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Wyświetlanie 1-15 z 241
Tytuł:
Investigation of Morphology and Chemical Composition of Self-Organized Semiconductor Quantum Dots and Wires by X-Ray Scattering
Autorzy:
Holý, V.
Meduňa, M.
Stangl, J.
Roch, T.
Bauer, G.
Powiązania:
https://bibliotekanauki.pl/articles/2030767.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.10.Dp
Opis:
X-ray scattering methods suitable for the investigation of the morphology and chemical composition of self-organized quantum dots and quantum wires are reviewed. Their application is demonstrated in experimental examples showing that a combination of small angle X-ray scattering with high-resolution X-ray diffraction can reveal both the shape and the chemical composition of the self-organized objects.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 7-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Curved Surfaces in Disordered Carbons by High Energy X-ray Scattering
Autorzy:
Burian, A.
Szczygielska, A.
Kołoczek, J.
Dore, J.
Honkimaki, V.
Duber, S.
Powiązania:
https://bibliotekanauki.pl/articles/2030692.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
61.10.Eq
61.46.+w
Opis:
Disordered carbons prepared by slow pyrolysis of saccharose and anthracene and subsequent heat treatment at 1000ºC and 2300ºC have been studied by high energy X-ray diffraction. Computer simulations of the powder diffraction patterns of fullerenes, nanotubes and carbon models have been compared with the experimental data after conversion to real space via the Fourier transform. The presence of fullerene- and nanotube-like fragments with non-six membered rings in the investigated samples has been deduced by detailed analysis of the radial distribution functions of the saccharose- and anthracene-based carbons and related to resistance to graphitization of the saccharose-based carbons and to stability of the growing crystallites in the case of the anthracene-based carbons. The obtained results are compared to high resolution electron microscopy and Raman studies.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 751-759
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Misfit Dislocation Sources in GaAs Epitaxial Layers
Autorzy:
Wierzchowski, W.
Mazur, K.
Strupiński, Wł.
Wieteska, K.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1945232.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
The formation of misfit dislocation was studied in GaAs homoepitaxial layers on the substrates containing considerable amount of isoelectronic indium. The layers were grown with metal-oxide chemical vapour deposition and chemical vapour deposition methods including low temperature process with tertiarbutylarsine arsenic source. The critical conditions of misfit dislocation formation were exceeded up to 5×. The samples were examined before and after epitaxial process with a number of different X-ray topographic and diffractometric methods, including high resolution synchrotron white beam topography. The crystallographic identification of the defects was supported by the numerical simulation of topographic images. It was found that a number of threading dislocations, continuing in the epitaxial layer from those existing in the substrate, did not take part in the formation of misfit dislocations despite a suitable slip system. On the other hand, the formation of misfit dislocations from small imperfections of epitaxial deposit was proved in many cases. A reasonable good quality of the layers was confirmed by the resolution of individual defects and only small broadening of rocking curves.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 341-346
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application-of Quasi-Forbidden Reflections for Determination of Composition of Pseudobinary Semiconductors
Autorzy:
Bąk-Misiuk, J.
Paszkowicz, W.
Domagała, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929715.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Wg
Opis:
An application of X-ray quasi-forbidden reflection method of composition determination for A$\text{}^{II}$B$\text{}^{VI}$ pseudobinary compounds is discussed. Three typical cases of the intensity dependence on the composition, as well as the choice of the most suitable reflection are presented.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 681-684
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Topographic Investigation of Cellular Structure and its Relation to another Defects in Various Types of GaAs Single-Crystals
Autorzy:
Wierzchowski, W.
Mazur, K.
Powiązania:
https://bibliotekanauki.pl/articles/1929756.pdf
Data publikacji:
1993-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
The defect patterns in GaAs crystal grown using liquid encapsulated Czochralski and gradient freeze methods with various types of doping were characterized using complementary X-ray topographic methods. It was found that the cellular structure occurring in the low doped crystal is developed independently from the actual growth surface. The occurrence of the cellular structure is connected with significant lattice deformation, and some results point that significant stress can influence its formation. The high doping prevents formation of the cellular structure, but at higher doping the phenomenon of "cellular growth" can occur due to instabilities of the growth surface. The present results point that defect pattern in GaAs crystals is more affected by the type of doping than by the choice of the growth method.
Źródło:
Acta Physica Polonica A; 1993, 84, 4; 789-794
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Temperature X-ray Diffraction Studies of Lattice Dynamics in Ni$\text{}_{3}$(Fe,Nb) Ordered Alloys
Autorzy:
Mekhrabov, A. O.
