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1

Influence of SiO2/Al2O3 Molar Ratio on Phase Composition and Surfaces Quality of Aluminum Silicate Sanitary Glazes in the SiO2-Al2O3-CaO-Na2O System

100%

Leśniak M., Partyka J., Sitarz M.

Archives of Metallurgy and Materials

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2016

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issue 4

2

Formation of Accelerated Particle Beam in Isochronous Cyclotron

100%

Voronin A., Partyka J., Aldibekova A.

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vol. 125

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issue 6

1408-1411

EN

In the paper there are given calculated and experimental data which allow to form necessary beam parameters for a precise experiment in nuclear physics. An intensity of a beam extracted from an isochronous cyclotron acceleration chamber (E_{p} = 30 MeV) can reach 15 μA with an energy spread of 3 × 10^{-3}. Accelerated ion beams of such kind are widely applicable in nuclear physical experiments.

3

Crystal Structure and Chemical Characterization of La_{0.7}Sr_{0.3}Mn_{0.7}Ti_{0.3-x}Al_{x}O₃ (0 ≤ x ≤ 0.15) Compounds

88%

Troyanchuk I., Bushinsky M., Tereshko N., Fedotova V., Partyka J.

Acta Physica Polonica A

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2017

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vol. 132

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issue 2

240-244

EN

Neutron powder diffraction and magnetization measurements have been performed for La_{0.7}Sr_{0.3}Mn_{0.7}Ti_{0.3-x}Al_xO₃ (0 ≤ x ≤ 0.15) stoichiometric compounds. Increase of the Al³⁺ content enlarges the Mn⁴⁺ ions fraction from 0% (x=0) up to around 20% (x=0.15). The x=0 composition around 150 K exhibits a structural transition from the rhombohedral phase to the orthorhombic one whereas the crystal structure of the compounds with x=0.1 and 0.15 remains to be rhombohedral down to 2 K. The substitution of Ti⁴⁺ by Al³⁺ ions is accompanied by a gradual increase in the bond angle Mn-O-Mn and decrease in the Mn-O bond length which lead to enhancement of the covalent component of the chemical bond. All these compounds exhibit ferromagnetic components below 100 K. Magnetic moments estimated per manganese from the neutron powder diffraction data are found to be around 1.3 μ_{B} (x=0) and 1.7 μ_{B} (x=0.1 and 0.15) at 2 K. It is suggested that ferromagnetism is originated predominantly from the Mn³⁺-O-Mn³⁺ and Mn³⁺-O-Mn⁴⁺ superexchange interactions whereas bond angles fluctuation leads to magnetic frustrations. Enhancement of covalence slightly increases ferromagnetism.

4

Composition and Microstructure of Surface Layers Produced by Ion Beam Assisted Deposition of Metals from a Pulsed Arc-Discharge Plasma onto Aluminum Substrates

88%

Poplavsky V., Komarov F., Luhin V., Pil'ko V., Partyka J.

Acta Physica Polonica A

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2015

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vol. 128

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issue 5

946-948

EN

Ion beam assisted deposition of alloying metals (Zn, Cd, Zr, Cr) onto pure aluminum and aluminum alloy substrates from the plasma of a pulsed arc discharge for the purpose of materials corrosion stability was carried out. The Rutherford backscattering spectrometry, electron backscatter diffraction, scanning electron microscopy, and electron probe microanalysis methods were applied to investigate composition and microstructure of the prepared layers. It was found that the obtained layers are characterized by amorphous atomic structure and contain the atoms of deposited metal, substrate material components, as well as impurities of oxygen and carbon; their thickness was measured to be ≈ 30-100 nm.

5

Modification of Optical and Electrical Properties of PET Foils by He⁺, Ne⁺ and Ar⁺ Implantation

64%

Droździel A., Turek M., Pyszniak K., Prucnal S., Luchowski R., Grudziński W., Klimek-Turek A., Partyka J.

Acta Physica Polonica A

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2017

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vol. 132

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issue 2

264-269

EN

Thin (3 μm) polyethylene terephthalate (PET) foils were irradiated with 135 keV He⁺, Ne⁺ and Ar⁺ ions with the fluences up to 5×10¹⁵ cm¯². Changes of chemical structure of the polymer were studied with the Fourier transform infrared and Raman spectroscopy - breaking of numerous chemical bonds, polymer chain cross-linking as well as formation of sp² hybridised carbon clusters and cluster networks were demonstrated. The increase of the implanted sample absorbance with the implantation fluence in the UV-VIS spectra as well as the decrease of optical band-gap energy (2.75 and 2.0 eV for He and Ne, respectively, at 5×10¹⁵ cm¯²) are observed. Decrease of bulk resistance of heavily treated samples by ≈5 orders of magnitude is determined. Measurements of the sheet resistance confirm that the sample becomes conducting also on the reverse (unimplanted) side of the foil. Both of these effects depend on the impinging ion mass - they are the strongest for Ar. The increase of both ac conductance and dielectric constant is observed in the frequency range up to 2 MHz and these changes rise with the impinging ion mass.

