.2, on the structural and magnetic properties has been investigated. Samples with x= 0.0 and 0.2 were subjected to grinding in a high energy ball mill. The presence of a PuNi₃ type of crystal phase was evidenced for bulk crystalline and powders specimens. With an increase in the cobalt content, an increase at T_{c}...

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Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_{1-x}T_{x})₃ (T = Fe, Co) Intermetallic Compounds

A. Bajorek, G. Chełkowska

Acta Physica Polonica A > 2018 > 133 > 3 > 470-472

The low-field magnetic properties of polycrystalline Gd(Ni_{1-x}T_{x})₃ (T = Fe, Co) intermetallic compounds are presented. The whole system crystallizes in the rhombohedral PuNi₃ type of crystal structure. The composition dependence of the Curie temperature T_{C}(x) is associated with the change in the number of 3d electrons. Moreover, the field cooled and zero field cooled (FC-ZFC) curves at low...

article

Structural and electrochemical characterization of the Ca50Mg20Cu25Zn5 amorphous alloy

R. Babilas, A. Bajorek, Ł. Hawełek, W. Głuchowski, more

Journal of Non-Crystalline Solids > 2017 > 471 > C > 467-475

The quaternary Ca₅₀Mg₂₀Cu₂₅Zn₅ metallic glass in the form of ribbons and plates was successfully fabricated by melt-spinning and copper-mold casting. The structure characterization of the alloy in as-cast state was performed by using X-ray diffraction method. The Reverse Monte Carlo modeling was carried out to obtain structural model of the alloy in the form of ribbon. Moreover, the corrosion behavior...

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Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi₂(Si_1-yGe_y)₂

T. Toliński, K. Synoradzki, A. Bajorek, G. Chełkowska, more

Applied Physics A > 2017 > 123 > 6 > 1-8

We report our studies of the intermediate compositions between CeNi₂Si₂ and CeNi₂Ge₂, i.e., the alloys CeNi₂(Si_1-yGe_y)₂ by means of the thermopower, electrical resistivity, specific heat, magnetic susceptibility, and X-ray photoemission measurements. CeNi₂Si₂ is a fluctuating valence system and CeNi₂Ge₂ is known to show the heavy fermion behaviour. The change of the temperature dependence of the resistivity...

article

Effect of Alloying on Magnetism and Electronic Structure of Gd(In_{1-x}Snₓ)₃ System - ab initio Study

J. Deniszczyk, A. Bajorek, G. Chełkowska, E. Zipper

Acta Physica Polonica A > 2015 > 127 > 2 > 427-429

We present the results of ab initio study of electronic and magnetic properties of Gd(In_{1-x}Snₓ)₃ alloys carried out with the use of FP-LAPW method. Our precise ab initio calculations for the first time uniquelly confirmed experimentally based predictions that the ground state magnetic structure of the alloys is antiferromagnetic and that upon the In/Sn substitution the magnetic structure undergo...

article

Analiza złożonych materiałów o strukturze włókien mineralnych w oparciu o nieinwazyjne metody spektroskopowe

W. Śmieszek-Lindert, A. Bajorek, J. Kubacki

Chemik > 2015 > Vol. 69, nr 7 > 411--418

W artykule przedstawiono skład chemiczny warstwy powierzchniowej i objętościowej wełny szklanej i skalnej. Analizy zostały przeprowadzone przy użyciu dwóch metod instrumentalnych (nieinwazyjnych technik), rentgenowskiej analizy fluorescencyjnej (XRF, X-Ray Fluorescence) i rentgenowskiej spektrometrii fotoelektronów (XPS, X-Ray Photoelectron Spectroscopy). Zaobserwowano, że skład wełny szklanej i skalnej...

article

Substituent and solvent effects on spectroscopic properties of 2-amino-1,3-dicyano-5,6,7,8-tetrahydronaphthalene derivatives

M. Józefowicz, A. Bajorek, M. Pietrzak, J.R. Heldt, more

Journal of Luminescence > 2014 > 153 > Complete > 152-161

In this article, we report the photophysical properties of six, newly synthesized donor-substituted 2-amino-1,3-dicyano-5,6,7,8-tetrahydronaphthalene fluorophores. The steady-state and time-resolved spectroscopic experiments have been used to investigate the substituent and solvent effects on the locally excited (LE) and intramolecular charge transfer (ICT) emission. We demonstrate that the spectroscopic...

article

X-ray photoemission, calorimetric, and electrical transport properties of CeCu4MnyAl1−y

