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Wyświetlanie 1-15 z 44
Tytuł:
Domain Structure and Birefringence in Pyridinium Perchlorate and Pyridinium Fluoroborate Single Crystal
Autorzy:
Kosturek, B.
Czapla, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2038380.pdf
Data publikacji:
2004-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
Pyridinium perchlorate and pyridinium fluoroborate were grown and their successive phase transitions were studied by means of polarized microscopic observations and measurements of linear birefringence temperature changes. The microscopic observations revealed domain structure appearance at 245 K and 238.7 K for pyridinium perchlorate and pyridinium fluoroborate, respectively. This domain structure exists also in lower phases. Birefringence measurements confirmed two first-order phase transitions at 245.3 K and 231.5 K for pyridinium perchlorate and two continuous phase transitions at 238.7 K and 205.4 K for pyridinium fluoroborate.
Źródło:
Acta Physica Polonica A; 2004, 106, 4; 529-534
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Defects on Ferroelastic Phase Transition in InI Single Crystals
Autorzy:
Kolinko, M. I.
Kityk, I. V.
Kozhljuk, A. B.
Powiązania:
https://bibliotekanauki.pl/articles/1929821.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The influence of the defect subsystem on the behaviour of the structural incommensurate phase in InI single crystals was investigated. The correlation between the incommensurate parameter ζ and the piezooptical π$\text{}_{2222}$ tensor component was revealed.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1065-1069
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pyroelectric and Dilatometric Studies on the Low Temperature Ferroelectric Phase Transition of (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Br$\text{}_{11}$
Autorzy:
Dziedzic, J.
Mróz, J.
Jakubas, R.
Powiązania:
https://bibliotekanauki.pl/articles/2043695.pdf
Data publikacji:
2005-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The results of the linear thermal expansion studies on (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Br$\text{}_{11}$ single crystals in the temperature range 60-340 K are presented. The thermal anomaly in the vicinity of 77 K is assigned to the phase transition classified as close to first order type. The pyroelectric measurements of (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Br$\text{}_{11}$ were carried out in the range of 45-320 K along the a- and c-axis. The step-like change in the spontaneous polarization along the a-axis at 77 K indicates a discontinuous character of ferroelectric transition.
Źródło:
Acta Physica Polonica A; 2005, 108, 3; 505-511
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Dispersion Studies in (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Ga(SO$\text{}_{4}$)$\text{}_{2}$ - 6H$\text{}_{2}$O(DMAGaS) Crystal
Autorzy:
Czapla, Z.
Tchukvinskyi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1968862.pdf
Data publikacji:
1998-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The paper presents the new data of dielectric dispersion in DMAGaS crystal. The very pronounced dispersion above T$\text{}_{c1}$ =136 K is observed in the frequency range 100 Hz-30 MHz with a single relaxation process. The relaxation time τ of an electric dipole reaches 2.17×10$\text{}^{-7}$ s at the T$\text{}_{c1}$. The activation free energy ΔF of the dipoles is estimated to be equal to 0.087 eV. The order-disorder type of phase transition is confirmed.
Źródło:
Acta Physica Polonica A; 1998, 93, 3; 527-530
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaos near Structural Phase Transition
Autorzy:
Beige, H.
Diestelhorst, M.
Forster, R.
Albers, J.
Petersson, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920580.pdf
Data publikacji:
1992-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The studies of nonlinear dynamical dielectric properties of TGS which exhibits chaotic behaviour have been presented. The recorded phase portraits obtained from experiment are compared with the calculations based on different assumptions using a computer.
Źródło:
Acta Physica Polonica A; 1992, 81, 3; 413-418
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Mechanical Stress on the Birefringence Properties of (N(CH$\text{}_{3}$)$\text{}_{4}$)$\text{}_{2}$ZnCl$\text{}_{4}$ Crystals
Autorzy:
Polovinko, I.
Sveleba, S.
Vlokh, O.
Zhmurko, V.
Powiązania:
https://bibliotekanauki.pl/articles/1920539.pdf
Data publikacji:
1992-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The influence of applied mechanical stress on the birefringence of (N(CH$\text{}_{3}$)$\text{}_{4}$)$\text{}_{2}$ZnCl$\text{}_{4}$ crystal in the temperature region of its incommensurate phase was investigated using Senarmonth's method (λ = 633 nm). The value of pinning force for the samples with different defectiveness was experimentally determined.
Źródło:
Acta Physica Polonica A; 1992, 81, 3; 409-412
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of NaNH$\text{}_{4}$SO$\text{}_{4}$·2H$\text{}_{2}$O-NaNH$\text{}_{4}$SeO$\text{}_{4}$·2H$\text{}_{2}$O Mixed Crystals Mixed Crystals
Autorzy:
Czupiński, O.
Mróz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929833.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The mixed crystals of NaNH$\text{}_{4}$SO$\text{}_{4}$·2H$\text{}_{2}$O-NaNH$\text{}_{4}$SeO$\text{}_{4}$·2H$\text{}_{2}$O were grown and their properties were investigated. Dielectric and differential thermal analysis studies allowed us to construct the phase diagram of the system with molar fraction, x, of NaNH$\text{}_{4}$SeO$\text{}_{4}$·2H$\text{}_{2}$O as a parameter. Nonlinear dependence of T$\text{}_{c}$ versus composition was found.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1125-1130
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Investigation of Glycine Phosphite Crystal
Autorzy:
Czukwinski, R.
