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Wyświetlanie 1-15 z 38
Tytuł:
Control of Radiation Sensitivity of the Oxygen-Containing Fluorite Crystals
Autorzy:
Kachan, S.
Salapak, V.
Nahurskiy, O.
Pirko, I.
Powiązania:
https://bibliotekanauki.pl/articles/1030896.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.-x
78.47.-p
78.70.-g
Opis:
The parameters of radiation sensitivity of the oxygen-doped fluorite crystals were calculated in a one-dimensional model. The limit concentrations of the color centers as a function of the concentration of the oxygen impurity in the fluorite crystal were defined. Fluorite crystals with anti-Frenkel defects in the anion sublattice of the crystal have a specific property: the discolored after irradiation crystal being irradiated repeatedly with ionizing radiation retains the "memory" of the preceding irradiation. Using an ion chain model this paper studies under what conditions the "radiation memory" effect can arise in the MeF₂-O²¯ crystals as well as the extent of its contribution into the overall radiation sensitivity of the crystal.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 824-828
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Ion-Irradiation upon Microstructure and Magnetic Properties of NANOPERM-Type Fe₈₁Mo₈Cu₁B₁₀ Metallic Glass
Autorzy:
Hasiak, M.
Miglierini, M.
Powiązania:
https://bibliotekanauki.pl/articles/1030756.pdf
Data publikacji:
2018-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Bb
75.60.Ej
75.30.Kz
61.80.-x
76.80.+y
Opis:
Microstructure and soft magnetic properties of the Fe₈₁Mo₈Cu₁B₁₀ amorphous alloy in the as-quenched state and after irradiation with N⁺ ions are investigated. CEMS spectra show that the irradiated surface at the air side of the ribbons was significantly affected. On the other hand, no noticeable changes were observed at the opposite wheel side. More deep subsurface regions are also not altered as evidenced by CXMS spectra. Thermomagnetic measurements have shown presence of two magnetically different phases with well distinguished Curie points. They can be ascribed to the amorphous matrix and crystalline phases. The latter were quenched-in during the production process and/or induced by ion bombardment. Curie temperatures of the amorphous matrixes were calculated using the Heisenberg model. For the as-quenched and irradiated ribbons they are of 223 K and 228 K, respectively. The behaviour of coercivity versus temperature was also analysed.
Źródło:
Acta Physica Polonica A; 2018, 133, 3; 680-683
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of High Energy Ion Implantation on the Structure and Mechanical Properties of Aluminium Alloys
Autorzy:
Anishchik, V.
Poliak, N.
Ponaryadov, V.
Opielak, M.
Boiko, O.
Powiązania:
https://bibliotekanauki.pl/articles/1033770.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.Jh
61.80.-x
Opis:
The effect of implantation of Ne⁺, Kr⁺, and Bi⁺ ions over the energy range 26-710 MeV on the structural-phase state and the mechanical properties of the aluminum-based alloys (Al-Cu, Al-Cu-Mg, Al-Cu-Zn, Al-Mn) was studied. The revealed peculiarities of variations in the structure, phase composition, and mechanical properties of aluminum alloys are attributed to the electron deceleration of ions making the principal contribution to the formation of radiation defects which enhance the diffusion processes in the targets.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 291-294
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of the Stellite 6 Cobalt Alloy Implanted with Nitrogen Ions
Autorzy:
Budzyński, P.
Kamiński, M.
Wiertel, M.
Pyszniak, K.
Droździel, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030127.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
62.20.Qp
61.82.Bg
61.80.-x
Opis:
The effect of nitrogen ion implantation on Stellite 6 cobalt alloy was investigated. In this research, cobalt alloy was implanted with 65 keV nitrogen ions at the fluence of (1÷10)×10¹⁶ N⁺/cm². The distribution of implanted nitrogen ions and vacancies produced by them was calculated using the SRIM program. The surface morphology was examined and the elemental analysis was performed using scanning electron microscopy, energy dispersive X-ray spectroscopy and grazing incidence X-ray diffraction. The wear tests were conducted with the use of the pin-on-disc method. The results demonstrate that implantation with nitrogen ions significantly reduces the friction factor and wear. The friction coefficient of the implanted sample at the fluence of 1×10¹⁷ N⁺/cm² increased to the values characteristic of an unimplanted sample after 5000 measurement cycles. The depth of the worn trace was about 2.0 μm. This implies that the thickness of the layer modified by the implantation process is ≈2.0 μm and exceeds the initial range of the implanted ions by an order of magnitude. This is referred to as a long-range implantation effect. The investigations have shown that the long-range effect is caused by movement of not only implanted nitrogen atoms but also carbon dopant atoms towards the friction zone. Diffusion of carbon atoms has been documented here for the first time. Furthermore, the increased content of oxygen atoms on the track bottom indicates a dominant oxidative wear of the Stellite samples after nitrogen implantation with the energy 65 keV and the fluences of 5×10¹⁶ and 10¹⁷ N⁺/cm².
