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Low Temperature Specific Heat of BiOX (X = Cl, Br, and I) Single Crystals

100%
Bunda V., Bunda S., Kajňakova M., Feher A., Syrkin E., Feodosyev S.
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issue 5
986-987
EN
Low temperature specific heat of layered bismuth oxyhalide crystals has been studied in the temperature range from 2 to 50 K in zero and 8 T magnetic field. The expected Debye-like behaviour at the lowest temperatures (below 4-5 K) is established. Linear dependences of entropy and the Debye temperature as cross-correlation parameters are established. The small values of the Debye temperature and peculiarities of phonon spectra at lowest temperatures are discussed.
2
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Bond-Selective Excitation and Following Displacement of Ge Atoms in GeTe/Sb_{2}Te_{3} Superlattice

80%
Makino K., Tominaga J., Kolobov A., Fons P., Hase M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 2
336-339
EN
Phase change random access memory devices made from chalcogenides compounds, such as Ge_{2}Sb_{2}Te_{5}, have attracted much attention because of their high-speed read-write and low power consumption capabilities. The phase change in Ge_{2}Sb_{2}Te_{5} is thought to be characterized by the displacement of Ge atoms, accompanying relaxation of surrounding Sb and Te atoms. Here we examine a new approach, that is the manipulation of Ge-Te bonds using linearly-polarized femtosecond near-infrared optical pulses. As a result, p-polarized pump pulses are found to be more effective in inducing the precursor of phase change, probably due to the atomic arrangements along the unique axis of the superlattice structure.
3
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Structural Study of Polyethylene/Montmorillonite Systems

80%
Malicka A., Domka L.
Acta Physica Polonica A
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2008
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vol. 114
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issue 2
423-431
EN
The effect of modification of montmorillonite (with 3-aminopropyltrimethoxysilane or hexadecyltrimethylammonium chloride) on the mechanical properties of the composites based on HDPE Hostalen ACP 5831 with the modified montmorillonite as filler, was studied. The structures of the fillers and nanocomposites were characterised by the scanning electron microscopy and X-ray diffraction study. The effect of the filler modification on the mechanical parameters of the nanocomposites and their structure was assessed on the basis of determination of the mechanical resistance, elongation at maximum tearing stress, bending strength, deformation at the maximum force and elasticity modulus on bending (three-point bending strength).
4
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Production and Structural Investigation of Polyethylene Composites with Modified Kaolin

70%
Domka L., Malicka A., Stachowiak N.
Acta Physica Polonica A
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2008
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vol. 114
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issue 2
413-421
EN
The study was undertaken to evaluate the effect of the filler (kaolin) modification with silane coupling agents on the properties of the polyethylene (HDPE Hostalen ACP 5831) composites. Powder mineral fillers are added to polymers to modify the properties of the latter and to reduce the cost of their production. A very important factor is the filler dispersion in the polymer matrix. Kaolin modified with 3-methacryloxypropyltrimethoxysilane and pure kaolin were characterised by surface area, pore size, water absorbing capacity, paraffin oil absorbing capacity, bulk density, scanning electron microscopy observations and X-ray diffraction measurements. Their performance was characterised by determination of the mechanical resistance upon static stretching and tearing, and their structure was observed in scanning electron microscopy images. The results were compared to those obtained for the composites with unmodified filler and pure HDPE.
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