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  1. 160 Acta Physica Polonica A

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  1. 9 2018

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  3. 29 2016

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  1. 8 Babilas R.

  2. 6 Dynowska E.

  3. 5 Michalik S.

  4. 4 Bayrak G.

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1
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Structural Characterization of Some Table Salt Samples by XRD, ICP, FTIR and XRF Techniques

100%
Yalçin Ş., Mutlu İ.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
50-52
EN
In this study, we have investigated structure and impurities of six different salts which have a great importance in our everyday life, namely source salt, Himalayan salt, rock salt, sea salt, lake salt and reduced sodium salt (minsalt) by means of different analytical methods, namely X-ray powder diffraction, scanning electron microscope-energy dispersive X-ray spectroscopy, inductive coupling plasma optic emission spectroscopy, X-ray fluorescence spectrometer and the Fourier transform infrared spectroscopy. With the light of obtained results, suitability and performance of the different analytical methods were discussed in some details.
2
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Effect of Cu Negative Ion Implantation on Physical Properties of Zn_{1-x}Mn_xTe Films

63%
Pogrebnjak A., Shypylenko A., Amekura H., Takeda Y., Opanasyuk A., Kurbatov D., Kolotova I., Klymov O., Kozak C.
Acta Physica Polonica A
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2013
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vol. 123
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issue 5
939-942
EN
The paper deals with the investigations of structural properties of Zn_{1-x}Mn_xTe films, which were fabricated under various deposition conditions using the thermal evaporation method in a closed volume. The surface morphology of the samples was studied, the phase analysis of their structures was performed, the elemental analysis of the films and the crystal lattice constant were investigated. The texture perfection of the films before and after copper ion implantation was evaluated.
3
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The Structural Stability of Soft Magnetic Fe-Co-Zr-W-B Metallic Glasses Investigated by the in-situ X-ray Diffraction

63%
Michalik S., Bednarcik J., Pawlik P., Matija R., Sovak P.
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vol. 126
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issue 1
66-67
EN
The atomic structure of as-prepared Fe_{61}Co_{(14-x)}Zr_{5}W_{x}B_{20} (x=1, 2 and 4) ribbon samples and their thermal stability were investigated by in-situ high-energy X-ray diffraction experiments. It was observed that higher W concentration causes the tiny shift of the main peak of the reduced atomic pair distribution function to higher values of interatomic distances and increases the coefficient of volume thermal expansion. The crystallization process occurs in two steps and is qualitatively the same for all studied specimens. Firstly the Fe_{23}B_{6} phase is created and later is transformed to other types of borides together with the creation of a Fe-based phase.
4
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The Quantitative Dependence of Reducibility on Mineralogical Composition in Iron Ore Sinters (Blast Furnace Sinters)

63%
Krztoń H., Stecko J., Kania Z.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
1147-1150
EN
Reducibility is a parameter which describes the ability of oxygen, combined with iron, to be removed from iron ore sinters by a reducing gas used in a blast furnace, and is often characterized by a Fe²⁺ content in a sinter. In sinters, iron at Fe²⁺ valence can occur in various types of minerals, which differ in values of reducibility. The set of sinters with the reducibility from 0.63%/min to 1.49%/min, prepared in the different laboratory conditions, were examined in terms of their mineral composition. The quantitative dependences between the fractions of the individual mineral constituents of the sinters and the values of reducibility were sought. The increase of the reducibility was correlated with a decrease of the content of magnetite and a rise of the fraction of hematite.
5
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On the Crystal and Magnetic Behavior οf ScFe_{4}Al_{8} Single Crystal

63%
Rećko K., Dobrzyński L., Lemée-Cailleau M., Waliszewski J., Talik E., Suski W., Courtois P.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
206-208
EN
Nuclear and magnetic properties of the ScFe_{4}Al_{8} single crystal were found to exhibit unparalleled complexity of nuclear and magnetic structures. Our previous neutron measurements revealed presence of two modulation vectors, both along [ε, ε, 0], however with different critical temperatures. Recent experiments forced us to revise our knowledge of the structural ordering in the sample. So far, the crystal structure of this alloy, being of ThMn_{12}-type, has never been questioned.
6
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Growth and Characterization of Wide-Gap Cd_{1-x}Zn_{x}Se Ternary Alloys by Using Electron Beam Evaporation Technique