6

Formation of Multilayered Ti-Hf-Si-N/NbN/Al_2O_3 Coatings with High Physical and Mechanical Properties

64%

Pogrebnjak A., Prozorova M., Kovalyova M., Kolisnichenko O., Beresnev V., Oyoshi K., Takeda Y., Kaverina A., Shypylenko A., Partyka J.

Acta Physica Polonica A

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2013

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vol. 123

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issue 5

813-815

EN

This work presents the first results on forming of multi-layered superhard coatings Ti-Hf-Si-N/NbN/Al_2O_3 and their properties as well as structure. Microstructure, elemental and phase compositions of multi-layered coatings obtained by different methods were investigated. There were used such methods as: scanning electron microscopy EDS JEM-7000F microscope (with microanalysis) for research of cross-section of coatings, with subsequent Auger-electron spectroscopy, X-ray diffraction analysis, optical inverted microscope Olympus GX51, electron-ion microscopes Quanta 200 3D and Quanta 600 (scanning electron microscopy), equipped by the detector of X-ray radiation of the system PEGASUS 2000. It was stated that hardness of coatings has reached 56 GPa, and at the same time the factor of wearing during friction was the smallest - 2.571×10^{-5}. It was also noted that nitrogen pressure in the chamber at the deposition of the top layer significantly influences on the properties of samples. For example, the coefficient of friction at P=0.3 Pa from 0.2 at the beginning of track to 0.001 (during the tests), and at the pressure of nitrogen P=0.8 Pa, the coefficient of friction was equal to 0.314 at the beginning of track and 0.384 at the end (during the tests).

7

Influence of Deposition Parameters and Thermal Annealing on the Structure and Properties of Nitride Coatings (TiHfZrVNb)N

64%

Pogrebnjak A., Abadias G., Chartier P., Bondar O., Yakuschenko I., Takeda Y., Krause-Rehberg R., Kolesnikov D., Beresnev V., Partyka J.

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vol. 125

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issue 6

1296-1299

EN

Results of structure, phase composition, physical and mechanical properties and tribological properties investigations of nitride high-entropy coatings (TiZrHfVNb)N are presented in the paper. Proton microbeam (μ-PIXE), X-ray diffraction method, including method of X-ray strains measurements, energy dispersive X-ray spectroscopy and scanning electron microscopy analysis, microhardness testing and nanoindentation were used. Thermal annealing (t=600°C) influence on defect profiles, structure and element distribution in the coatings was investigated. It was found that thermal treatment of coatings leads to changing of defect profiles and to element redistribution. Also we can say that it influences less on grain size changing. Investigated (TiZrHfVNb)N coatings demonstrate high values of hardness and excellent wear resistance.

8

Structure and Electron-Transport Properties of Photoresist Implanted by Sb^{+} Ions

64%

Vabishchevich N., Brinkevich D., Volobuev V., Lukashevich M., Prosolovich V., Sidorenko Y., Odzhaev V., Partyka J.

Acta Physica Polonica A

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2011

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vol. 120

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issue 1

46-48

EN

Morphology and electron-transport properties in the photoresist-silicon structures implanted by 60 keV antimony in the fluence range 1 × 10^{15} ÷ 5 × 10^{16} cm^{-2} with the ion current density 4 μA/cm^2 have been investigated. Microhardness increases with the increasing fluence. Non-monotonous dependence of microhardness on the depth in the implanted structures was observed. Transition from insulating to the metallic regime of conductivity was not observed.

Refine search results

Influence of SiO2/Al2O3 Molar Ratio on Phase Composition and Surfaces Quality of Aluminum Silicate Sanitary Glazes in the SiO2-Al2O3-CaO-Na2O System

Formation of Accelerated Particle Beam in Isochronous Cyclotron

Crystal Structure and Chemical Characterization of La_{0.7}Sr_{0.3}Mn_{0.7}Ti_{0.3-x}Al_{x}O₃ (0 ≤ x ≤ 0.15) Compounds

Composition and Microstructure of Surface Layers Produced by Ion Beam Assisted Deposition of Metals from a Pulsed Arc-Discharge Plasma onto Aluminum Substrates

Modification of Optical and Electrical Properties of PET Foils by He⁺, Ne⁺ and Ar⁺ Implantation

Formation of Multilayered Ti-Hf-Si-N/NbN/Al_2O_3 Coatings with High Physical and Mechanical Properties

Influence of Deposition Parameters and Thermal Annealing on the Structure and Properties of Nitride Coatings (TiHfZrVNb)N

Structure and Electron-Transport Properties of Photoresist Implanted by Sb^{+} Ions