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Wyświetlanie 1-15 z 28
Tytuł:
X-ray Diffraction Investigations of Structure of Silicon Single Crystals after Irradiation by Heavy Ions
Autorzy:
Auleytner, J.
Khrupa, V. I.
Datsenko, L. I.
Krasulya, S. M.
Skorokhod, M. J.
Powiązania:
https://bibliotekanauki.pl/articles/1945213.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.40.-z
68.35.Bs
Opis:
Structure distortions appearing near the surfaces of crystals irradiated by high energy ions (H, Kr, U) accelerated till energy of several MeV using respectively the accelerator U-120 (Kiev, Ukraine), the heavy ions accelerators (Caen, France and Darmstadt, Germany) were investigated by means of various X-ray diffraction methods (topography and diffractometry). Nonhomogeneous distribution of lattice distortions near the surfaces of irradiated crystals were discovered using these methods in all of the samples. Besides the barrier zones where the accelerated ions stopped, the wide distorted regions situated nearer the surface were found. The fine structure of different zones, their extents as well as the level of static Debye-Waller factor were determined. The depth distribution of this factor was compared with the results obtained by using the edge contrast measurements some years ago. This permitted us to draw conclusions about some relaxation of elastic strains in the interference regions after many years.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 301-307
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
X-Ray Diffraction Investigations of NdGaO$\text{}_{3}$ Single Crystal
Autorzy:
Mazur, K.
Sass, J.
Giersz, W.
Reiche, P.
Schell, N.
Powiązania:
https://bibliotekanauki.pl/articles/1964526.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.50.Ks
68.35.Bs
Opis:
Neodymium gallium perovskite single crystals grown with the Czochralski method were examined with several complementary X-ray methods. By means of X-ray diffraction topography and reciprocal space diagram the structural perfection and crystal homogeneity of the studied wafers were determined. Additionally, the results of the X-ray reflectometry investigations of the surface perfection after the mechanochemical treatment are presented.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 226-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Structure of the (100) Surface of Ag-In-Gd 1/1 Approximant
Autorzy:
Hars, S.
Sharma, H.
Smerdon, J.
Yadav, T.
Tamura, R.
Shimoda, M.
McGrath, R.
Powiązania:
https://bibliotekanauki.pl/articles/1203006.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.44.Br
68.35.Bs
68.37.Ef
71.23.Ft
Opis:
Scanning tunneling microscopy is employed to characterise the structure and morphology of the (100) surface of the Ag-In-Gd 1/1 approximant. The surface prepared by the usual method of sputter-annealing produces step-terrace structure. Observed step heights are consistent with the lattice constant of the bulk. Scanning tunneling microscopy on terraces reveals cluster-like protrusions arranged with a square unit cell as expected from the bulk. It has not been possible to assign the terraces to the specific bulk planes because of lack of atomic resolution on terraces.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 479-481
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Roughness by X-ray and Neutron Scattering Methods
Autorzy:
Sinha, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/1945176.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.10.Dp
68.35.Bs
78.20.Ci
Opis:
We discuss how the roughness and morphology of surfaces and interfaces can be characterized by the nondestructive techniques of X-ray and neutron scattering. We first discuss the mathematical description of rough surfaces in terms of correlation functions and then discuss the various kinds of rough surfaces which exist. These fall into the category of self-affine (Gaussian) surfaces, surfaces with capillary wave fluctuations, stepped surfaces, and surfaces with islands or pits. We then discuss how the scattering from such surfaces may be described and which types of information are available from specular reflectivity, off-specular (diffuse) scattering, and grazing incidence reflection experiments, including a comparison with results obtained by other surface techniques. We then discuss multiple rough interfaces and the scattering from thin films and multilayers. Finally, we shall discuss scattering of neutrons by magnetically rough surfaces and multilayers.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 219-234
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface of BiSrCaCuO Single Crystal Observed by Means of Scanning Tunneling Microscope
Autorzy:
Witek, A.
Reich, A.
Czajka, R.
Pajączkowska, A.
Rauluszkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1891851.pdf
Data publikacji:
1991-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Vy
61.16.Di
68.35.Bs
Opis:
The topographic images of a Bi$\text{}_{0.7}$Pb$\text{}_{0.3}$SrCaCu$\text{}_{1.8}$O$\text{}_{x}$ single crystal were studied by means of the scanning tunneling microscope. The structure of terraces and steps seen on the surface reflects the crystallographic structure of bulk.