Powiązania:
https://bibliotekanauki.pl/articles/1930628.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
A study is performed on characteristics of lattice dynamics in the initially ordered ternary Ni$\text{}_{3}$(Fe$\text{}_{1-x}$Nb$\text{}_{x}$) (x = O to 10 at.%) alloys using high temperature X-ray diffractometry for the temperature range from 300 K to 1300 K. Aspects investigated included temperature and concentration dependencies of the full mean square atomic displacements Ū²$\text{}_{f}$, the Debye characteristic temperature Θ$\text{}_{D}$, and linear thermal expansion coefficient α. It is found that the Ū²$\text{}_{f}$, Θ$\text{}_{D}$, and α parameters show anomalous change at temperatures where the alloys are subjected to order-disorder phase transitions. It is further found that Nb addition results in the considerable increase in the parameters Ū²$\text{}_{f}$ and α and decrease in Θ$\text{}_{D}$. Moreover, the addition of Nb stabilizes Ni$\text{}_{3}$Fe ordered structure and shifts the order-disorder transition to higher temperature.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 571-578
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Composition Determination of Some A$\text{}^{II}$B$\text{}^{VI}$ Ternary Semiconductors from Quasi-Forbidden Reflection Intensity
Autorzy:
Bąk-Misiuk, J.
Domagała, J.
Dynowska, E.
Miotkowska, S.
Paszkowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931658.pdf
Data publikacji:
1994-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Wg
Opis:
The aim of the present paper is to study the possibility of application of the X-ray quasi-forbidden reflection method to the composition determination of the sphalerite-type Cd$\text{}_{1-x}$M$\text{}_{x}$Te = Mg, Zn, Mn) single crystals. The method is based on the property of quasi-forbidden reflections that their integral intensity is very sensitive to composition and weakly sensitive to crystal lattice defects. An example of application for a Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te single crystal is presented.
Źródło:
Acta Physica Polonica A; 1994, 86, 4; 575-578
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stereoscopic Observation of Synthetic Diamond with Haruta Stereo-Pairs of Synchrotron Transmission Double-Crystal Topographs
Autorzy:
Moore, M.
Lang, A. R.
Wierzchowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931679.pdf
Data publikacji:
1994-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
The Haruta method is used for stereoscopic observation of a 1.5 × 4 × 4 mm$\text{}^{3}$ cuboctahedral synthetic diamond with transmission double-crystal topography. The experiments were performed using a synchrotron double-crystal arrangement with asymmetrical diamond 220 reflection selecting 1.0 Å radiation. The appropriate Haruta pairs were matched from a series taken with positions on the rocking curve changed by small intervals. A reasonable stereoscopic effect was observed for most defect images, particularly dislocations, stacking faults and growth sector boundaries. It was established that some interference fringes do not produce good stereoscopic effects and appear on the exit surfaces of the diamond.
Źródło:
Acta Physica Polonica A; 1994, 86, 4; 613-616
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Apport des techniques EXAFS et apparentées a la determination de lordre local: application a la tribologie
Autorzy:
Lopez, J.
Le Bossé, J. C.
Hansali, G.
Belin, M.
Martin, J. M.
Powiązania:
https://bibliotekanauki.pl/articles/1929260.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Lx
Opis:
CONTRIBUTION OF EXAFS-LIKE TECHNIQUES TO THE DETERMINATION OF LOCAL ORDER: APPLICATION TO TRIBOLOGY: The determination of local order at atomic scale becomes more and more fundamental for understanding superficial phenomena such as tribology and catalysis. Among a few techniques available in this field, we are only concerned with the EXAFS-like ones (EXAFS, SEXAFS, EXELFS, SEELFS, etc.). The difficulties appearing all along the numerical treatment of such spectra are carefully analysed and a methodology is proposed in view to obtain reliable radial distribution functions. Some applications of these techniques are presented in two fields connected with tribology: friction induced amorphisation in high vacuum and characterization of interfacial solid bodies created during a wear process including an antiwear additive.
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 551-566
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron White Beam Topographic Studies of Gallium Arsenide Crystals
Autorzy:
Wierzchowski, W.
Wieteska, K.
Graeff, W.
