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    Wyświetlanie 1-15 z 15
    Tytuł:
    Manifestation of a Coexistence of the Long-Periodic Phase with the Incommensurate Phase
    Autorzy:
    Sveleba, S.
    Polovinko, I.
    Zhmurko, V.
    Pankivskyi, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2011086.pdf
    Data publikacji:
    1999-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    Opis:
    Electric and optical properties of the commensurate ferroelectric long-periodic phase in [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{2}$ZnCl$\text{}_{4}$ and [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{2}$CoCl$\text{}_{4}$ crystals were investigated to explain mechanism of the double hysteresis loops appearance.
    Źródło:
    Acta Physica Polonica A; 1999, 96, 3-4; 437-444
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic Features of the Modulated Phases in (MgGeF$\text{}_{6}$)·6H$\text{}_{2}$O Crystals
    Autorzy:
    Pankivskyi, Yu.
    Sveleba, S.
    Hrabanski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038375.pdf
    Data publikacji:
    2004-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    Opis:
    The temperature dependences of the optical birefringence δ(Δ n$\text{}_{c}$) in (MgGeF$\text{}_{6}$)·6H$\text{}_{2}$O crystal have been investigated. Specific properties observed in experiment such as global hysteresis, kinetic effect, thermooptic memory effect, localization of the incommensurability wave vector on the commensurate values of higher order, sensibility to the external mechanical stress confirm the existence of the incommensurate phase in current crystals.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 4; 467-474
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of High Temperature Phase Transitions in (NH$\text{}_{3}$c$\text{}_{2}$H$\text{}_{5}$)$\text{}_{2}$CuCl$\text{}_{4}$ Crystals
    Autorzy:
    Kapustianik, V.
    Korchak, Yu.
    Sveleba, S.
    Tchukvinskyi, R.
    Girnyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1995610.pdf
    Data publikacji:
    1999-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    Opis:
    On the basis of dilatometric, optical, and dielectric investigations of (NH$\text{}_{3}$C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{2}$CuCl$\text{}_{4}$ crystals the existence of phase transitions at T$\text{}_{1}$=364 and T$\text{}_{2}$=356 K was confirmed. Anomalous behaviour of the thermal expansion coefficient and optical birefringence around T$\text{}_{3}$=330 K was related to earlier unknown phase transition. Besides, it was shown that these crystals are characterised by considerable protonic conductivity, the nature of which is fairly well explained in the framework of Grotthus mechanism of proton transport.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 3; 351-357
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behaviour of the Optical Birefringence in Conditions of the "Viscous" Interaction
    Autorzy:
    Sveleba, S. A.
    Zhmurko, V. S.
    Pankivskyi, Yu. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012956.pdf
    Data publikacji:
    2000-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    Opis:
    The temperature dependences of optical birefringence δ(Δn) for the principal cuts of [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{2}$CuCl$\text{}_{4}$ crystals are measured. On the basis of the obtained experimental and theoretical data the anomalous behavior of physical parameters in conditions of the "viscous" interaction of the modulated structure with mobile defects in the incommensurate phase is explained.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 2; 337-348
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric and Dilatometric Properties of NH(CH$\text{}_{3}$)$\text{}_{3}$CuCl$\text{}_{3}$·2H$\text{}_{2}$O Low Dimensional Ferroics
    Autorzy:
    Korchak, Yu.
    Kapustianik, V.
    Batiuk, A.
    Girnyk, I.
    Czapla, Z.
    Dacko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872270.pdf
    Data publikacji:
    2004-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    Opis:
    On the basis of dilatometric and dielectric investigations of NH(CH$\text{}_{3}$)$\text{}_{3}$CuCl$\text{}_{3}$·2H$\text{}_{2}$O crystals the earlier unknown phase transition with considerable temperature hysteresis was found at T$\text{}_{1}^{c}$=198 K and T$\text{}_{1}^{h}$=223 K, respectively, in cooling and heating runs. Existence of the characteristic dielectric dispersion was revealed within the high-temperature phase. It corresponds to the single dielectric relaxator below 250 K as well as to co-existence of two relaxators above this temperature. The determined values of the activation energy and relaxation time are characteristic of the co-operative reorientation of the trimethylammonium cation (high-frequency relaxator) whereas the combined reorientation motions of the CuCl$\text{}_{2}$·2H$\text{}_{2}$O chains would be responsible for the low-frequency relaxation process. It was found that the above mentioned quasi-Debye type processes are involved into the mechanisms of the protonic conductivity.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 1; 39-49
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peculiarities of Dielectric Relaxation in DMAAS Ferroelectric Crystals
    Autorzy:
    Kapustianik, V.