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 203-205
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of annealing and irradiation by heavy ions on optical absorption of doped lithium niobate crystals
Autorzy:
Potera, P.
Stefaniuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/1075585.pdf
Data publikacji:
2016-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.Gh
61.80.-x
78.20.-e
Opis:
The present work is devoted to investigation of optical absorption changes in Fe and Cu doped LiNbO₃ (LNO) single crystals induced during annealing in vacuum and air as well as under influence of the ²⁰⁹Bi ions irradiation with energy 11.4 MeV/u (MeV per nucleon) and a fluence 5×10¹¹ cm¯² at room temperature. The analysis of changes of absorption of the crystal during air annealing have been studied in the Arrhenius coordinates and activation energies have been determined.
Źródło:
Acta Physica Polonica A; 2016, 130, 3; 800-804
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural investigation of K-feldspar KAlSi₃O₈ crystals by XRD and Raman spectroscopy: An application to petrological study of Luc Yen pegmatites, Yen Bai province, Vietnam
Autorzy:
Huong, L.
Nhung, N.
Kien, N.
Zubko, M.
Häger, T.
Hofmeister, W.
Powiązania:
https://bibliotekanauki.pl/articles/1075745.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cp
78.30.-j
81.70.Jb
82.80.-d
91.65.-n
91.60.-x
Opis:
K-feldspars in pegmatites from Luc Yen gem mining area, Yen Bai province, Vietnam were studied by X-ray fluorescence, X-ray powder diffraction and the Raman spectroscopy. Chemical analysis determined the K-feldspars in the form: of (K_{0.8909}Na_{0.0388}Ca_{0.002}Pb_{0.0042}Cs_{0.0024}Rb_{0.0338})(Al_{0.9975}Fe_{0.0053}Ti_{0.0004})Si_{2.988}O₈. Both X-ray powder diffraction and Raman spectroscopy indicated Luc Yen K-feldspars as orthoclase phase. Together with the values of Al content of the T1 tetrahedral sites in orthoclase, it is understood that Luc Yen pegmatites are of young ages (Cenozoic) and shallow intrusive types.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 892-893
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental Gamma Dose Evaluation During Explosive Materials Analysis by PGNAA Technique Using MCNPX Code
Autorzy:
Nasrabadi, M.
Omidi, S.
Powiązania:
https://bibliotekanauki.pl/articles/1401224.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.52.-g
61.80.-x
78.70.-g
Opis:
Increased use of radiation in medicine, industry, and laboratories, requires safe conditions to be provided for its optimal use. One of the cases in which people are exposed to radiation, is during the detection of explosive materials by PGNAA method. Therefore, external dosimetry is necessary for workplaces where the method is used. In this study, Monte Carlo simulation program, MCNPX has been used to simulate gamma dose in the environment during the detection of explosive materials by PGNAA method. The simulated results were validated practically. The results indicate a good agreement between the simulated and measured data. The study demonstrated that MCNPX code can be used effectively for simulating gamma dose in various environments.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 961-964
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-Range Effect in Ion-Implanted Titanium Alloys
Autorzy:
Budzynski, P.
Sielanko, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402208.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ln
62.20.Qp
61.82.Bg
61.80.-x
Opis:
Surface modification of titanium alloy (Ti6Al4V) by nitrogen ion implantation and ion beam-assisted deposition (C, N) was investigated. The depth distribution of implanted nitrogen atoms was analysed using the Rutherford backscattering technique. Nitrogen implantation reduces the coefficient of friction and wear. A better effect can be obtained when nitrogen implantation is combined with carbon deposition. Based on the changes in the coefficients of friction and wear as well as profilograms of wear tracks, the improvement of the tribological properties was found at a depth exceeding nearly 5 times the range of the implanted nitrogen ions. Identification of the long-range effect for Ti6Al4V alloy was performed on the basis of tribological analyses. This study is a continuation of research conducted for AISI 316L and H11 steel.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 841-844
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of External Pressure on Resonant Frequency of SAW Resonator
Autorzy:
Jasek, K.
Pasternak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1189910.pdf
Data publikacji:
2015-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
02.60.-x
43.35.Pt
46.80.+j
61.30.Hn
Opis:
The results of numerical simulations and experimental measurements of surface acoustic wave resonator centre frequency and amplitude dependence on external pressure changes in the range 0-1 atm are presented in the paper. According to the analytical model as well as numerical calculations the pressure influence on the resonator centre frequency is linear. Unfortunately, in the real measurements the linearity is difficult to observe. Additional effects that modify the linear dependence of the centre frequency on pressure are caused by water particles. It is well visible especially in the low pressure range. The phenomenon can be applied for research of water contents in dry gases as well as construction of acoustoelectronic vacuometers.
Źródło:
Acta Physica Polonica A; 2015, 127, 6; 1601-1604
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Radiation Defect Centers in Neutron Irradiated Si Using Inverse Laplace Transformation to Analysis of Photocurrent Relaxation Waveforms
Autorzy:
Kamiński, P.
Kozłowski, R.
Żelazko, J.
