Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 13

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

Search:
in the keywords:  68.60.Dv
help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Content available remote

Thermal Stability of Porous Anodic Alumina Formed in Electrolytes with Surfactant Additives

100%
Shulgov V.
Acta Physica Polonica A
|
2018
|
vol. 133
|
issue 4
767-770
EN
Thermal stability of porous anodic alumina formed in various electrolytes is discussed. The bending deflection of the samples measured was converted to thermal stress. A model of transformation of the pore morphology during the re-anodizing in the electrolyte at the voltage increased relative to the voltage of the primary anodization is proposed.
2
Publication available in full text mode
Content available

Thermal Desorption of Au from W(001) Surface

51%
Błaszczyszyn R., Chrzanowski J., Godowski P.
Acta Physica Polonica A
|
2002
|
vol. 102
|
issue 6
785-794
EN
Adsorption of Au on W(001) at 450 K up to multilayer structures was investigated. Temperature programmed desorption technique was used in determination of coverage dependent desorption energy (region up to one monolayer). Results were discussed in terms of competitive interactions of Au-Au and Au-W atoms. Simple procedure for prediction of faceting behavior on the interface, basing on the desorption data, was postulated. It was deduced that the Au/W(001) interface should not show faceting tendency after thermal treatment.
3
Content available remote

Phototermal Spectra of Inhomogeneous Coatings

51%
Popovic M., Galovic S., Stojanovic Z.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue 4
535-537
EN
In this paper we demonstrate a theoretical study for photothermal measurements on inhomogeneous coatings. First, a general photothermal mathematical model for thermal gradient materials is presented. Then, we discuss the effects of inhomogeneous thermal properties in photothermal amplitude and phase spectra of coatings. Finally, a method for quantitative depth profiling that makes use of prior knowledge about the type of profile existing in a sample to reduce the instabilities associated with the mathematically ill conditioned task is demonstrated.
4
Content available remote

High Temperature Annealing of Ion-Plasma Nanostructured Coatings Based on AlN-TiB_2(TiSi_2)

51%
Pogrebnjak A., Abadias G., Bondar O., Sobol O., Beresnev V., Pshyk A., Demianenko A., Belovol K., Kolesnikov D., Komsta H.
|
|
vol. 125
|
issue 6
1284-1287
EN
The coatings investigated in this paper were deposited via the magnetron sputtering of AlN-TiB_2-Ti-Si_2 target in Ar atmosphere. The investigation of structural-phase composition, element composition, morphology and mechanical properties before and after annealing up to 1350°C was carried out. The concentration of elements in the coating was changed after annealing at 900°C and further annealing at 1350°C (especially after annealing at 1350°C). The hardness of as-deposited coatings was 15 GPa, but after annealing at 1350°C the value of hardness increased up to 22÷23.5 GPa. The value of the viscoplastic index was 0.07. All this provide high damping properties of the coating, and amorphous-like structure makes promising the use of these coatings as diffusion barriers in the form of independent elements, and as a contacting layer in multilayer wear resistant coatings.
5
Content available remote

Thermodynamic Stability of Two Rhombohedral Phases of Si_{0.5}Ge_{0.5} Alloy

51%
Bogusławski P.
Acta Physica Polonica A
|
1991
|
vol. 80
|
issue 2
299-302
EN
Thermodynamic stability of two ordered phases, RS1 and RS2, of Si_{0.5}Ge_{0.5} alloy is considered. Bulk and surface formation enthalpies are calculated using the model Tersoff's potential. RS2 structure is unstable, but its (001) ordered surface is stable against segregation. Properties of RS1 are just the opposite.
6
Content available remote

Stm Observed Surface Structures and Magnetic Properties of MBE-Grown Metallic Thin Films

