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Wyświetlanie 1-15 z 87
Tytuł:
Light Emission Properties of GaN-Based Laser Diode Structures
Autorzy:
Godlewski, M.
Phillips, M. R.
Czernecki, R.
Targowski, G.
Perlin, P.
Leszczyński, M.
Figge, S.
Hommel, D.
Powiązania:
https://bibliotekanauki.pl/articles/2043715.pdf
Data publikacji:
2005-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.-z
78.60.Hk
68.37.Hk
Opis:
Cathodoluminescence is applied for evaluation of in-depth and in-plane variations of light emission from two types of GaN-based laser diode structures. We evaluate in-depth properties of the laser diode emission and demonstrate that potential fluctuations still affect emission of laser diodes for e-beam currents above thresholds for a stimulated emission.
Źródło:
Acta Physica Polonica A; 2005, 108, 4; 675-680
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Preparation of Core-Shell $Al_2O_3//Cu$ Composite Powders by Electroless Plating in the Alkaline Solution
Autorzy:
Uysal, M.
Karslioğlu, R.
Alp, A.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1399707.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
Opis:
In this study, Cu-coated $Al_2O_3$ composite powders were synthesized by using electroless plating method. The influence of the plating bath composition and ceramic powder concentration on the Cu plating was characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction techniques. The results showed that the electroless bath composition plays an important role for the structure of nano core-shell $Al_2O_3//Cu$ composite powders. The content of copper in the composite powders could be effectively controlled by adjusting the content of copper sulfate and formaldehyde in the plating solution. Furthermore, the pretreatment of the $Al_2O_3$ powders is also a key factor to form a uniform shell copper layer coating on $Al_2O_3$ particles.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 238-240
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship between Sample Morphology and Carrier Diffusion Length in GaN Thin Films
Autorzy:
Godlewski, M.
Goldys, E. M.
Phillips, M.
Böttcher, T.
Figge, S.
Hommel, D.
Czernecki, R.
Prystawko, P.
Leszczynski, M.
Perlin, P.
Wisniewski, P.
Suski, T.
Bockowski, M.
Grzegory, I.
Porowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2035593.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.Mm
68.37.Hk
78.60.Hk
Opis:
Scanning and spot-mode cathodoluminescence investigations of homo- and hetero-epitaxial GaN films indicate a surprisingly small influence of their microstructure on overall intensity of a light emission. This we explain by a correlation between structural quality of these films and diffusion length of free carriers and excitons. Diffusion length increases with improving structural quality of the samples, which, in turn, enhances the rate of nonradiative recombination on structural defects, such as dislocations.
Źródło:
Acta Physica Polonica A; 2002, 102, 4-5; 627-632
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Measurements at Liquid Helium Temperature of Poly- and Monocrystalline ZnO Films
Autorzy:
Witkowski, B.
Wachnicki, Ł.
Jakieła, R.
Guziewicz, E.
Godlewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1492546.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
77.55.hf
68.37.Hk
61.72.Ff
Opis:
Scanning electron microscopy, cathodoluminescence and secondary ion mass spectroscopy investigations are used to study an inter-link between structural quality, elements distribution and light emission properties of ZnO poly- and monocrystalline films grown by the atomic layer deposition. Cathodoluminescence and scanning electron microscopy investigations were performed at liquid helium temperature for four different types of ZnO films deposited on different substrates.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-028-A-030
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Secondary Electroluminescence on Cathodoluminescence and Other Luminescence Measurements
Autorzy:
Pluska, M.
Czerwinski, A.
Szerling, A.
Ratajczak, J.
Kątcki, J.
Powiązania:
https://bibliotekanauki.pl/articles/1198425.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Hk
85.30.De
61.72.-y
68.37.Hk
Opis:
Cathodoluminescence and photoluminescence measurements are commonly accepted as revealing local properties of a specimen region excited by a beam of electrons or photons. However, in the presence of a strong electric field (e.g. a junction) an electron (or light/laser) beam-induced current is generated, which spreads over the structure. A secondary non-local electroluminescence, generated by this current and detected together with the expected luminescence signal, may strongly distort measurement results. This was confirmed by cathodoluminescence measurements on test structures prepared by focused ion beam on AlGaAs/GaAs/InGaAs laser heterostructures. Methods for minimizing the distortion of measured luminescence signals are presented.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1027-1032
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cathodoluminescence Profiling of InGaN-Based Quantum Well Structures and Laser Diodes - In-Plane Instabilities of Light Emission
Autorzy:
Godlewski, M.
Ivanov, V. Yu.
Goldys, E. M.
Phillips, M.
Böttcher, T.
Figge, S.
Hommel, D.
Czernecki, R.
Prystawko, P.
Leszczynski, M.
Perlin, P.
Grzegory, I.
