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    Wyświetlanie 1-10 z 10
    Tytuł:
    Surfactant Effect on Synthesis of Nanocrystalline La$\text{}_{x}$Sr$\text{}_{1-x}$MnO$\text{}_{3}$ by Hydrothermal Method
    Autorzy:
    Sin, W. L.
    Wong, K. H.
    Li, P. Li.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047246.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    82.70.Uv
    61.10.Nz
    Opis:
    Crystalline La$\text{}_{x}$Sr$\text{}_{1-x}$MnO$\text{}_{3}$ was prepared by a hydrothermal route in the presence of surfactant. The cationic surfactant of cetyltrimethylammonium bromide as a template is used to regulate the nucleation and crystal growth. The as-synthesized product was characterized by X-ray diffraction and transmission electron microscopy. Nanosized and uniform rod-like monocrystals of La$\text{}_{x}$Sr$\text{}_{1-x}$MnO$\text{}_{3}$ were obtained. Their magnetic properties were studied using a vibrating sample magnetometer. Our results reveal that the use of surfactant helps to lower the processing temperature and to speed up the formation and crystallization of La$\text{}_{x}$Sr$\text{}_{1-x}$MnO$\text{}_{3}$. The surfactant also provides us an additional means of controlling the nanocrystalline size and maintaining the stoichiometry of the as-prepared nanocrystallites.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 165-171
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Experimental Study on Unipolar Induction
    Autorzy:
    Chen, K.
    Li, X.
    Hui, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030345.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    03.50.De
    06.30.Ka
    41.20.Gz
    Opis:
    Unipolar induction phenomenon is a special kind of electromagnetic induction. There are two quite opposite theoretical explanations for this phenomenon, i.e., the N theory and the M theory. The research of unipolar induction has made significant progress, but there is no final conclusion by now. In this paper, an experiment of inversely rotating double Faraday disks and double magnets are designed, and the unipolar induction phenomenon is verified by means of theoretical calculation and experiment. Comparing and analyzing the theoretical calculation and experiment results, our experimental results support the N theory, that is to say, our experiment shows that the magnetic field does not rotate when the magnet rotates.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 271-274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free Volume Study on Three Types of Shape Memory Polymers by Positron Annihilation
    Autorzy:
    Ujihira, Y.
    Li, H.-L.
    Ito, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2008187.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Pf
    Opis:
    Temperature dependence of nanoscopic environment of shape memory polymers such as polynorbornene (T$\text{}_{g}$≈313 K), polyurethane (T$\text{}_{g}$≈321 K=dynamic viscoelasticity, destruction of hydrogen bond ≈353 K) and styrene-butadiene copolymer (T$\text{}_{m}$=333 K) is observed in terms of free volume parameters - average size, numerical concentration and size distribution - estimated from positronium lifetime measurement, and mechanisms of their shape recoveries are discussed at a molecular level.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 677-682
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Focused Ion Beam Imaging of Defects in Multicrystalline Si for Photovoltaic Application
    Autorzy:
    Miyamura, Y.
    Sekiguchi, T.
    Chen, J.
    Li, J.
    Watanabe, K.
    Kumagai, K.
    Ogura, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198415.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.-a
    61.85.+p
    61.72.Ff
    Opis:
    We demonstrate the imaging of the extended defects in Si materials using a focused ion beam instrument. Since Ga-ion beam has small penetration depth and high channeling character compared with electron beam, the secondary electron signal of focused ion beam is more sensitive to the surface morphology and crystallinity. We have tried to use this secondary electron imaging of focused ion beam for observation of various extended defects in Si materials for photovoltaic and semiconductor devices. As for the texture of multicrystalline Si, some grains are imaged darker than the others. It suggests that the crystal orientation gives different channeling effect on the primary Ga-ion beam, resulting in the different secondary electron yield. The grain boundaries and lineage in multicrystalline Si are shown as bright lines and patterns in the image. Although it may reflect the surface morphologies, these contrasts may be attributed to the channeling contrast due to lattice displacement or distortion. The contrast mechanism of FIB imaging is discussed.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 991-993
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Analysis of the TE Mode Cerenkov Type Second Harmonic Generation in Ion-Implanted X-Cut Lithium Niobate Planar Waveguides
    Autorzy:
    Du, G.
    Li, G.
    Zhao, S.
    Qiao, W.
    Yang, K.
    An, J.
    Li, M.
    Wang, J.
    Wang, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808109.pdf
    Data publikacji:
    2009-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Dd
    42.82.Et
    Opis:
    We present a study of the Cerenkov configuration second harmonic generation in X-cut ion-implanted lithium niobate waveguides. An approximate solution of conversion efficiency is given and plotted which shows that it is very sensitive to the waveguide depth and pump wavelength. The results can be used in the design of waveguides for the efficient second harmonic generation in the Cerenkov configuration.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 3; 685-689
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Graphics Processing Unit for In-Line Electron Holography
    Autorzy:
    Morawiec, K.