    Czapla, Z.
    Czukwinski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035537.pdf
    Data publikacji:
    2002-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    77.84.-s
    Opis:
    This paper presents the results of investigations of the dielectric properties of NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$×6H$\text{}_{2}$O crystals performed in a wide frequency range. In particular, the temperature and frequency dependences of the dielectric permittivity were measured in the region of ferroelectric phase at different rates of temperature change. The thermal dipole relaxation with a critical slowing-down at T$\text{}_{c1}$ was observed at comparatively low frequencies of measuring field. The relaxation connected with the domain freezing takes place at still lower frequencies (below 100 kHz) and was found to be strongly dependent on the rate of the temperature change. It was shown that deuteration results in a noticeable change of the parameters characterising this process including the temperature of domain wall freezing.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 3; 365-372
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Temperature Dependence of Domain Structure in Cobalt
    Autorzy:
    Szmaja, W.
    Polański, K.
    Dolecki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964829.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.60.-d
    64.70.-p
    Opis:
    The type-I magnetic contrast in a scanning electron microscope is used to study the domain behaviour on the basal planes of cobalt monocrystals of different thicknesses during a heating cycle. Digital image processing is applied to the original scanning electron microscope images for their restoration, enhancement and analysis. The main reasons for the application of digital image processing are: low level of type-I magnetic contrast, particularly used at the higher temperatures, and the complex character of the magnetic domain structure. The changes in both domain structures and type-I magnetic contrast are due to the strong temperature dependence of magnetocrystalline anisotropy energy for the hcp phase of cobalt, which implies the rotation of magnetic easy axis from the c-axis to the basal plane. The temperature of the magnetic phase transition between an open-flux and a closed-flux domain configuration was found to be dependent on the specimen thickness. The changes in domain structure during the heating cycle were reversible under the condition that the specimen was not carried through the hcp-to-fcc phase transition. Otherwise, they were partially or completely irreversible and were caused by crystal imperfections originating from the transition. The paper shows the great advantage of using digital image processing system for data restoration, enhancement and analysis.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 469-472
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Study of the Phase Transitions in Potassium Hydrogen Sulphate KHSO$\text{}_{4}$
    Autorzy:
    Tahoon, K. K.
    Abosehly, A. M.
    Abdel-Kader, M. M.
    El-Sharkawy, A. A.
    El-Mansi, F. M
    Powiązania:
    https://bibliotekanauki.pl/articles/1931565.pdf
    Data publikacji:
    1994-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-f
    64.70.-p
    Opis:
    We report on some thermal properties (specific heat capacity C$\text{}_{p}$, thermal conductivity λ, and thermal diffusivity σ) in addition to the differential thermal analysis thermogram and thermogravimetric analysis for potassium hydrogen sulphate (KHS), KHSO$\text{}_{4}$. The accurate measurements of the above-mentioned parameters as functions of temperature revealed that the compound undergoes two structural phase transitions around 100°C and 175°C. It seems also likely that the compound behaves as a poorly conducting material and hence the maul mechanism of the heat transfer is due to phonons. The data are correlated to the crystal structure including the two different HSO¯$\text{}_{4}$ ions.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 3; 349-355
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SnTe Phase Transition in Strained Superlattices PbTe/SnTe
    Autorzy:
    Mironov, O. A.
    Makarovskii, O. N.
    Nashchekina, O. N.
    Shpakovskaya, L. P.
    Litvinov, V. I.
    Oszwałdowski, M.
    Berus, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933932.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    73.40.-c
    Opis:
    An anomaly of the in-plane conductivity is observed in the superlattices PbTe/SnTe on (001)KCl in the temperature region of 60-130 K. The anomaly is caused by a structural phase transition in SnTe layer and as a result, the transition induced formation of defects. These defects are additional scattering centres which decrease the superlattice conductivity.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 853-856
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Size Evolution of the Light Induced Sodium Clusters
    Autorzy:
    Hnat, B.
    Jakubczyk, D.
    Kolwas, K.
    Kolwas, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920745.pdf
    Data publikacji:
    1992-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.40.+d
    31.70.Hq
    64.70.-p
    Opis:
    We report the observation of the size evolution of the laser light formed clusters. A cell containing sodium vapor and the buffer gas (He) under high pressure was used in the experiment. Changes of the radius and of the density of transient clusters were observed via the time evolution of the intensity of right-angle scattered light. The rate of the cluster radius growth was found to vary from 0.012 to 0.1 μm/s.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 6; 629-637
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolution of Laser Light Induced Sodium Clusters
    Autorzy:
    Kolwas, M.