Porowski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2036870.pdf
Data publikacji:
2003-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Ff
61.72.Mm
68.37.Hk
78.60.Hk
Opis:
Instabilities of light emission and also of stimulated emission in series of GaN epilayers and InGaN quantum well structures, including laser diode structures, are studied. A stimulated emission is observed under electron beam pumping. This enabled us to study light emission properties from laser structures and their relation to microstructure details. We demonstrate large in-plane fluctuations of light emission and that these fluctuations are also present for excitation densities larger than the threshold densities for the stimulated emission.
Źródło:
Acta Physica Polonica A; 2003, 103, 6; 689-694
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Crystallization Process of Eu$\text{}^{3+}$:CaSiO$\text{}_{3}$ Gel Using Optical and Thermal Methods
Autorzy:
Andrić, Ž.
Krsmanović, R.
Marinović-Cincović, M.
Dramićanin, T.
Šećerov, B.
Dramićanin, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/2047860.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
61.46.Hk
68.37.Hk
78.67.Bf
81.70.Pg
Opis:
Alkoxy sol-gel technique is an important preparation method for production of rare-earth based phosphors. Crystallization of gel provides a way to prepare phosphors on lower working temperatures than those required for the solid state reactions. CaSiO$\text{}_{3}$ gel samples were obtained through hydrolysis-condensation reactions of tetraethylorthosilicate as silica source. In this work we studied the process of crystallization of Eu$\text{}^{3+}$-activated CaSiO$\text{}_{3}$ gel and decomposition of organic precursors by means of thermal analysis and infrared spectroscopy. Results of scanning electron microscopy and energy-dispersion spectrometry are used to check chemical composition and morphology of synthesized material. Emission spectra and emission lifetime measurements are performed to investigate luminescence properties of Eu$\text{}^{3+}$ doped CaSiO$\text{}_{3}$ powder.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 969-974
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Thermal Investigation of Sol-Gel Derived Eu$\text{}^{3+}$:Y$\text{}_{2}$SiO$\text{}_{5}$ Nanoparticles
Autorzy:
Krsmanović, R.
Andrić, Ž.
Marinović-Cincović, M.
Zeković, I.
Dramićanin, M. D.
Powiązania:
https://bibliotekanauki.pl/articles/2047861.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
61.46.Hk
68.37.Hk
78.67.Bf
81.70.Pg
Opis:
Investigation done on Y$\text{}_{2}$SiO$\text{}_{5}$ nanoparticles doped with Eu$\text{}^{3+}$ ions obtained with the alkoxy sol-gel route is presented in this paper. We investigate the optical and thermal properties of obtained material during the conversion of the gel into nanocrystalline form. Fourier transform infrared spectroscopy and fluorescence spectroscopy of Eu$\text{}^{3+}$ ions are used for the optical characterizations, while thermal analysis is done with thermogravimetric-differential thermal analysis technique. Material exhibits characteristic luminescence emission of the trivalent europium ion.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 975-980
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Two-Step Oxidation on Performance of Micro-Arc Oxidation on 6063 Aluminum Alloy
Autorzy:
Ayday, A.
Powiązania:
https://bibliotekanauki.pl/articles/1032524.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Mq
68.37.Hk
Opis:
This paper investigates the effect of different electrolytes containing silicate and phosphate by two-step oxidation using the micro-arc oxidation technique. The growth effect, surface roughness, and element distributions of the micro-arc oxidation coatings were characterized. The composition of coating was characterized using X-ray diffraction and energy dispersive spectrum, and the morphology was examined using scanning electron microscope. The surface characterizations results show that the coating growth forms are different in Si and P electrolytes while the coated samples were almost composed of γ-Al₂O₃.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 96-98
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Substrate Temperature on the Structural and Optical Properties of Nanocrystalline Cadmium Selenide Thin Films Prepared by Electron Beam Evaporation Technique
Autorzy:
Suthan Kissinger, N.
Suthagar, J.
Saravana Kumar, B.
Balasubramaniam, T.
Perumal, K.
Powiązania:
https://bibliotekanauki.pl/articles/1535702.pdf
Data publikacji:
2010-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
81.05.Dz
Opis:
Cadmium selenide (CdSe) thin films on glass substrates were prepared by physical vapour deposition under vacuum using the electron beam evaporated technique for different substrate temperatures: room temperature, 100, 200, 300°C, respectively. X-ray diffraction analysis indicates that the films are polycrystalline, having hexagonal (wurtzite) structure irrespective of their substrate temperature. All the films show most preferred orientation along (0 0 2) plane parallel to the substrates. The microstructural parameters such as particle size, stress, strain and dislocation density were calculated. The grain size of deposited CdSe films is small and is within the range of 18 to 42 nm. The optical absorption spectra of electrom beam deposited CdSe films were studied in the wavelength region of 250-2500 nm. The energy gap $(E_{g})$ values (allowed direct transitions), calculated from the absorption spectra, ranged between 1.77 and 1.92 eV. The surface morphological quality of electron beam evaporated CdSe films were analyzed by scanning electron microscopy and atomic force microscopy.
