Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "77.80.-e" wg kryterium: Temat


Tytuł:
Behaviour of Isotropic Point in LiKSO$\text{}_{4}$ Crystals
Autorzy:
Stadnyk, V. J.
Romanyuk, M. O.
Vachulovich, V. F.
Powiązania:
https://bibliotekanauki.pl/articles/1929182.pdf
Data publikacji:
1993-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
Opis:
The temperature-spectral dependencies of refractive indices and birefringence in wide temperature (77-1000 K) and spectral (250-850 nm) regions in LiKSO$\text{}_{4}$ crystals were measured. The isotropic point of LiKSO$\text{}_{4}$ crystals was investigated. It was shown that annealing and X-ray irradiation display insignificantly the isotropic point to a visible region of spectrum.
Źródło:
Acta Physica Polonica A; 1993, 83, 4; 469-475
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Optical Activity of Ferroelectric Lead Germanate
Autorzy:
Vlokh, O. G.
Kushnir, O. S.
Shopa, Y. I.
Powiązania:
https://bibliotekanauki.pl/articles/1920668.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
Opis:
A new optical method for measuring the optical activity of crystals is developed. Temperature dependence of gyration component g$\text{}_{11}$ of ferroelectric lead germanate is measured. The obtained results confirm that lead germanate may be considered as a gyroelectric crystal.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 571-578
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Pressure Microwave Study of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$-Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$ Composite
Autorzy:
Czyżak, B.
Stankowski, J.
Hilczer, B.
Krupski, M.
Morawski, P.
Andrzejewski, B.
Marfaing, J.
Régnier, S.
Caranoni, C.
Powiązania:
https://bibliotekanauki.pl/articles/1964222.pdf
Data publikacji:
1997-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
Opis:
The ferroelectric relaxor Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$-superconductor YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ 50% in weight composite exhibits the onset critical temperature T$\text{}_{c}$=95 K. High pressure studies yield the factor dT$\text{}_{c}$/dp of 1.0 K/GPa, close to the value observed for a pure YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ compound. The microwave absorption studies show the significant role of the intergrain weak links.
Źródło:
Acta Physica Polonica A; 1997, 91, 6; 1103-1109
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model of Temperature Dependence of Spontaneous Polarization of Thiourea Monocrystal in Phase I
Autorzy:
Śliwa, I.
Wanarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1419853.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
77.80.-e
Opis:
In this paper we present a model of spontaneous polarization appearing in the crystal of thiourea in phase I, constructed on the basis of the molecular field theory, with the use of the Boltzmann statistics. The model employs the potential energy of interaction between two nonpunctual molecular electric dipoles performing reorientations within the constraints specified by the experimentally determined structural data. The temperature dependences of the spontaneous polarization for different values of the hydrostatic pressure and for different γ-ray doses were obtained. A comparison between theoretical and experimental results permitted calculation of the parameters of the theory presented.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 184-189
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Model of Ferroelectricity in Thiourea
Autorzy:
Śliwa, I.
Wanarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1493663.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
77.80.Bh
Opis:
In this paper we propose a mechanism of the phenomenon of ferroelectricity in the molecular crystal of thiourea $(SC(NH_2)_2)$. The mechanism is based on the model of interaction between two molecular electric dipoles. The dipoles are not idealized to points - they have a finite length. Besides, they can reorient mutually and the reorientation is determined by the crystal structure specified by the experimental structural research. On the basis of this theory, a formula for the potential energy of interaction of a pair of two nonpunctual dipoles as a function of the angle of reorientation is derived and discussed.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 516-520
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Terahertz Spectroscopy of Ordered $PbSc_{1//2}Nb_{1//2}O_3$ Ceramics
Autorzy:
Macutkevič, J.
Adomavičius, R.
Krotkus, A.
Valušis, G.
Grigalaitis, R.
Banys, J.
Bormanis, K.