Źródło:
Acta Physica Polonica A; 1991, 80, 5; 717-722
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconducting Lead Granular Layer Prepared by Reducing in Hydrogen Lead of Germanate Glasses
Autorzy:
Gackowska, J.
Gazda, M.
Trzebiatowski, K.
Kusz, B.
Powiązania:
https://bibliotekanauki.pl/articles/2046760.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Fs
68.35.Bs
68.37.Ps
71.23.Cq
Opis:
The thin layer of Pb granules on the surface of the lead-germanate glass was prepared by thermal annealing in hydrogen. The structure and superconducting properties of lead layer depend on temperature and time of reduction. The influence of time and temperature of reduction on the properties of the reduced layer thickness has been studied.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 591-596
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Relative Stability of Si$\text{}_{n}$ (n=10-16) Clusters
Autorzy:
Mahtout, S.
Belkhir, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/2046815.pdf
Data publikacji:
2006-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
36.40.-c
61.43.Bn
61.46.+w
68.35.Bs
Opis:
Ab initio molecular dynamics simulated annealing technique coupled with density functional theory in the local density approximation implemented in Spanish initiative for electronic simulations with thousands of atoms method is employed to search the ground state geometries of silicon clusters containing 10-16 atoms. We found a number of new isomers which are not previously reported. The atoms in all these clusters exhibit pronounced preference for residing on the surface. The binding energies increase while the highest occupied-lowest unoccupied molecular orbital gap generally decreases with the increase in clusters size.
Źródło:
Acta Physica Polonica A; 2006, 109, 6; 685-693
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
STM/AFM Images and Tunneling Spectra of Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ Single Crystals
Autorzy:
Susła, B.
Sadowski, W.
Klimczuk, T.
Czajka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1964375.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
74.72.Jt
68.35.Bs
Opis:
The results of the scanning tunneling microscopy and spectroscopy as well as atomic force microscopy measurements on the Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ single crystals in ambient conditions are reported. Using the scanning tunneling microscopy we were able to modify the Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ ab-plane in air under the conditions of sample bias voltage V$\text{}_{t}$=500 mV and set current I$\text{}_{s}$=0.3 nA. It is possible to prepare atomically flat and clean surfaces as well as to create new structures in a nanometer scale in these electron-doped materials. The similar processes were not observed during atomic force microscopy imaging.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 209-214
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-Assembled Parallel Mesoscopic Pb Wires on Vicinal Si(111)
Autorzy:
Jałochowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/2014187.pdf
Data publikacji:
2000-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
68.65.+g
68.35.Bs
68.55.Jk
81.15.Ef
Opis:
The work presents a novel method of production of mesoscopic metallic wires on semiconducting surfaces. Making use the self-assembly phenomenon, arrays of extremely long and perfectly parallel mesoscopic Pb-wires on vicinal Si(111) substrates are formed and studied in UHV conditions. Before deposition of Pb a uniform distribution of monoatomic steps and terraces was induced by formation of Au chains running along step edges. The wires growing on the substrates held at temperatures close to the room temperature reach up to 8 µ length. A reflection high electron energy diffraction experiment shows that the wires laying on Si(533) along the step edges have triangular cross-section determined by (111) and (100) facets of Pb. Scanning tunneling microscopy images collected at low temperatures have enabled us to determine details of the wires shape and morphology of the substrate. The width of the wires was approximately equal to 60 nm whereas their height was about 10 nm. The observed strong growth anisotropy is attributed to step edge barriers and high Pb mobility on the smooth Si(111) narrow terraces that form vicinal surfaces and the anisotropic strain due to large misfit between Pb and Si lattices.
Źródło:
Acta Physica Polonica A; 2000, 98, 3; 259-269
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of Surface Relaxation and Reconstruction Phenomena
Autorzy:
Zieliński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1945187.pdf
Data publikacji:
1996-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.-p
68.35.Bs
68.35.Md
68.35.Rh
Opis:
The basic definitions concerning structure of surface are given. The principal experimental methods of the observation of surfaces are reviewed. A possibly heuristic explanation is given of principal theoretical concepts underlying the present understanding of the surface phenomena. The best known and/or understood examples of the surface relaxation, surface reconstruction and roughening are reviewed.