63%
Suthagar J., Rajesh S., Perumal K., Balasubramaniam T., Suthan Kissinger N.
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issue 3
506-511
EN
Cd_{1-x}Zn_{x}Se films with different zinc content were deposited by electron beam evaporation technique onto glass substrates for the application of solid-state photovoltaic devices. The structural, surface morphological and optical properties of Cd_{1-x}Zn_{x}Se films have been studied in the present work. The host material, Cd_{1-x}Zn_{x}Se, has been prepared by the physical vapor deposition method of electron beam evaporation technique under the pressure of 1 × 10^{-5} mbar. The X-ray diffractogram indicates that these alloy films are polycrystalline in nature, of hexagonal structure with strong preferential orientation of the crystallites along (002) direction. Linear variation of lattice constant with composition (x) is observed. Surface roughness measured by atomic force microscopy is used to estimate the interface roughness. The optical properties show that the band gap (E_{g}) values vary from 2.08 to 2.64 eV as zinc content varies from 0.2 to 0.8. The surface morphological studies show the very small, fine and hardly distinguishable grains smeared all over the surface. The material properties would be altered and excellently controlled by adiusting the system composition x.
7
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Crystal Perfection Studies of Single Crystal Superalloy Turbine Blades by X-Ray Diffraction Methods

63%
Gancarczyk K., Albrecht R., Bogdanowicz W., Sieniawski J.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
1088-1090
EN
In the paper the crystal structure of single crystal CMSX-4 blade casts, applied in high pressure turbine of aircraft engines was analyzed. The longitudinal section of blade, cast at withdrawal rate of 3 mm/min was used as a sample. During the conducted research, following X-ray diffraction methods were applied: EFG Ω-scan, Auleytner X-ray topography and analysis of diffraction reflex profile ("rocking curve"). The authors determined crystal orientation in entire blade casts on the basis of set criterion concerning values of angle α - deviation of [001] direction from the direction of cast withdrawal. Conclusions concerning the crystal structure quality of the blade were drawn based on results from three different research methods. Local changes in crystal orientation on the surface of blade cast, also areas with significant structure defect degree and the presence of internal stresses were characterized.
8
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Study of Ultrasonically Sprayed ZnO Films: Thermal Annealing Effect

63%
Ozutok F., Demirselcuk B., Sarica E., Turkyilmaz S., Bilgin V.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
53-55
EN
ZnO thin films were deposited on microscope glass substrates by ultrasonic spray pyrolysis technique. The effects of annealing under various temperatures on the optical and structural properties of ZnO thin films were analyzed. The as-deposited and annealed ZnO thin films were investigated by UV/VIS spectrophotometer and X-ray diffractometer. Some of the optical properties of the films such as transmittance, absorbance and band gap energy were investigated by UV/VIS spectrophotometer. The crystallinity levels of the films were investigated, the structural parameters such as diffraction angle, full-width at half maximum, lattice parameters, grain size and dislocation density were calculated and structural properties were analyzed. X-ray diffraction patterns indicated that the ZnO films had a polycrystalline hexagonal wurtzite structure.
9
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Isobaric Thermal Expansion and Isothermal Compression of Powdered NiFe Based Alloys Studied by In-Situ EDXRD

63%
Olekšáková D., Füzer J., Kollár P., Bednarčík J., Lathe C.
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vol. 126
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issue 1
128-129
EN
The aim of the present work was to study the isothermal compression and isobaric thermal expansion behaviour of ball-milled NiFe (81 wt.% of Ni) and NiFeMo (79 wt.% of Ni, 16 wt.% of Fe) alloy and follow its phase evolution when exposed to high pressure and temperature. In-situ pressure-temperature energy dispersive X-ray (EDXRD) diffraction experiments were performed at the MAX80 instrument (beamline F2.1). The compressibility of NiFe alloy at 400 °C was evaluated for pressure values of up to 3.5 GPa. The EDXRD spectra revealed the presence of cubic FeNi_{3} phase as determined from the shift of (111), (200) and (220) reflection lines in corresponding EDXRD spectra.
10
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Thin Layers XRD Study Technique on an Example of Cobalt Tetrafluoro Phthalocyanine

63%
Sukhikh A., Basova T., Gromilov S.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
889-891
EN
Thin layers X-ray diffraction study technique utilizing single-crystal X-ray diffractometer equipped with microfocus X-ray tube is described. It is shown that the layers of the tetra-fluorinated cobalt phthalocyanine (CoPcF₄), deposited by thermal evaporation in vacuum on a polished surface of the substrate (glass, quartz), have a highly oriented polycrystalline structure. All the crystallites have the (00l) plane oriented along the surface of the substrate. CoPcF₄ X-ray diffraction pattern indexing was conducted and unit cell parameters were determined. It is shown that crystal phase of both polycrystalline powder and thin layers of CoPcF₄ are isostructural to that of α -CoPc.
11
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Specific Heat Study of PrNi_4Si