51%
Kalinowski R., Baczewski L., Wawro A., Meyer C., Raułuszkiewicz J.
Acta Physica Polonica A
|
1998
|
vol. 93
|
issue 2
409-413
EN
Rare-earth epitaxial thin films of Tb and Gd of the thicknesses between 2 nm and 16 nm were deposited by means of molecular beam epitaxy method. The roughness of the rare-earth films measured by scanning tunneling microscopy was found to be in the range of 1-4.5 nm. The influence of the roughness on the dipolar anisotropy and magnetocrystalline surface anisotropy was estimated. The magnetic measurements have shown that the Gd layers deposited on the Y buffer layers had an easy plane anisotropy. However, for 2 nm thick Gd layer deposited on W buffer layer the perpendicular anisotropy was observed. According to the roughness analysis the possible sources of the perpendicular anisotropy in this sample is mainly the magnetoelastic anisotropy, but the presence of the magnetocrystalline surface anisotropy also cannot be neglected.
7
Content available remote

Surface Stability of Ordered Ga_{0.5}In_{0.5}P and GaAs_{0.5}Sb_{0.5} Alloys

51%
Bogusławski P.
Acta Physica Polonica A
|
1991
|
vol. 79
|
issue 1
125-128
EN
Formation enthalpies of (001) surfaces terminating ordered Ga_{0.5}In_{0.5}P and GaAs_{0.5}Sb_{0.5} alloys were calculated using the VFF model. For several ordered phases, chemically ordered surfaces were found to be stable against surface segregation. In particular, even phases unstable against bulk segregation may be terminated by a stable surface.
8
Content available remote

Structure and Stress in Au/Cu Two-Layer System during Annealing at Different Temperature

51%
Chocyk D.
|
EN
In this work, the Au/Cu two-layer systems, with the total thickness equal to 30 nm are studied. The two-layer systems were deposited by thermal evaporation in a UHV system on the silicon substrate at room temperature. After deposition the samples were annealed. We examined samples subjected to thermal cycle with the different maximum temperature. The X-ray diffraction and X-ray reflectometry are performed for systems before and after annealing. It was found that during the cycle of annealing above 150°C starts process of penetration of the Au layer by Cu atoms results in alloying. In Au/Cu systems, the final layer is the ordered Au/Cu₃ phase.
9
Publication available in full text mode
Content available

Porosity of Low-κ Materials Studied by Slow Positron Beam

51%
Brusa R., Macchi C., Mariazzi S., Karwasz G.
Acta Physica Polonica A
|
2005
|
vol. 107
|
issue 4
702-711
EN
The information about porosity in low-κ materials obtainable by depth profiling with positron annihilation spectroscopy is reviewed. In particular we focus on Doppler broadening spectroscopy and 2-3γ ratio of positronium measurements on SiOCH and amorphous carbon a-C:F:H thin films produced by plasma enhanced chemical vapour deposition.
10
Content available remote

Oxidation Behavior of AlTiN/TiN Nanolayer Hard Coating at High Temperatures

45%
Çalışkan H., Karaoğlanlı A.
|
|
vol. 125
|
issue 2
456-458
EN
Hard machining and high speed cutting are challenging machining processes demanded for high productivity for several decades. Hard coatings are mostly used for protection of the tool materials from severe tribological conditions in which excessive cutting temperatures and forces take place during these processes. Oxidation resistance is an important property of the hard coatings in hard machining operations due to high temperatures up to 1000C at the cutting edge. Improvement of oxidation resistance provides longer tool life at dry cutting conditions. TiAlN-based coatings are known to have high oxidation resistance. In this paper, nanolayer AlTiN/TiN coating was deposited on cemented carbide substrates by industrial magnetron sputtering system. The need to understand the effect of nanolayered structure on the oxidation behavior of protective coatings in machining industry in terms of high temperature oxidation tests is the motivation of this investigation. The deposited coating was annealed at 1000C with different durations. Before and after the oxidation tests, the composition, structure and phases of the coating were determined by scanning electron microscopy in combination with energy-dispersive X-ray spectroscopy and X-ray diffraction, respectively. It was found that nanolayered structure improves oxidation resistance, and thereby, it provides longer tool life.
11
Content available remote