    Kolwas, K.
    Jakubczyk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931531.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    31.70.Hq
    36.40.+d
    Opis:
    We investigated the growing sodium clusters, induced by the laser light resonant with a sodium dimer transition. We observed the intensity of light scattered by clusters. The clusters were produced in the stainless steel cell containing sodium vapor and helium. We obtained data on cluster mean size and dynamics from fitting the theoretical formulas to the experimental data. The model of clusters' evolution basing on the thermodynamics of the vapor-liquid transition was applied.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 257-266
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Simulations of the Ashkin-Teller Model
    Autorzy:
    Dębski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013697.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Hk
    75.40.Mg
    64.70.-p
    Opis:
    Monte Carlo simulations are used to analyse the behaviour of the extended Ashkin-Teller model in two (2D) and three (3D) dimensions from the ratio of the square of the second moment of the order parameter to its fourth moment. The critical surface in three dimensional parameter space is calculated in regions where the Ising transitions are expected both for the ferro-and antiferromagnetic regions.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 859-862
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric Study of Pressure Induced fcc-sc Phase Transition in Fullerene C$\text{}_{60}$
    Autorzy:
    Trybuła, Z.
    Krupski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014286.pdf
    Data publikacji:
    2000-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Wz
    62.50.+p
    64.70.-p
    77.22.Ch
    Opis:
    Phase transition in polycrystalline fullerene C$\text{}_{60}$ from fcc phase to a simple cubic phase sc induced by hydrostatic pressure up to 0.5GPa was studied by dielectric method. Pressure coefficient dT$\text{}_{c}$/dp=144±8 K/GPa was determined. This value is consistent with pressure coefficients obtained with other experimental techniques.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 4; 389-392
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Birefringent and Dielectric Properties of [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$ZnBr$\text{}_{4}$ and [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$CdBr$\text{}_{4}$ Crystals
    Autorzy:
    Sveleba, S.
    Mokryi, V.
    Polovinko, I.
    Kapustyanik, V.
    Trybuła, Z.
    Petrenko, P.
    Kiosse, G.
    Kravtsov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929349.pdf
    Data publikacji:
    1993-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.22.Ch
    77.22.-d
    78.20.Fm
    64.70.-p
    Opis:
    Dielectric and birefringent properties of [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$ZnBr$\text{}_{4}$ and [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$CdBr$\text{}_{4}$ crystals were investigated. It has been ascertained that two phase transitions manifest themselves in the temperature dependencies є(T) for [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$CdBr$\text{}_{4}$ crystal - a second-order transition at T$\text{}_{1}$ = 311 K and a first-order one - at T$\text{}_{2}$ = 39 K (∆T$\text{}_{2}$ = 11 K). Besides two earlier known phase transitions in [N(C$\text{}_{2}$H$\text{}_{5}$)$\text{}_{4}$]$\text{}_{2}$ZnBr$\text{}_{4}$ at T$\text{}_{1}$ = 350 K and T$\text{}_{2}^{c\o\ol}$ = 282.8 K (∆T$\text{}_{2}$ ≈ 2.3 K), the additional one was found at T*$\text{}_{2}$ = 287.0 K, both on the cooling and heating runs. On the basis of the data about the peculiarities of dielectric and optical properties in the vicinity of T$\text{}_{2}$ one can made the conclusion about the ferroelectric character of the phase, situated between T*$\text{}_{2}$ and T$\text{}_{2}^{c\o\ol}$.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 6; 777-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Local Order in KTaO$\text{}_{3}$ Admixtured by the Ions of Li$\text{}^{+}$
    Autorzy:
    Kaszyńska, K.
    Trybuła, Z.
    Glinchuk, M. D.
    Bykov, I. P.
    Laguta, V. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043642.pdf
    Data publikacji:
    2005-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    36.40.Ei
    77.22.Gm
    74.72.-h
    74.76.Bz
    Opis:
    The low temperature behavior of the KTaO$\text{}_{3}$ type incipient ferroelectric crystals is of constant interest. The quantum fluctuations reduce the transition to the ferroelectric state in these crystals. It is possible that the small amount of the dopant Li$\text{}^{+}$ can lead, through the elastic interactions, to local glass-like short-range order or even to the relaxor ferroelectric order for x>2.6%. We presented that the low lithium doped x=0.005 KTaO$\text{}_{3}$ crystals exhibit the dielectric dispersion ofε andε", suggesting the glass-like behavior in the low temperature range.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 2; 379-383
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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