K. Synoradzki, T. Toliński, G. Chełkowska, A. Bajorek, more

Journal of Alloys and Compounds > 2014 > 601 > Complete > 43-49

We report the X-ray photoemission spectra (XPS) and the electrical resistivity measurements for the transition Kondo lattice – spin-glass (SG) in the series CeCu ₄ Mn _y Al ₁₋ _y . The study includes additionally the low temperature (down to T=400mK) heat capacity results. The XPS measurements revealed that the Ce 4f states are well localized. Electrical resistivity studies...

article

Magnetic Properties of Tb(Ni_{1-x}Fe_{x})_{3} (x=0.2, 0.6) Crystalline Compounds and Powders

K. Ociepka, A. Bajorek, A. Chrobak, G. Chełkowska, more

Acta Physica Polonica A > 2014 > 126 > 1 > 180-181

In the paper we present and discuss magnetic properties of the Tb(Ni_{1-x}Fe_{x})_{3} (x=0.2, 0.6) crystalline compounds and their ball-milled powders. The investigated samples are polycrystalline and crystallize in the rhombohedral PuNi_{3} type of crystal structure. The Curie temperature of the material seems to be independent of particle size and is constant. The coercivity depends on the amount...

article

Hyperfine interactions in R_xGd_{1− x}Fe₃ intermetallics R = Tb, Y

M. Ka̧dziołka-Gaweł, A. Bajorek

Hyperfine Interactions > 2014 > 226 > 1-3 > 321-327

The structural and magnetic properties of rare earth iron intermetallic compounds Tb_xGd_1−xFe₃ and Y_xGd_1−xFe₃ (x = 0. 0, 0. 1, 0. 2, 0. 4, 0. 5, 0. 6, 0. 8, 1. 0) was studied by X-ray diffraction, the ⁵⁷Fe Mössbauer effect and SQUID measurements. All investigated compounds crystallize in the rhombohedral PuNi3-type of crystal structure. The investigation of magnetic properties of R_xGd_1−xFe...

article

Quantum-chemical calculations of the electronic structure of 2-amino-1,3-dicyano-5,6,7,8-tetrahydronaphthalene derivatives

M. Józefowicz, A. Bajorek, M. Pietrzak, J.R. Heldt

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2013 > 113 > Complete > 137-144

The UV–Visible absorption spectra of six, newly synthesized donor-substituted 2-amino-1,3-dicyano-5,6,7,8-tetrahydronaphthalene have been measured in methylcyclohexane (MCH) and assigned with the help of quantum-chemical calculations. Our calculations have been performed to assess information regarding the electronic state energy values, corresponding oscillator strengths, x-, y-, z-components of...

article

Influence of degree of methyl methacrylate polymerization on spectroscopic properties of ethyl 5-(4-aminophenyl)- and 5-(4-dimethylaminophenyl)-3-amino-2,4-dicyanobenzoate

M. Józefowicz, A. Bajorek, M. Pietrzak, B. Jędrzejewska, more

Journal of Luminescence > 2013 > 134 > Complete > 414-422

The influence of degree of methyl methacrylate (MM) polymerization on the both emission modes (LE—locally excited and ICT—intramolecular charge transfer) of the fluorescence spectrum of ethyl 5-(4-aminophenyl)-3-amino-2,4-dicyanobenzoate (EAADCy) and ethyl 5-(4-dimethylaminophenyl)-3-amino-2,4-dicyanobenzoate (EDMAADCy) has been studied using steady-state and time-resolved spectroscopic technique...

article

Magneto-History Effect in the Tb_{x}Gd_{1-x}Ni_3 Compounds

A. Bajorek, G. Chełkowska, A. Chrobak, M. Kwiecień-Grudziecka

Acta Physica Polonica A > 2012 > 121 > 5-6 > 1136-1138

The compounds Tb_{x}Gd_{1-x}Ni_3 with a PuNi_3-type structure have been obtained. The magnetic properties have been investigated by using SQUID magnetometer (Quantum Design MPMS, temperature from 1.9 K to 300 K and magnetic field up to 7 T). The partial replacement of Gd by Tb atoms is reflected in a decrease of the ordering temperature from 115 K (x = 0.0) to 81 K (x=1.0) as well as the increase...

article

Electrical Resistivity and Electronic Structure of the Tb_{x}Gd_{1-x}Ni_3 System

G. Chełkowska, A. Bajorek, A. Chrobak, M. Kwiecień-Grudziecka

Acta Physica Polonica A > 2012 > 121 > 5-6 > 1139-1141

In the paper the electric properties and electronic structure of the intermetallic Tb_{x}Gd_{1-x}Ni_3 compounds are presented. The partial replacement of Gd by Tb atoms causes the decrease of the Curie temperature (T_{C}) and the increase of the residual resistivity. According to the Matthiessen rule the scattering mechanisms in ρ(T) have been analyzed. Moreover, the reduced form of the electrical...