Źródło:
Acta Physica Polonica A; 1996, 89, 2; 251-263
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of Tungsten (111) and (211) Surfaces Induced by Carbon and Oxygen
Autorzy:
Szczudlo, Z.
Zuber, S.
Szczepkowicz, A.
Ciszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2035646.pdf
Data publikacji:
2002-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Bs
07.79.Cz
Opis:
Scanning tunneling microscopy is used to obtain images of reconstructed W(111) and W(211) surfaces. The reconstruction is induced by submonolayer coverages of carbon and oxygen.
Źródło:
Acta Physica Polonica A; 2002, 102, 6; 781-784
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reconstruction of the (001) Surface of Si from Molecular Dynamics
Autorzy:
Holender, J.
Jędrzejek, Cz.
Powiązania:
https://bibliotekanauki.pl/articles/1877536.pdf
Data publikacji:
1991-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Md
68.35.Bs
Opis:
The reconstruction of the (001) surface of Si at various temperatures is studied using molecular dynamics with many-body interactions. Two types of potentials were used: the Stillinger-Weber (SW), and Pearson and co-workers Axilrod-Teller type potential (AT). For Stillinger-Weber potential at low temperatures the (2x1) dimer reconstruction is about 0.07 eV per surface atom more preferable than the c(2x2)structure which is in agreement with the experimental reconstruction observed by STM. Contrary, for Axilrod-Teller type potential the c(2x2) structure is lower by 0.2 eV than the (2x1) structure. The silicon surface is stable up to 1500 K, all the dimers remain unbroken but some of them are tilted. The energies of various defects (suggested by STM studies) like single vacancy, two adjacent Si atoms vacancy, dimer vacancy, dimer vacancy with lower layer atoms rebonding and double dimer vacancy are estimated.
Źródło:
Acta Physica Polonica A; 1991, 79, 1; 117-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent Developments in Scanning Tunneling Microscopy
Autorzy:
Wiesendanger, R.
Powiązania:
https://bibliotekanauki.pl/articles/1929607.pdf
Data publikacji:
1993-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Bg
68.35.Bs
75.25.+z
Opis:
Scanning tunneling microscopy and related local probe methods have led to a novel perception of nanometer- and atomic-scale structures and processes. Since the structural information is obtained directly in real space, the scanning probe techniques offer considerable advantages compared with diffraction techniques for the investigation of non-periodic structures at solid surfaces. In addition, the local probe methods allow to study almost any kind of physical property of microstructures with submicron down to atomic resolution.
Źródło:
Acta Physica Polonica A; 1993, 84, 3; 419-421
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Properties and Photoemission of Microrelief Surfaces of III-V Semiconductors
Autorzy:
Dmitruk, N. L.
Mamikin, S. V.
Powiązania:
https://bibliotekanauki.pl/articles/1931741.pdf
Data publikacji:
1994-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Ns
68.35.Bs
78.30.Fs
Opis:
The optical properties (infrared reflectance) and the photoemission current for the surface-barrier structures of metal-semiconductor type with microrelief interface have been investigated. The participation of surface plasmon polaritons in internal photoemission of the Au-GaAs Schottky barriers has been observed.
Źródło:
Acta Physica Polonica A; 1994, 86, 5; 811-815
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Observation of Nickel Hydroxide Layer on Ni Electrode by in situ Atomic Force Microscopy
Autorzy:
Kowal, A.
Niewiara, R.
Perończyk, B.
Haber, J.
Powiązania:
https://bibliotekanauki.pl/articles/1945263.pdf
Data publikacji:
1996-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.Bs
Opis:
The layer of nickel hydroxide was formed on the surface of polycrystalline Ni immersed in 1 M KOH by cycling the potential in the range between -0.1 and 0.6 V vs. Pt in 1 M KOH. The layer thickness of 8.5 nm, estimated by an electrochemical method, corresponded to about 10 monolayers of Ni(OH)$\text{}_{2}$. The changes of thickness of the nickel hydroxide film during the process of its oxidation and reduction were monitored by the use of in situ atomic force microscopy with the tip fixed and the electrode potential scanned between -0.1 and +0.6 V at a scan rate of 100 mV/s. The process of oxidation resulted in the film thickness decrease by about 3 nm. This change could be explained as to be due to the removal of a proton from Ni(OH)$\text{}_{2}$ layer.
Źródło:
Acta Physica Polonica A; 1996, 89, 3; 401-404
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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