63%
Procházková K., Daniš S., Svoboda P.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
299-302
EN
Here we present the results of pilot polycrystalline study of PrNi_4Si. The X-ray study did not confirm the expected CaCu_5-type structure. Instead of this, the orthorhombic structure with the space group Cmmm was found. The zero-field specific heat was measured in the temperature range 2-300 K. The data were analyzed using the sum of the phonon, electronic, and magnetic contributions to specific heat, respectively. The magnetic part of the specific heat can be well described using the Schottky formula for the 9 crystal-field singlet levels of the pz3 H4 ground-state multiplet of the Pr^{3+} ion.
12
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Isostructural Transition in RTAl Compounds at High Temperatures

63%
Prchal J., Javorský P., de Boer F., Moleman A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
335-338
EN
Based on previously discovered forbidden values of the c/a ratio, we studied anomalies in the temperature evolution of the lattice parameters (a, c) of several hexagonal RTAl compounds at high temperatures (above room temperature). The compound ErNi_{0.45}Cu_{0.55}Al, that seemed to be impossible to be prepared in single-phase form, reaches the single-phase state at temperatures above 493 K (220°C). On the other hand, the compound TbNi_{0.7}Cu_{0.3}Al - that was expected to undergo a first-order structural phase transition at high temperatures - exhibits a second-order type transition when approaching the critical values of the c/a ratio. These results are in agreement with idea of a forbidden range of c/a values in these compounds.
13
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Synthesis and Structure Characterisation of Micro-and Nanocrystalline Powders of Dy_{1-x}R_xFeO₃ (R = La, Pr, Nd, Sm, Gd)

63%
Pavlovska O., Lutsyuk I., Kondyr A., Zhydachevskyy Y., Vakhula Y., Pieniążek A., Vasylechko L.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
802-805
EN
This work deals with the study of the phase and crystal structure behaviour of new micro- and nanocrystalline ferrites Dy_{1-x}R_xFeO₃ obtained by solid state reactions (R = La, Pr) and sol-gel citrate (R = Nd, Sm, Gd) techniques. It was established that all synthesized samples adopt orthorhombic perovskite structure isotypic with GdFeO₃. Unit cell dimensions and atomic coordinates of the mixed rare earth ferrites derived by full profile Rietveld refinement technique agree well with the data of the "pure" DyFeO₃ and RFeO₃ compounds, thus proving formation of continuous solid solutions Dy_{1-x}R_xFeO₃ in the DyFeO₃-RFeO₃ systems (R = La, Pr, Nd, Sm, Gd). Peculiarity of the Dy_{1-x}La_xFeO₃ series is the lattice parameters crossover and formation of dimensionally tetragonal structure at x ≈0.97.
14
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The Law of Growth of Nitrided Layer in 31CrMoV9 Steel

63%
Syla N., Aliaj F., Dalipi B.
Acta Physica Polonica A
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2016
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vol. 130
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issue 1
83-86
EN
The law of growth of nitrided layers produced by gaseous nitriding of 31CrMoV9 alloy steel at different process parameters is described. 31CrMoV9 steel specimens were subjected to nitriding process in ammonia gas at three different temperatures: 510, 550 and 590°C, and for each temperature four different nitriding times were used. This way twelve specimens were produced. Nitrided specimens were investigated with optical microscopy, electron probe micro-analysis and x-ray diffraction. The nitrogen depth concentration profiles, deduced from electron probe micro-analysis, in conjunction with results of optical microscopy, were used to determine the thickness of the nitrided layers, i.e. the diffusion depth of nitrogen. From the dependence of the nitrided layer thickness on process parameters (temperature and time) it was possible to deduce the law that governs the growth of the nitrided layer for 31CrMoV9 alloy steel. Through this law, then, it is possible to predetermine the layer thickness for every real process parameter in nitriding of 31CrMoV9 steel, which is very important for technological applications.
15
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Angular Distribution of N-Doped Carbon Nanotubes in Alumina Membrane Channels: A High-Energy X-ray Diffraction Study

63%
Hawelek L., Brodka A., Dore J., Honkimäki V., Kyotani T., Yang Q., Burian A.
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issue 2
302-306
EN
An alignment study of multi-wall N-doped carbon nanotubes prepared by a template pyrolytic carbon deposition method inside channels of an alumina membrane has been performed using high-energy X-ray diffraction on the ID15B beamline at the European Synchrotron Radiation Facility (ESRF, Grenoble). The two-dimensional diffraction pattern of the deposited carbon nanotubes, recorded directly, within the alumina membrane, using an image plate detector, exhibits two non-continuous arcs corresponding to the 002 graphitic reflection. The following values of the angle between the axis of the carbon nanotubes lying along the membrane channels and the incident beam were taken for five positions: 0°, 30°, 45°, 60° and 90°. The anisotropic scattering distribution of the two-dimensional patterns indicates an orientational alignment of the nanotubes. The one-dimensional intensity patterns obtained by scanning around the circumference of the (0 0 2) ring have allowed an estimation of the angular distribution of the nanotubes axes.
16
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Wear Properties of Gabbro Based Glass and Glass-Ceramic Materials