Sternberg, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813210.pdf
Data publikacji:
2008-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Gm
77.80.-e
77.80.Bh
Opis:
The ordered $PbSc_{1//2}Nb_{1//2}O_3$ ceramics were studied by THz transmission spectroscopy in the temperature range of 80-300 K. Below ferroelectric phase transition temperature the strength of central mode gradually decreases and gives evidence for a mixed displacive and order-disorder character of the transitions. Ferroelectric phase transition is connected with an abrupt freezing and rise of polar nanoregions into ferroelectric domains.
Źródło:
Acta Physica Polonica A; 2008, 113, 3; 883-886
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Positive Temperature Coefficient of Resistivity Effect in the $Pb(Fe_{1//2}Nb_{1//2})O_{3}$ Ceramics Admixed with Lithium
Autorzy:
Bochenek, D.
Powiązania:
https://bibliotekanauki.pl/articles/1795785.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
77.80.Bh
77.22.Gm
Opis:
In the paper technological conditions were looked for to obtain the $Pb(Fe_{1//2}Nb_{1//2})O_{3} (PFN) ceramics and the PFN ceramics with the lithium admixture with the highest electric conduction and conditions appropriate for the PTC-R effect formation. Measurements of dc electrical resistivity, dielectric permittivity and dielectric loss were made as functions of temperature from room temperature to 190°C, at 1 kHz. The best set of values of dielectric loss and dielectric constant, from the ferroelectricity point of view, were obtained when the precursor with orthorhombic structure was employed. By creating appropriate technological conditions in the PFN ceramics the PTC-R effect can occur above the Curie temperature. Their electric properties are determined by presence of a basic phase of the potential barrier on the grain boundaries.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 268-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and Simulation of a Photovoltaic Module in Different Operating Regimes
Autorzy:
Jadallah, A.
Mahmood, D.
Abdulqader, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1402513.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
77.80.-e
Opis:
Modern research focuses on the renewable energy sources such as solar energy. This paper presents the modeling and performance of a photovoltaic (PV) cell. A simulation code is built using MATLAB. Results show that the increase of solar radiation and of ideality factor of diode lead to an increase in the output power of PV module, while the increease of cell temperature and of the dark saturation current lead to a decrease of the power. Curves of I-V and P-V dependencies are presented for module having 50 branches connected in parallel, with each branch having 50 cells connected in series. Data for certain Iraqi governorates are taken and applied for proposed module.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-461-B-464
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Field Relaxational Behavior of Taap Single Crystal (20-10$\text{}^{6}$ Hz)
Autorzy:
Fernández del Castillo, J. R.
Iglesias, T.
Przesławski, J.
Gonzalo, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/1968856.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.Fr
77.80.-e
Opis:
Relaxational behavior of ferroelectric telluric acid ammonium phosphate crystals were investigated in the range 20 Hz to 1 MHz by means of low field measurements of ε' and tan δ in the vicinity of ferroelectric phase transitions at a number of frequencies. Results are compared with those for triglycine selenate, a much "softer" ferroelectric material. The measuring field and frequency dependence of the effective potential barrier height for domain wall motion are compared in both crystals.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 499-503
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Transformations and Magnetic Changes in Multiferroic BiFeO₃ under External Electric Field
Autorzy:
Soloviov, S.
Popkov, A.
Kulagin, N.
Sukmanova, K.
Zvezdin, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385072.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.85.+t
77.80.-e
Opis:
The influence of electric field on the structure parameters and magnetic states in BiFeO₃ multiferroic is studied using the Landau theory of phase transitions taking into account experimental data and results of ab initio calculations. Main features of structure transitions near critical electric fields and a concomitant rearrangementof the magnetic structure are discussed.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 245-247
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Study of Fe$\text{}^{3+}$ Paramagnetic Centers in Doped Triglycine Sulphate Crystals
Autorzy:
Łoś, Sz.
