Temat: 68.18.Jk - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Magnetic Stripes on Hexagonal Lattice with Competing Exchange and Dipole-Dipole Interactions
Autorzy:: Joknys, A.
Tornau, E.
Powiązania:: https://bibliotekanauki.pl/articles/1813379.pdf
Data publikacji:: 2008-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.46.Bc
68.18.Jk
68.35.Rh
Opis:: We obtained the phase diagram for the Ising model with competing exchange and dipolar interactions on 2D hexagonal lattice. By using histogram method we determined the order of the phase transition from isotropic stripe phase to low-temperature anisotropic stripe phases AFh of different stripe widths h. The first order phase transition was found to AF1 and AF2 phases and the second order - to AF3 and AF4 phases. We have also found that in AF1 phase stripe domain grows with time as $t^{0.5}$. In phases AF3 and AF4 stripe domain growth is proportional to log t.
Źródło:: Acta Physica Polonica A; 2008, 113, 3; 951-954
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of Simultaneous Doping of $Li^+$ and $Fe^{3+}$ Ions in the $LiMn_2O_4$ Spinel Structure
Autorzy:: Nowicki, W.
Powiązania:: https://bibliotekanauki.pl/articles/1812247.pdf
Data publikacji:: 2008-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.66.Fn
75.47.Lx
68.18.Jk
73.21.Cd
Opis:: A series of compounds $Li_xMn_{3-x-y}Fe_yO_4$ (x=1.0125;0≤y≤0.05) were synthesized by solid state reaction of $Li_2CO_3$ with the manganese oxide or iron-manganese oxide precursors. Investigations of the structure transformation effect of double substitution with $Li^+$ and $Fe^{3+}$ ions in $LiMn_2O_4$, in the temperature range of 10-300 K, were undertaken using high-resolution X-ray powder diffraction at the HASYLAB (DESY) synchrotron. The $Li_{1.0125}Mn_{1.9625}Fe_{0.025}O_4$ transforms from cubic (Fd3̅ m) to orthorhombic (Fddd) below 250 K, and is stable to 10 K. Whereas in the $Li_{1.0125}Mn_{1.9375}Fe_{0.05}O_4$ oxide no phase transition was observed, this spinel remains in cubic structure down to the temperature of 10 K.
Źródło:: Acta Physica Polonica A; 2008, 114, 2; 375-382
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Miscibility of Perylene Derivatives with Fatty Acid in Two-Dimensional Binary Mixture
Autorzy:: Makowiecki, J.
Martynski, T.
Powiązania:: https://bibliotekanauki.pl/articles/1203963.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.18.-g
68.47.Pe
64.75.Jk
64.75.St
Opis:: Two component mixtures of a fluorescent perylene dye (derivative of 3,4,9,10-perylenetetracarboxylic acid) with arachidic acid in the whole range of mole fraction have been investigated in form of molecular monolayers at the air-water interface at different pH of the water subphase. Miscibility of the components in the Langmuir monolayers have been examined for pH 3 and pH 13 of the subphase. Using the Langmuir-Blodgett technique the monolayers were transferred onto freshly cleaved mica sheets and morphology of the films was analyzed using atomic force microscopy working in tapping mode. Investigation of the components miscibility in monolayers, determined by mean molecular area and surface pressure analysis reveals different behavior of the mixtures depending on pH of the subphase. Atomic force microscopy morphology images of the Langmuir-Blodgett films strongly support conclusion about the components mixing and coverage of the mica surface. It has been found that onto acidic subphases components are only miscible in vestigial form, whereas on alkaline the miscibility is strongly affected by the dye concentration.
Źródło:: Acta Physica Polonica A; 2014, 126, 3; 757-762
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Energy-Dispersive X-Ray Reflectometry and X-Ray Grazing Incidence Diffraction from Organic Multilayers
Autorzy:: Neißendorfer, F.
Bolm, A.
Pietsch, U.
Powiązania:: https://bibliotekanauki.pl/articles/1963393.pdf
Data publikacji:: 1997-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 68.18.+p
61.10.Kw
68.55.Jk
07.85.Qe
Opis:: The installation of the wavelength shifter at the BESSY I storage ring in Berlin makes it possible to apply the synchrotron radiation for white beam investigations of organic multilayers. Considering the energy characteristic of the synchroton radiation source and the absorbance of the beryllium window the synchrotron radiation can be used outside the UHV system for X-ray reflectometry and X-ray diffuse scattering between about 3 keV and 25 keV. Between 3 and 10 keV the synchrotron radiation intensity is high enough to realize the grazing incidence diffraction mode in order to get in-plane information. The capability of the methods is demonstrated at the example of a Pb-stearate multilayer covered by a thin polyelectrolytic polymer layer.
Źródło:: Acta Physica Polonica A; 1997, 91, 4; 829-833
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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