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    Wyświetlanie 1-13 z 13
    Tytuł:
    The Internal Bias Field of Ferroelectric (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Br$\text{}_{11}$
    Autorzy:
    Pykacz, H.
    Mróz, J.
    Jakubas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920778.pdf
    Data publikacji:
    1992-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    Opis:
    Spontaneous polarization of (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Br$\text{}_{11}$ crystals has been measured and the ferroelectric hysteresis loop has been studied. The observed time changes in the polarization have been ascribed to the change in the internal bias field of the crystal. Measurement results have also been discussed for the lower phase transition (T$\text{}_{II}$ = 77 K).
    Źródło:
    Acta Physica Polonica A; 1992, 81, 6; 667-673
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Transitions in (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$X$\text{}_{11}$ (X=Cl, Br) Crystals
    Autorzy:
    Pykacz, H.
    Mróz, J.
    Jakubas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929825.pdf
    Data publikacji:
    1993-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    Opis:
    Electric properties of (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Cl$\text{}_{11}$ and (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Br$\text{}_{11}$ single crystals in the direction of the crystallographic b-axis were studied. The samples tested were natural crystal seeds in the form of thin plates, whose crystallographic b-axis coincides with the normal to the plate. Measurements of the pyroelectric coefficient were performed near the high temperature phase transition and spontaneous polarization from the paraelectric phase down to helium temperature. The attempt of explanation of the anomalous electric properties of these crystals has been presented.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 6; 1085-1091
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Disturbances in a Semi-Infinite Piezoelectric Medium Coated with a Perfectly Conducting Thin Film under the Influence of Time-Dependent Flow of Heat for a Finite Interval
    Autorzy:
    Munshi, T. K.
    Kundu, K. K.
    Mahalanabis, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930956.pdf
    Data publikacji:
    1994-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    Opis:
    An attempt was made to investigate analytically the mechanical behaviour of a semi-infinite piezoelectric medium coated with a perfectly conducting thin film under the influence of time-dependent flow of heat at the finite end. The problem involves the interaction of three fields, viz. electrical, mechanical and thermal, and the solution was obtained with the aid of operational calculus. The resultant displacement consists of a time-dependent, as well as a time-independent part and the variation of displacements exhibits an arc of a parabola.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 3; 585-592
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Defects on Dielectric Properties of (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$X$\text{}_{11}$ (x=Cl, Br) Crystals
    Autorzy:
    Μróz, J.
    Pykacz, H.
    Jakubas, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933587.pdf
    Data publikacji:
    1995-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    Opis:
    Influence of defects on ferroelectric properties of the (CH$\text{}_{3}$ΝΗ$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Χ$\text{}_{11}$ (Χ = Cl, Br) crystals in the vicinity of ferro-paraelectric phase transition was investigated. γ-irradiation of both crystals insignificantly shifts Tc towards higher temperature. The substitution of chlorine atoms by iodine ones in the (CH$\text{}_{3}$ΝΗ$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Cl$\text{}_{11}$ crystal drastically reduces the magnitude of the dielectric permittivity but does not influence on the temperature behaviour of the spontaneous polarization.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 2; 369-374
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pyroelectricity in Non-Central Crystals
    Autorzy:
    Pereverzeva, L. P.
    Poplavko, Yu. M.
    Prokopenko, Yu. V.
    Chepiliko, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929561.pdf
    Data publikacji:
    1993-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    77.80.Bh
    Opis:
    Unit cell electric arrangement of piezoelectric crystals may be described by various multipole/octupole/dipole electric moments which corresponds to a three/two/one-dimensional intrinsic polarity respectively. Such a latent polar structure is totally self-compensated in piezoelectrics if they are mechanically free, but it is non-compensated in pyroelectrics and ferroelectrics. Uniform but anisotropic partial clamping destroys a total self-compensation of non-central crystal intrinsic polarity. This decompensation allows to observe a polar response that is a "dipole projection" ΔP$\text{}_{i}$ from, broken by clamping, spatial polar arrangement of piezoelectrics.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 2; 287-291
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical Response in an N-Electrode Piezo-Quartz Bar under Electrical and Thermal Excitations
    Autorzy:
    Munshi, T. K.