Powiązania:
https://bibliotekanauki.pl/articles/1361219.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.-y
71.55.-i
61.80.-x
Opis:
High-resolution photoinduced transient spectroscopy has been applied to investigating the effect of the 1 MeV neutron fluence on the electronic properties of radiation defects in Czochralski grown silicon in magnetic field. A new approach to the analysis of the photocurrent relaxation waveforms as a function of time and temperature has been presented. It is based on using a two-dimensional numerical procedure with implementation of the inverse Laplace transformation for creating images of the sharp spectral fringes depicting the temperature dependences of the thermal emission rate for detected defect centers. In the material irradiated with the fluence of 3×$10^{14} cm^{-2}$, the dominant traps with activation energies of 75 meV and 545 meV are tentatively identified with an aggregate of three Si interstitials and the trivacancy, respectively. In the material irradiated with the fluence by the order of magnitude higher, the activation energies of the main traps are found to be 115, 350, 505, 545, and 590 meV. These traps are tentatively attributed to an aggregate of four Si interstitials, as well as to vacancy related centers such as $V_3$ (2-/-), $V_2O$ (-/0), $V_3$ (-/0) and $V_4$ (-/0), respectively.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 976-981
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Emitting Single-Crystalline Silicon Wafers Implanted with V and III Group Ions
Autorzy:
Komarov, F.
Vlasukova, L.
Milchanin, O.
Greben, M.
Parkhomenko, I.
Mudryi, A.
Wendler, E.
Zukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1198877.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.-x
61.72.Ff
63.20.-e
78.66.-w
Opis:
Compound semiconductor nanocrystals (InAs, InSb, GaSb) were successfully synthesized in single crystalline Si by high fluence ion implantation at 500C followed by high-temperature rapid thermal annealing or conventional furnace annealing at 900-1100°C. Rutherford backscattering spectrometry, transmission electron microscopy/transmission electron diffraction, Raman scattering, and photoluminescence were employed to characterize the implanted layers. Two different types of the broad band emission extending over 0.75-1.1 eV were observed in photoluminescence spectra of annealed samples. One of the bands disappears in photoluminescence spectra of samples annealed at 1100C unlike the other one.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1288-1291
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time Decay of Stable Absorption of Gamma Irradiated LNO, LNO:Cu and YAP:Ce Crystals
Autorzy:
Potera, P.
Powiązania:
https://bibliotekanauki.pl/articles/1205403.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.-x
78.40.-q
61.72.jn
Opis:
The present work is devoted to investigation of stability of stable color centers that are induced by gamma radiation in pure $LiNbO_{3}$, Cu-doped $LiNbO_{3}$ and Ce-doped $YAlO_{3}$ single crystals
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 774-776
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Color Centers in $Ca_4GdO(BO_3)_3$ Single Crystals Irradiated by Gamma Quanta
Autorzy:
Potera, P.
Lukasiewicz, T.
Piecuch, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400491.pdf
Data publikacji:
2013-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.40.Fy
78.40.Ha
61.80.-x
78.20.-e
Opis:
The present work is devoted to investigation of optical absorption in pure $Ca_4GdO(BO_3)_3$ single crystals in the spectral range 0.2-1.1 μm induced under influence of the gamma quanta irradiation with absorbed dose $2 \times 10^3$ Gy. The effect of heating in air on the absorption spectrum of irradiated sample is also studied.
Źródło:
Acta Physica Polonica A; 2013, 124, 1; 122-124
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of High Energy Electron Irradiation on Structure and Optical Properties of ZnO Films
Autorzy:
Myroniuk, D.
Lashkarev, G.
Shtepliuk, I.
Lazorenko, V.
Maslyuk, V.
Timofeeva, I.
Romaniuk, A.
Strelchuk, V.
Kolomys, O.
Khomyak, V.
Powiązania:
https://bibliotekanauki.pl/articles/1399153.pdf
Data publikacji:
2013-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.80.-x
78.55.Et
71.55.Gs
Opis:
Zinc oxide films were grown on sapphire substrates by direct current magnetron sputtering and irradiated by electrons with energy 10 MeV and fluences $10^{16}$ and $2 \times 10^{16} cm^{-2}$. As-grown and irradiated samples were investigated by X-ray diffraction and photoluminescence spectroscopy. It was found that radiation causes the appearance of complex defects, reducing the size of coherent scattering regions and the increase of the defect PL band.
Źródło:
Acta Physica Polonica A; 2013, 124, 5; 891-894
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Multilayered $Ti-Hf-Si-N//NbN//Al_2O_3$ Coatings with High Physical and Mechanical Properties
Autorzy:
Pogrebnjak, A.
Prozorova, M.
Kovalyova, M.
Kolisnichenko, O.
Beresnev, V.
Oyoshi, K.
Takeda, Y.
Kaverina, A.
Shypylenko, A.
Partyka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1400428.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
41.75.-i
61.80.-x
81.15.-z
Opis:
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 - $2.571 \times 10^{-5}$. 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).
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 813-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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