51%
Bayrak G.
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vol. 125
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issue 2
615-617
EN
Glass-ceramic materials were developed from gabbro including MgO and Al_2O_3 additives. Heat treatments for phase transformation from glassy matrix to glass-ceramic were carried out at 1000C for 3 h. X-ray diffraction studies conducted on the glass-ceramic samples revealed that the phases formed in the glass-ceramics were cordierite, anorthite, diopsitic augite, forsterite and andesine. Glass and glass-ceramic materials were tested for wear properties against a harder alumina counterface using by a ball-on-disc tribometer at dry sliding condition. Wear tests were realized under the loads of 2.5, 5, and 7.5 N and at the sliding speeds of 0.1, 0.2, and 0.3 m/s. Wear rate of the glass and glass-ceramics ranged from 7.324 × 10^{-7} and 2.150 × 10^{-3}-9.971 × 10^{-7} and 4.982 × 10^{-5} mm^3/m, respectively. It was shown that the crystallization treatment caused the decrease of wear rate.
17
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Preparation and Characterization of Magnetic Nanoparticles

51%
Khmara I., Kubovcikova M., Koneracka M., Kalska-Szostko B., Zavisova V., Antal I., Rajnak M., Dankova Z., Kavecansky V., Omastova M., Kopcansky P.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
704-706
EN
The magnetic nanoparticles with core diameter 10 nm were modified by poly-L-lysine to bind antibody for cancer cell detection. Prepared biocompatible magnetic fluid (MFPLL) was characterized by dynamic light scattering method to obtain the particle size distribution. The microstructure of the MNPs and MFPLL samples were studied by transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy. Magnetic properties of the samples were measured by SQUID magnetometer and superparamagnetic behaviour of the samples was confirmed.
18
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Selected Properties of ZnO Coating on Mg-Based Alloy for Biomedical Application

51%
Kania A., Pilarczyk W., Babilas R.
Acta Physica Polonica A
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2018
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vol. 133
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issue 2
222-224
EN
Magnesium and its alloys are interesting materials for biodegradable implant applications. Magnesium alloys have very good strength properties, they are lightweight, but their main disadvantage is a low corrosion resistance in the physiological environment. Various modifications of a Mg alloys surface by deposition of different coatings are used to prevent untimely dissolution. The article presents the investigation results of a thin ZnO coating deposited on a MgCa2Zn1Gd3 alloy by means of the magnetron sputtering method. The studies include: scanning electron microscope observation of the ZnO surface, X-ray phase analysis, surface roughness measurement in atomic force microscopy, the microhardness test and potentiodynamic corrosion resistance test in the Ringer solution at 37°C. It was found that the ZnO coating is compact and continuous. It increases the hardness of the MgCa2Zn1Gd3 alloy and also improves its corrosion resistance. The corrosion potential is shifted slightly towards the positive values from -1.52 V to -1.50 V for the alloy with the ZnO coating.
19
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The Effect of Carbon Coating on the Electrochemical Performance of Nanosized Li_2FeSiO_4 Cathode Materials

51%
Wang Y., Su D., Wang G.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
279-282
EN
Carbon-coated Li_2FeSiO_4/C cathode materials have been synthesized through a modified ball-milling process. The physical characterizations of Li_2FeSiO_4 were conducted by using X-ray powder diffraction, field-emission scanning electron microscopy and transmission electron microscopy techniques. Field-emission scanning electron microscopy and transmission electron microscopy images revealed that Li_2FeSiO_4/C consists of nanosized particles coated with an amorphous carbon layer. The electrochemical performances of Li_2FeSiO_4/C cathode materials were evaluated through fully assembled lithium batteries via cyclic voltammetry, charge/discharge test and electrochemical impedance spectroscopy. The Li_2FeSiO_4/C cathode materials showed a much improved electrochemical performance in terms of higher specific capacity, better cycling performance and less charge transfer resistance than that of the pristine Li_2FeSiO_4.
20
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Mössbauer Spectroscopy Studies of Multiferroic (BiFeO_3)_{1 - x}-(BaTiO_3)_{x} Solid Solutions Prepared by Mechanical Activation

51%
Jartych E., Malesa B., Antolak-Dudka A., Oleszak D.
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vol. 125
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issue 3
837-839
EN
X-ray diffraction and ^{57}Fe Mössbauer spectroscopy were applied as complementary methods in order to investigate the structure and hyperfine interactions of (BiFeO_3)_{1-x}-(BaTiO_3)_{x} solid solutions prepared by mechanical activation and subsequent heat treatment.
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