Characterization of Transparent and Nanocrystalline TiO_{2}:Nd Thin Films Prepared by Magnetron Sputtering

45%
Domaradzki J., Wojcieszak D., Prociow E., Kaczmarek D.
Acta Physica Polonica A
|
2009
|
vol. 116
|
issue S
S-75-S-77
EN
In this work structural and optical properties of TiO_{2} thin films doped with different amount of Nd have been outlined. The result have shown that by quantity of Nd amount in the film dense nanocrystalline or amorphous thin films were obtained.
12
Content available remote

Structural and Optical Characterizations of~Ge Nanostructures Fabricated by~RF Magnetron Sputtering and Rapid Thermal Processing

45%
Abd Rahim A., Hashim M., Rusop M., Jumidali M.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 1
16-19
EN
In this work, we use a simple and cost effective technique of sputtering followed by the rapid thermal processing at 900C for 30 s to form Ge nanostructures on the Si(100) substrate. A layer of Ge (300 nm) and Si cap layer (100 nm) were deposited using RF magnetron sputtering. Two samples were prepared: Ge layer with Si capping (Si/Ge/Si) and Ge layer without Si capping (Ge/Si). Scanning electron microscopy shows that subsequent annealing in a rapid thermal processing gives uniformed Ge or SiGe islands with an estimated size of 100-500 nm. For the Ge/Si sample, under post growth annealing there had vanished the deposited Ge layer as confirmed by energy dispersive X-ray analysis. Atomic force microscopy shows that the surface roughness increases by a factor of 15.55% as the islands formed. The Raman spectrum shows that good crystalline structures of the Ge and SiGe peaks are produced. High resolution X-ray diffraction reveals cubic and tetragonal Ge phases with estimated average crystallite sizes of 42 nm and 20 nm, respectively. The results showed that it is possible to grow high quality Ge and SiGe nanostructures using a simple technique of sputtering for potential applications in photonics and high speed devices.
13
Content available remote

The Microstructure and Thermal Stability of the Two-Component Melt-Spun Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS Amorphous/Amorphous Composite

38%
Ziewiec K., Wojciechowska M., Prusik K., Mucha D., Jankowska-Sumara I.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 4
927-930
EN
The aim of this study is to present the special features and properties of the two alloys of similar average chemical composition Ni₅₅Fe₂₀Cu₅P₁₀B₁₀, processed through two different routes. The first alloy was melt-spun after the ejection of homogeneous liquid using a traditional single chamber crucible, and the second alloy was ejected from a double chamber crucible as two separate liquids: i.e., Ni₄₀Fe₄₀B₂₀ and Ni₇₀Cu₁₀P₂₀, mixing only at the orifice area. The studies of the microstructure of the composite alloy were performed through the use of transmission electron microscopy and scanning electron microscopy. The Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ two-chamber melt-spun (TCMS) alloy, as well as the homogeneous Ni₅₅Fe₂₀Cu₅P₁₀B₁₀, Ni₄₀Fe₄₀B₂₀, and Ni₇₀Cu₁₀P₂₀ alloys, were heated to elevated temperatures and their characteristics studied by means of differential scanning calorimetry. The temperature resistivity change method was applied to the examination of the Ni₅₅Fe₂₀Cu₅P₁₀B₁₀ TCMS alloy. The phase composition after heat treatment was investigated using X-ray diffraction. The results of the microstructure examination show that the TCMS alloy is an amorphous/amorphous composite, and is notable for its Ni-Fe-B and Ni-Cu-P stripes resulting from its differentiated chemical composition. Another unique feature of the TCMS alloy is that it retains its wood-like morphology even after high-temperature heat treatment. The crystallisation of the TCMS alloy starts from the Ni-Cu-P constituent and ends with the Ni-Fe-B areas of the sample. The results are discussed on the basis of previous work completed on amorphous matrix composites.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.