Powiązania:
https://bibliotekanauki.pl/articles/1964178.pdf
Data publikacji:
1997-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
A series of samples cut out from different types of gallium arsenide crystals with low dislocation density were studied by means of white beam synchrotron topography. The investigation was performed with transmission and back-reflection projection methods and transmission section method. Some of the topographs in transmission geometry provided a very high sensitivity suitable for revealing small precipitates. The transmission section images significantly differed depending on the wavelength and absorption. In some cases a distinct Pendellösung fringes and fine details of dislocation and precipitates images were observed. It was possible to reproduce the character of these images by means of numerical simulation based on integration of Takagi-Taupin equations. Due to more convenient choice of radiation, synchrotron back-reflection projection topography provided much better visibility of dislocations than analogous methods realized with conventional X-ray sources.
Źródło:
Acta Physica Polonica A; 1997, 91, 5; 1015-1019
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Graphical Representation of Correlations Between Peak Positions
Autorzy:
Paszkowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1920849.pdf
Data publikacji:
1992-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Wg
Opis:
The properties of linear combinations of peak positions are analysed. It is concluded that the distribution of combinations contains the information on lattice constants. These combinations are represented by sharp maxima. Examples of the distribution for a powder pattern of orthorhombic symmetry are presented.
Źródło:
Acta Physica Polonica A; 1992, 82, 1; 157-161
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Absolute Structure Determination in Absence of Heavy Scatterers
Autorzy:
Grochowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1963368.pdf
Data publikacji:
1997-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Yh
33.15.Bh
61.10.Nz
Opis:
Methods of absolute structure determination for molecules containing only light atoms (C, H, N, O) are discussed in the paper. This experimentally difficult problem has a direct application in the structure determination of naturally originated compounds and modern chiral drugs. Several experimental methods of absolute structure determination like electron diffraction, multiple X-ray diffraction and X-ray anomalous scattering techniques are briefly discussed and compared. An application of dedicated azimuthal scan method for the case of hexamethylenetetramine is given as an illustration of this technique.
Źródło:
Acta Physica Polonica A; 1997, 91, 4; 745-756
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Determination of Reflection Phases by Three-Beam Diffraction and its Applications
Autorzy:
Hümmer, K.
Schwegle, W.
Weckert, E.
Powiązania:
https://bibliotekanauki.pl/articles/1920833.pdf
Data publikacji:
1992-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Dp
Opis:
Information on phase relationships between Bragg reflections can be obtained by the interference of Bragg waves. In the three-beam case, phase difference is given by a structure invariant triplet phase relationship. The intensity variation due to the three-beam interaction can be best measured by a ψ-scan experiment. The resulting ψ-scan diffraction profiles scanning through a three-beam position uniquely depend on the triplet phase relationship involved. In principle each three-beam profile is given by a superposition of a symmetrical phase-independent and a phase-dependent profile. Thus, triplet phases can be determined experimentally with an accuracy of about 45 degrees. The ψ-scan method is discussed and some examples of applications to the determination of the absolute structure as well as to the structure determination by combination of measured triplet phases with direct methods are given.
Źródło:
Acta Physica Polonica A; 1992, 82, 1; 83-102
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Standing Wave Technique as a Tool in the Study of the Imperfect Crystals
Autorzy:
Pełka, J.
Auleytner, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920851.pdf
Data publikacji:
1992-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
The application of the X-ray standing wave (XSW) technique in the case of imperfect crystals meets serious theoretical and interpretational problems. However, well-known advantages of the XSW technique make it especially interesting to the study of the ordering of impurities and of various processes leading to changes in this ordering in various likes of imperfect crystals. In this work we try to answer the question how imperfection of a crystal may influence the changes in fluorescence yield during the XSW measurement. Two likes of imperfect crystals are studied: Si(111) implanted with high energetic Bi$\text{}^{+}$ ions, and Zn$\text{}_{1-x}$Co$\text{}_{x}$Se single crystal with natural (111) face. The discussion of obtained results shows that general features of the X-ray standing wave field are conserved despite the considerable imperfections of the crystals. The results seem to support the applicability of the XSW technique to the study of imperfect materials, although some further theoretical effort would be required.
Źródło:
Acta Physica Polonica A; 1992, 82, 1; 163-171
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to Distinguish Perfect Quasi-Crystals from Twins and Other Structures Using Diffraction Experiments?
Autorzy:
Wolny, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920856.pdf
Data publikacji:
1992-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.-i
Opis:
Performing diffraction experiments for various lengths of coherent scattering and using the scaling of peak intensities on a number of atoms one can experimentally distinguish quasi-crystals from the other structures (e.g. twins or random). For perfect quasi-crystals peak intensities scale as N$\text{}^{2}$, for other structures this scaling depends on concentration of atoms, behaving critical for Penrose concentration.
Źródło:
Acta Physica Polonica A; 1992, 82, 1; 173-177
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 241

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