article

Effect of Tb/Gd Substitution on Crystal Structure and Exchange Interactions of Gd_{1 - x}Tb_{x}Ni_3 Intermetallic Compounds

A. Chrobak, A. Bajorek, G. Chełkowska

Acta Physica Polonica A > 2012 > 121 > 5-6 > 1132-1135

In the paper an influence of Tb/Gd substitution on crystal structure and exchange interactions of Gd_{1 - x}Tb_{x}Ni_3 (x = 0.0, 0.5, 0.8, 1.0) polycrystalline compounds have been studied. The crystal structure of all samples was checked at the room temperature by means of X-ray diffraction. Exchange integrals of R-R (J_{RR}), T-T (J_{TT}) and R-T (J_{RT}) atoms were evaluated from M(T) magnetization...

article

Effect of rare earth additions on magnetic properties of Fe82Nb2B14RE2 (RE=Y, Gd, Tb and Dy) amorphous alloys

A. Chrobak, V. Nosenko, G. Haneczok, L. Boichyshyn, more

Materials Chemistry and Physics > 2011 > 130 > 1-2 > 603-608

In the present paper the influence of RE alloying additions (Y, Gd, Tb and Dy) on magnetic properties (Curie temperatures, low temperature magnetization, zero field cooling–field cooling curves, domain structure, room temperature magnetostriction and magnetic permeability) of amorphous alloys of type Fe ₈₂ Nb ₂ B ₁₄ RE ₂ are carefully examined. It was shown that substituting...

article

Magnetic properties, crystal and electronic structure of GdNi5−xCux series

A. Bajorek, G. Chełkowska, B. Andrzejewski

Journal of Alloys and Compounds > 2011 > 509 > 3 > 578-584

The effect of Ni/Cu substitution on the magnetic properties, crystal and electronic structure of the polycrystalline GdNi _5−x Cu _x series has been studied. All compounds crystallize in the hexagonal CaCu5 type of crystal structure (space group P6/mmm). The temperature dependence of magnetic phase transition (T _mag ) estimated from χ _AC (T) susceptibility as well as...

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Search results for: A. Bajorek

Microstructural analysis, dielectric properties and room temperature magnetic ordering of Pr-doped ZnO nanoparticles

Corrosion Properties of Ca65-xMg17.5Zn17.5+x (x = 0, 2.5, 5) Alloys

Magnetic Hardening Induced in RCo₅ (R = Y, Gd, Sm) by Short HEBM

Influence of Substitution and Milling on Structural and Magnetic Properties of Selected Sm(Ni_{1-x}Co_{x})₃ Compounds

Influence of Transition Metal Substitution on the Low-Field Magnetic Properties in the Gd(Ni_{1-x}T_{x})₃ (T = Fe, Co) Intermetallic Compounds

Structural and electrochemical characterization of the Ca50Mg20Cu25Zn5 amorphous alloy

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi₂(Si_1-yGe_y)₂

Effect of Alloying on Magnetism and Electronic Structure of Gd(In_{1-x}Snₓ)₃ System - ab initio Study

Analiza złożonych materiałów o strukturze włókien mineralnych w oparciu o nieinwazyjne metody spektroskopowe

Substituent and solvent effects on spectroscopic properties of 2-amino-1,3-dicyano-5,6,7,8-tetrahydronaphthalene derivatives

X-ray photoemission, calorimetric, and electrical transport properties of CeCu4MnyAl1−y

Magnetic Properties of Tb(Ni_{1-x}Fe_{x})_{3} (x=0.2, 0.6) Crystalline Compounds and Powders

Hyperfine interactions in R_xGd_{1− x}Fe₃ intermetallics R = Tb, Y

Quantum-chemical calculations of the electronic structure of 2-amino-1,3-dicyano-5,6,7,8-tetrahydronaphthalene derivatives

Influence of degree of methyl methacrylate polymerization on spectroscopic properties of ethyl 5-(4-aminophenyl)- and 5-(4-dimethylaminophenyl)-3-amino-2,4-dicyanobenzoate

Magneto-History Effect in the Tb_{x}Gd_{1-x}Ni_3 Compounds

Electrical Resistivity and Electronic Structure of the Tb_{x}Gd_{1-x}Ni_3 System

Effect of Tb/Gd Substitution on Crystal Structure and Exchange Interactions of Gd_{1 - x}Tb_{x}Ni_3 Intermetallic Compounds

Effect of rare earth additions on magnetic properties of Fe82Nb2B14RE2 (RE=Y, Gd, Tb and Dy) amorphous alloys

Magnetic properties, crystal and electronic structure of GdNi5−xCux series

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