    Kundu, K. K.
    Mahalanabis, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933453.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.65.-j
    77.70.+a
    Opis:
    The mechanical response in an N-electrode piezo-quartz bar where two consecutive electrodes are separated by an unelectroded region has been studied under electrical and thermal excitations. The bar is subjected to a periodic polarization gradient and a constant flow of heat. The method of operational calculus and Green's function has been used to solve the problem. For time scale ranging from 0.1 to 1.0 s the response becomes a linear function of time and is of the order of 10$\text{}^{-8}$ m.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 995-1002
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric and Pyroelectric Studies on [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{3}$Bi$\text{}_{2}$X$\text{}_{9}$ (X = Cl, Br)
    Autorzy:
    Jakubas, R.
    Bator, G.
    Mróz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932184.pdf
    Data publikacji:
    1995-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.80.Dj
    77.70.+a
    77.80.Bh
    Opis:
    Dielectric properties of [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{3}$Bi$\text{}_{2}$X$\text{}_{9}$ (X = Cl, Br) single crystals were measured in the frequency range 1 kHz - 1 MHz in the vicinity of structural phase transitions of first-order type at 152 K (Cl) and 183 K (Br). The pyroelectric effect was observed in [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{3}$Bi$\text{}_{2}$[N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{3}$Bi$\text{}_{2}$Cl$\text{}_{9}$ at structural phase transition (T$\text{}_{c}$ = 152 K) with the ΔP$\text{}_{s}$ of the order of 10$\text{}^{-5}$ C m$\text{}^{-2}$. Polarized microscope observations show appearance of ferroelectric domain structure in [N(CH$\text{}_{3}$)$\text{}_{4}$]$\text{}_{3}$Bi$\text{}_{2}$Br$\text{}_{9}$ within the low temperature phase.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 3; 663-669
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization Induced Effects in AlGaN/GaN Heterostructures
    Autorzy:
    Ambacher, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014138.pdf
    Data publikacji:
    2000-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.84.-s
    77.70.+a
    77.65.Ly
    Opis:
    Two-dimensional hole and electron gases in wurtzite GaN/Al$\text{}_{x}$Ga$\text{}_{1-x}$N/GaN heterostructures areinduced by strong polarization induced effects. The sheet carrier concentration and the confinement of the two-dimensional carrier gases located close to one of the AlGaN/GaN interfaces are sensitive to a high number of different physical properties such as polarity, alloy composition, strain, thickness, and doping. We have investigated the structural quality, the carrier concentration profiles, and electrical transport properties by a combination of high resolution X-ray diffraction, Hall effect, and C-V profiling measurements. The investigated heterostructures with N- and Ga-face polarity were grown by metalorganic vapor phase or plasma induced molecular beam epitaxy covering a broad range of alloy compositions and barrier thickness. By comparison of theoretical and experimental results we demonstrate that the formation of two-dimensional hole and electron gases in GaN/AlGaN/GaN heterostructures both rely on the difference of the polarization between the AlGaN and the GaN layer. In addition the role of polarity on the carrier accumulation at different interfaces in n- and p-doped heterostructures will be discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 3; 195-201
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Hydrogen Bonds in TGS Crystals Observed by Means of Measurements of Pyroelectric Currents Induced by Linear Changes of Temperature
    Autorzy:
    Trybus, M.
    Paszkiewicz, T.
    Woś, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032468.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    77.84.Fa
    77.80.B-
    Opis:
    The study of pyroelectric response of monocrystalline TGS cubic specimens to changes of temperature induced by linear and pulse heating of three mutually perpendicular pairs of cube sides demonstrated a complicated structure of signals. We attribute their forms to the activation of various hydrogen bonds between glycine G1, G2, and G3 molecules. In the case of pulse heating the pyroelectric signal is observed also in the paraelectric phase.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 161-163
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrocaloric Cooling - A New Application of Relaxor Ferroelectrics
    Autorzy:
    Suchaneck, G.