Trybuła, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2030426.pdf
Data publikacji:
2002-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
77.80.-e
Opis:
This paper presents EPR study of Fe$\text{}^{3+}$ in triglycine sulphate doped with Fe$\text{}^{3+}$ crystal. Fe$\text{}^{3 +}$ ion is in a high spin state S=5/2. EPR signal can be detected only below 200 K. At 4.2 K the EPR spectrum results from three non-equivalent sites of Fe$\text{}^{3+}$ ions. The spin Hamiltonian: H=β BĝS+D[S$\text{}_{z}^{2}$-(1/3)S(S+1)]+E(S$\text{}_{x}^{2}$-S$\text{}_{y}^{2}$) has been applied to describe the spectrum. The zero field splitting parameter in this case fulfills the condition: D≫hν. An experimental spectrum reflects clearly only two resonance transitions: |±1/2ã (the lowest Kramers doublet) and |±3/2〉 (the middle Kramers doublet). The iron complexes occupy interstitial positions in the crystal with distorted octahedral or tetrahedral co-ordination.
Źródło:
Acta Physica Polonica A; 2002, 101, 2; 279-287
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobility of Ferroelectric Domains in Antimony Sulfoiodide
Autorzy:
Toroń, B.
Nowak, M.
Kępińska, M.
Szperlich, P.
Powiązania:
https://bibliotekanauki.pl/articles/1376000.pdf
Data publikacji:
2014-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
77.80.Dj
77.80.B-
81.05.Hd
Opis:
Different optical energy gaps in ferroelectric and paraelectric phases as well as light scattering on domain walls allow to observe ferroelectric domains in antimony sulfoiodide (SbSI) near the Curie temperature. Mobility 8.11(44)× $10^{-8}$ $m^2$/(Vs) of ferroelectric domain walls under external electric field has been determined along c-axis of SbSI single crystals using optical transmittance microscopy.
Źródło:
Acta Physica Polonica A; 2014, 126, 5; 1093-1095
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibronic Magnetoelectric Effects in the Bi-Based Multiferroics
Autorzy:
Konsin, P.
Sorkin, B.
Powiązania:
https://bibliotekanauki.pl/articles/1384870.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.kd
77.84.-s
77.80.Bh
77.80.-e
Opis:
The detailed magneto-electron-lattice (vibronic) theory of ferroelectricity in the Bi-based multiferroics (BiFeO₃ etc.) is developed further. The vibronic admixture of the empty oxygen 2p states to the Bi 6s lone electron pair state leads to ferroelectricity. These interactions are the driving and restoring forces of the structural phase transformations of the Bi-based multiferroics. The free energy of the BiFeO₃-type multiferroics with the ferroelectric and the G-type antiferromagnetic phase transitions are derived. The Zeeman splitting and spin-transversal optical phonon couplings are also important.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 243-244
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Influence of the Synthesis Conditions οn the PFN Ceramics Properties
Autorzy:
Bochenek, D.
Surowiak, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1795786.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
68.37.Hk
77.80.Bh
77.22.Gm
Opis:
In the work tests of the influence of the technological conditions on the basic applied properties of the $Pb(Fe_{0.5}Nb_{0.5})O_3$ ceramics were carried out. The $Pb(Fe_{0.5}Nb_{0.5})O_3$ specimens were obtained by a two-stage method of synthesizing (the niobite method), a technique of the powder mixture calcinations, changing a temperature range of the iron-niobate $(FeNbO_{4})$, whereas compacting was conducted by free sintering.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 271-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferroelectromagnetic Smart Structures $(1-x)Pb(Fe_{0.5}Nb_{0.5})O_{3}-(x)BiFeO_{3}$
Autorzy:
Bochenek, D.
Zachariasz, R.
Ilczuk, J.
Dudek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1795787.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.-e
68.37.Hk
77.80.Bh
77.22.Gm
Opis:
In this work an attempt was made to obtain three compositions of the solid solution $(1-x)Pb(Fe_{0.5}Nb_{0.5})O_{3}-(x)BiFeO_{3}$ for x=0.8, 0.7 and 0.6. The obtained specimens were subjected to microstructure and dielectric examinations and temperature dependences of the internal friction $Q^{-1}(T)$ and Young's modulus E(T).
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 274-276
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies