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Kinetics of Solid-State Synthesis of Quaternary Cu₂FeSnS₄ (Stannite) Nanocrystals for Solar Energy Applications

100%
Baláž P., Baláž M., Zorkovská A., Škorvánek I., Bujňáková Z., Trajić J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1153-1155
EN
In this study we demonstrate the use of elemental precursors (Cu, Fe, Sn, S) to obtain stannite forms by a solid-state one-pot mechanochemical synthesis. In the processing route, we report the kinetics of the synthesis. For the characterization of the unique nanostructures, X-ray diffraction, specific surface area measurements and SQUID magnetometry methods were applied. CFTS polymorphs with the tetragonal body-centered structure with the average crystallite size 18-19 nm were obtained. The weak ferromagnetic properties of the quaternary nanocrystals after maximum milling time were also documented.
2
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Far-Infrared Study of DX-Like Centers in Pb_{0.95}Mn_{0.05}Te(Ga)

100%
Stojanović D., Trajić J., Hadžić B., Romčević M., Ivanchik I., Khokhlov D., Romčević N.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
959-962
EN
We present far-infrared reflection spectra of Pb_{0.95}Mn_{0.05}Te single crystal doped with gallium between 10 and 300 K. The analysis of the far-infrared reflection spectra was made by a fitting procedure based on the model of coupled oscillators. Together with the strong plasmon-phonon coupling we obtain three local modes of gallium at about 122 cm^{-1}, 166 cm^{-1}, and 192 cm^{-1}. The position of these modes depends on impurity center charge, and their intensity depends on temperature.
3
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Ellipsometric Measurements of Plastically Deformed Copper

100%
Mirić M., Rudolf R., Anžel I., Hadžić B., Romčević M., Trajić J., Romčević N.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
715-717
EN
Chemically pure copper (99.99) prepared in the sample of square cross-section (10×10 mm^{2}) and length about 50 mm was extremely plastically deformed with the repeated application of equal channel angular pressing. Equal channel angular pressing was applied as an effective technique for producing bulk nanoscaled structures. It is well known that severe plastic deformation of metallic materials often leads to microstructure with ultrafine grains and cross-sections which remain about equal before and after deformation. Optical properties of the sample were studied using spectroscopic ellipsometry in UV-VIS range. The parameters of the sample like copper oxide and surface roughness overlayer were calculated using two-film model together with the Bruggeman effective medium approximation.
4
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Raman Spectroscopy of Multiphonon Emission Process in Ni-Doped PbTe

84%
Romčević N., Trajić J., Hadžić B., Romčević M., Stojanović D., Lazarević Z., Kuznetsova T., Khokhlov D., Rudolf R., Anžel I.
Acta Physica Polonica A
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2009
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vol. 116
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issue 1
91-92
EN
In this paper, we present room temperature unpolarized Raman scattering spectra of Ni doped PbTe single crystal sample. Crystal of PbTe(Ni) was grown by the Bridgman method. The Ni concentration in the sample used here was 1× 10^{19} at./cm^{3}. Well resolved peaks appear at about 126, 143, 181, 362 and 724 cm^{-1}. The modes at 126 and 143 cm^{-1}, which are also observed in other telluride compounds, originate from vibrations in TeO_2. We assume that the mode at about 181 cm^{-1} is connected to excitations of a local phonon mode in the vicinity of an impurity atom (donor Ni^{3+} state). Modes at about 362 cm^{-1} and 724 cm^{-1} are the second and fourth harmonic of a local phonon mode, registered here due to multiphonon emission.
5
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Optical and Magnetic Properties of PbTe(Ni)

84%
Romčević N., Trajić J., Romčević M., Stojanović D., Kuznetsova T., Khokhlov D., Dobrowolski W., Rudolf R., Anžel I.
Acta Physica Polonica A
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2009
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vol. 115
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issue 4
805-807
EN
Far-infrared and magnetic properties of Ni doped PbTe (Z_Ni = 1× 10^{19} at./cm^{3}) single crystal are investigated in a broad range of temperature and magnetic fields. Far-infrared reflection spectra were analyzed using a fitting procedure based on the modified plasmon-two phonon interaction model. Together with the strong plasmon-two longitudinal optical phonon coupling we obtained a local mode of Ni at about 180 cm^{-1}. This mode intensity depends on temperature. Magnetic measurements shows that PbTe alloys doped with Ni reveals weak ferromagnetic interaction between magnetic ions.
6
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Optical Properties of Plastically Deformed Copper

84%
Trajić J., Rudolf R., Anžel I., Romčević M., Lazarević N., Mirić M., Lazarević Z., Hadžić B., Romčević N.
Acta Physica Polonica A
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2010
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vol. 117
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issue 5
791-793
EN
Pure copper (99.99), prepared in the sample of square cross-section (10 × 10 mm^{2}) and length about 50 mm, was extremely plastically deformed with the repeated application of Equal Channel Angular Pressing (ECAP). ECAP was applied as an effective technique for producing bulk nano-scaled structures. Optical properties of the sample were investigated using Raman spectroscopy. Two types of lines: narrow (with width of ≈ 7 cm^{-1}) and wide ( ≈ 40 cm^{-1}) are registered. Existence of two types of lines indicates that in the specimen exists nano-sized crystal structures of both Cu and CuO related with three dimensional amorphous boundary spaces, which indicates that plastic deformation of the sample did not lead to total amorphisation of the specimen.
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