    Gerlach, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031012.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.70.+a
    84.60.Bk
    77.80.Jk
    77.22.Ch
    Opis:
    Until now, relaxor ferroelectrics are considered as a class of disordered materials possessing peculiar structures and properties which are not yet generalized into a universal model explaining the significant amount of experimental data available. In this work, we demonstrate that one feature of relaxor ferroelectrics - the extraordinary dielectric response - is well-suited for application in electrocaloric refrigerators. We consider the electrocaloric effect with special attention to relaxor ferroelectrics, the dielectric response in the temperature region of interest, the efficiency and the figure of merit of relaxor ferroelectrics for electrocaloric application.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1003-1005
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Linear Optic Polarization in Lithium Sulphate Monohydrate Crystals
    Autorzy:
    Czapla, Z.
    Dębska, M.
    Lebedeva, E.
    Pirozerski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2025781.pdf
    Data publikacji:
    2001-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    72.40.+w
    77.70.+a
    77.80.-e
    Opis:
    The "steady-state" non-linear optic polarization arising in lithium sulphate monohydrate crystals under the influence of the short pulse laser irradiation has been investigated in the temperature range of 95-305 K. The reversal of the sign of the components of the generalised non-linear susceptibility tensorχ has been found at about 105 K. The change of the photoresponse kinetics and a drastic temperature dependence of the componentsχ$\text{}_{ijk}$ in the temperature range of 95-105 K, as well as the change of the spectral dependence of the photoresponse were observed.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 5; 539-543
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solid State Polymorphism and Dynamics οf 2,2-Dimethylbutan-1-ol as Studied by Adiabatic Calorimetry and Dielectric Spectroscopy
    Autorzy:
    Juszyńska-Gałązka, E.
    Zieliński, P.
    Massalska-Arodź, M.
    Krawczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399009.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.60.+a
    77.22.Gm
    64.70.P-
    Opis:
    2,2-dimethylbutan-1-ol, known as neohexanol, was studied by adiabatic calorimetry and dielectric spectroscopy. Details of complex solid state polymorphism and relaxational dynamics were identified and described. System of phases of neohexanol was found to be monotropic with three orientationally disordered crystalline phases besides isotropic liquid and ordered crystal. Moreover, two subsequent glass transition anomalies of heat capacity $C_{p}(T)$ were detected on heating in one of the supercooled orientationally disordered crystalline phases. Thermodynamical properties of neohexanol are described in relation to the dielectric relaxation processes found.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 917-925
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Low Temperature Annealing on Microstructural and Optical Properties of $(BaTiO_3)_{0.84}(CeO_2)_{0.16}$ Thin Films
    Autorzy:
    Dughaish, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400390.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    77.55.F-
    78.20.Ci
    78.66.-w
    81.15.-z
    81.40.Ef
    81.70.Fy
    Opis:
    $(BaTiO_3)_{0.84}(CeO_2)_{0.16}$ thin films were prepared by electron beam evaporation method. X-ray diffraction and scanning electron microscopy revealed the amorphous structure for the as-prepared films. The thin films were annealed at temperatures: 200, 300, 400 and 500C for 1 h in air. Small and low intensity crystalline peaks were observed at annealing temperature of 200C for 1 h. The intensity and the number of the crystalline peaks were increased with increasing annealing temperature. Nanocrystals, of dimensions in the range 60-76 nm, were obtained when the annealing was performed at 500°C. The indexed diffraction pattern of the annealed thin film revealed a monoclinic structure. A two-layer model was used to describe the experimental ellipsometric data. The Bruggeman effective medium approximation was used to describe the surface roughness layer and the Cauchy dispersion relation was used to describe the main $(BaTiO_3)_{0.84}(CeO_2)_{0.16}$ layer. The optical constants of the thin films over 300-1100 nm spectral range were measured. The optical band gap showed gradual decrease with the annealing temperature. The accurate determination of the optical constants of the thin films is very useful and should be taken into consideration in the design of devices using optical thin films technology.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 87-91
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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