    Dłużewski, P.
    Kret, S.
    Szczepańska, A.
    Li, T.
    Sloan, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033020.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.37.Lp
    68.37.Og
    68.55.Nq
    42.30.Rx
    61.05.jp
    07.05.Pj
    42.30.-d
    42.30.Wb
    Opis:
    In the present work, software for exit electron wave reconstruction based on the iterative approach was implemented and a new method for drift-correction of the focal series was proposed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1353-1356
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Off-Axis Electron Holography of Magnetic Nanostructures: Magnetic Behavior of Mn Rich Nanoprecipitates in (Mn,Ga)As System
    Autorzy:
    Barańska, M.
    Dłużewski, P.
    Kret, S.
    Morawiec, K.
    Li, Tian
    Sadowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033003.pdf
    Data publikacji:
    2017-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.jp
    68.37.Lp
    07.05.Pj
    75.50.Pp
    Opis:
    The Lorentz off-axis electron holography technique is applied to study the magnetic nature of Mn rich nanoprecipitates in (Mn,Ga)As system. The effectiveness of this technique is demonstrated in detection of the magnetic field even for small nanocrystals having an average size down to 20 nm.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 5; 1406-1408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CdSe/ZnS Colloidal Quantum Dots with Alloyed Core/Shell Interfaces: A Photoluminescence Dynamics Study
    Autorzy:
    Dziatkowski, K.
    Ratchford, D.
    Hartsfield, T.
    Li, X.
    Gao, Y.
    Tang, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492859.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Hc
    78.47.jd
    78.55.Et
    Opis:
    Time-resolved photon counting technique was employed to study dynamics of photoluminescence from the ensemble and single CdSe/ZnS quantum dots with the alloyed core/shell interfaces. The ensemble data revealed enhanced effect of disorder-induced trap states for increasing emission energy, as implied from the changes in the distribution of total decay rates. The emission trajectories collected for single quantum dots showed familiar, two-state blinking pattern. It suggests that in a large-band-offset CdSe/ZnS system, the introduced alloying of the core-to-shell region cannot smooth enough the confinement potential in order to suppress nonradiative Auger recombination and blinking.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 870-873
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of the Initial Growth of Co on Ru(0001)
    Autorzy:
    Godowski, P. J.
    Onsgaard, J. J.
    Trzebiatowska-Gusowska, M. J.
    Pater, K. J.
    Li, Zhe
    Powiązania:
    https://bibliotekanauki.pl/articles/2047268.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.Dp
    79.60.Jv
    68.55.Jk
    Opis:
    The growth process of cobalt on Ru(0001) was characterized by photoelectron spectroscopy excited by X-ray and synchrotron radiation. The binding energy position and intensity of the Co 2p$\text{}_{3}\text{}_{/}\text{}_{2}$ and Ru 3d$\text{}_{5}\text{}_{/}\text{}_{2}$ core levels as well as the shape and structure of the valence band spectra corresponding to the different stages of the deposition were investigated. An observed small positive binding energy shift is a consequence of an increase in the cobalt adatoms coordination number. The core-level shift between bulk and surface Ru atoms is determined as -360 meV. Upon adsorption of cobalt, the interface peak appears with a shift of -(70÷80) meV relative to the bulk one. On the basis of unchanged energy positions and widths of the Ru-derived features of the valence band spectra, a weak interaction between cobalt and substrate is suggested. The measured valence band could be reproduced by superimposing the spectra of the pure elements.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 263-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-Probe Measurements of Electron Transport in GaN:Si/(Ga,Mn)N/GaN:Si Spin Filter Structures
    Autorzy:
    Kalbarczyk, K.
    Foltyn, M.
    Grzybowski, M.
    Stefanowicz, W.
    Adhikari, R.
    Li, Tian
    Kruszka, R.
    Kamińska, E.
    Piotrowska, A.
    Bonanni, A.
    Dietl, T.
    Sawicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398574.pdf
    Data publikacji:
    2016-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Dc
    73.40.Cg
    73.43.Qt
    78.55.Cr
    Opis:
    Results of two-probe magnetoresistance studies in GaN:Si/(Ga,Mn)N/GaN:Si prospective spin filter structures are reported. It is postulated that transport characteristics are strongly influenced by highly conductive threading dislocations and that shrinking of the device size partially mitigates the issue. Simultaneously, maxima at ≈1500 Oe on overall weak, up to 2%, negative magnetoresistance are seen at low temperature, whose origin has been tentatively assigned to effects taking place at the contacts areas.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 5; 1196-1198
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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