Źródło:
Acta Physica Polonica A; 2010, 118, 4; 623-628
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition and Microstructure of Surface Layers Produced by Ion Beam Assisted Deposition of Metals from a Pulsed Arc-Discharge Plasma onto Aluminum Substrates
Autorzy:
Poplavsky, V.
Komarov, F.
Luhin, V.
Pil'ko, V.
Partyka, J.
Powiązania:
https://bibliotekanauki.pl/articles/1402241.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
68.55.Nq
Opis:
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.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 946-948
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Martensite reorientation after thermal cycling in NiTiCu shape memory alloys studied by EBSD technique
Autorzy:
Rak, J.
Goryczka, T.
Ochin, P.
Powiązania:
https://bibliotekanauki.pl/articles/1153063.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.fg
68.37.Hk
Opis:
The Ni₂₅Ti₅₀Cu₂₅ shape memory alloy exhibits one-step martensitic transformation. Transformation occurs between the B2 parent phase and the B19 orthorhombic martensite. The course of the martensitic transformation was in situ studied in the alloy with use of electron backscatter diffraction. During heating, reverse martensitic transformation occurs from the B19 orthorhombic martensite to the B2 parent phase. On cooling, from the parent phase the B19 martensite is formed. Obtained results proved that the B19 martensitic plates forms the variants indexed as 1, 3, and 5. Thermal cycling does not change the crystallographic correlation between the parent phase and the martensite. However, after cycling, different rearrangement of the martensitic plates can be received. In consequence, characteristic temperatures of the martensitic transformation are shifted.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 1075-1078
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaching Effect on Multiple Surfaces of a Single Grain Decagonal Al-Ni-Co Quasicrystal
Autorzy:
Lowe, M.
Gille, P.
McGrath, R.
Sharma, H.
Powiązania:
https://bibliotekanauki.pl/articles/1373238.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
68.37.Hk
Opis:
We have studied the effect of leaching treatments on the surface microstructure and chemical composition on the two different twofold surfaces, (10000) and (101̅00), and the tenfold surface (00001) of a decagonal (d-) Al-Ni-Co quasicrystal. A sample exposing the three surfaces was leached with NaOH solution and then studied using atomic force microscopy and scanning electron microscopy combined with energy dispersive X-ray analysis. The leaching treatment preferentially removes the Al present in the crystal surface leaving a mixture of transition metal and their associated oxides. The high symmetry, tenfold axis was found to be less resistant to leaching than either of the twofold axes, providing further information regarding the effect of crystallographic direction on leaching kinetic.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 520-523
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Functional Materials Based on Nano- and Micro-Objects with Developed Surface
Autorzy:
Dorogov, M.
Dovzhenko, O.
Gryzunova, N.
Vikarchuk, A.
Romanov, A.
Powiązania:
https://bibliotekanauki.pl/articles/1402063.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
68.37.Hk
Opis:
The paper describes the materials with a developed surface fabricated on the basis of electrodeposited copper icosahedral small particles and coatings made of such particles. Increasing the specific surface area of the electrolytic metal is achieved by special heat and/or chemical treatments. Changes in the structure and morphology of icosahedral small particles are analyzed with scanning electron microscopy and X-ray diffraction. The specific surface area of the material is determined with low-temperature gas adsorption technique. Annealing of icosahedral small particles and coatings leads to the formation of the porous structure and a "forest" of whiskers on their surface. Chemical etching of icosahedral small particles corrodes the inside material and provides the formation of hollow particles. Possible applications for obtained materials with a developed surface are offered.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 503-505
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Properties of Soft-Magnetic Amorphous Bilayer Ribbons
Autorzy:
Švec, P.
Mat'ko, I.
Marcin, J.
Kováč, J.
Vlasák, G.
Janičkovič, D.
Škorvánek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1534100.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Hk
68.37.Lp
Opis:
Rapidly quenched bilayers consisting of Fe-Si-B and Co-Si-B layers have been prepared by planar flow casting from a single crucible with two nozzles. Temperature dependences of electrical resistivity, dilatation and magnetization have been investigated in the amorphous state and during crystallization of both layers. Preliminary studies of the structure of the layers and of the interlayer have been performed by X-ray diffraction, cross-sectional electron microscopy and microanalysis. From the results it seems evident that the process of connection of the two layers during preparation takes place by solidification with only a small extent of mutual interdiffusion of component atoms localized to a narrow well-defined interface, leading to mechanically solid connection between the two layers. The effect of combined presence of two different soft magnetic alloys on the overall magnetic properties is discussed with respect to potential applications of such materials.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 832-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 87

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