Czapla, Z.
Styrkowiec, R.
Powiązania:
https://bibliotekanauki.pl/articles/2029273.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
The complementary measurements of the dielectric dispersion in ferroelectric phase of glycine phosphite crystal at the frequency range of 200 Hz - 1 MHz have been carried out. The analysis of the dielectric spectra of the low frequency relaxation process showed that it can be fitted by two Debye-type relaxators. The activation energy of the both processes has been calculated. The observed behaviour of the relaxators suggests that they are connected with a domain structure; one with the growth of the nuclei whereas the second with the domain wall movement.
Źródło:
Acta Physica Polonica A; 2001, 100, 6; 897-903
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous Pyroelectric and Dilatometric Studies of Phase Transitions in Triglycine Sulphate and Glycine Posphite Crystals
Autorzy:
Andriyevsky, B.
Kardash, V.
Dacko, S.
Czapla, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2027373.pdf
Data publikacji:
2001-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
Temperature dependences of the linear dimension L(T) and spontaneous polarization P$\text{}_{s}$(T) for triglycine sulphate and glycine posphite single crystals have been measured in the same run of temperature. A decrease in the spontaneous electrostriction coefficient Q$\text{}_{L}$ of both crystals studied is displayed when approaching the corresponding phase transition point T$\text{}_{c}$. A temperature dependence of the coefficients Q$\text{}_{L}$(T) shows that the rates of temperature changes of displacement of the atomic complexes of corresponding crystal structure forming the square of spontaneous polarization P_s$\text{}^{2}$ (primary order parameter) and the displacements of all atomic complexes forming the spontaneous linear thermal expansionδ L$\text{}_{s}$/L (secondary order parameter) are different. The applying external electric field E=3×10 $\text{}^{5}$ V/m to triglycine sulphate crystal does not influence essentially the temperature dependence of Q$\text{}_{L}$(T) in the temperature range of phase transition below T$\text{}_{c}$.
Źródło:
Acta Physica Polonica A; 2001, 99, 5; 593-600
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Dispersion in Ferroelectric Glycine Phosphite
Autorzy:
Tchukvinskyi, R.
Czapla, Z.
Sobiestianskas, R.
Brilingas, A.
Grigas, J.
Baran, J.
Powiązania:
https://bibliotekanauki.pl/articles/1968490.pdf
Data publikacji:
1997-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
Dielectric dispersion in ferroelectric hydrogen bonded glicyne phosphite crystal was investigated in the frequency range 100 Hz - 27 GHz. Dielectric relaxation of Debye type observed in the paraelectric phase shows a critical slowing down of the polarization fluctuations. The relaxation frequency decreases with temperature according to f$\text{}_{s}$ = 0.305(T-T$\text{}_{0}$) GHz in the paraelectric phase. The activation energy for flipping dipole motion ΔU = 2.07kT$\text{}_{c}$ confirms order-disorder character of the phase transition. In the ferroelectric phase pronounced low frequency (100 Hz - 1 MHz) dispersion related to domain contribution to permittivity was found.
Źródło:
Acta Physica Polonica A; 1997, 92, 6; 1191-1196
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Phase Transitions in Cs$\text{}_{2}$CdBr$\text{}_{4}$: Dielectric, Dilatometric and Optical Studies
Autorzy:
Dacko, S.
Czapla, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2035738.pdf
Data publikacji:
2003-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
Dielectric, dilatometric measurement and polarized microscopic observation were performed for single crystal of Cs$\text{}_{2}$CdBr$\text{}_{4}$. These investigations showed clearly the phase transitions at 252 K, 236 K and 153 K. The jump-like change of the crystal volume corresponding to the first-order phase transition was found at temperature of 236 K. Ferroelastic domain structure was observed along the a-axis below 236 K and it is preserved below the transition at 153 K. Observation along the c-axis revealed new domain structure below 153 K.
Źródło:
Acta Physica Polonica A; 2003, 103, 4; 387-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterization of Ferroelectric Phase Transition in Deuterated Glycine Phosphite Crystal
Autorzy:
Furtak, J.
Dacko, S.
Czapla, Z.
Powiązania:
https://bibliotekanauki.pl/articles/2036879.pdf
Data publikacji:
2003-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
Opis:
Dielectric, dilatometric, and ultrasonic studies around the ferroelectric phase transition at 319 K were done. Measurement of relative electric permittivity showed the existence of a strong bias field which causes in studied samples some diffused character of phase transition. However, all presented measurement confirmed the continuous character of phase transition. The obtained data are similar to those received earlier in the case of hydrogenated glycine phosphite crystal.
Źródło:
Acta Physica Polonica A; 2003, 104, 1; 67-72
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:
Effect of Uniaxial Pressure on the Ferroelectric Phase Transition in Pb$\text{}_{5}$Ge$\text{}_{3}$O$\text{}_{11}$:Ba Crystals
Autorzy:
Molak, A.
Koralewski, M.
Saunders, G. A.
Juszczyk, W.
Powiązania:
https://bibliotekanauki.pl/articles/2043697.pdf
Data publikacji:
2005-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.80.Bh
77.84.Bw
Opis:
The effect of uniaxial pressure up to 1 kbar applied perpendicular and parallel to c-axis, on the Curie temperature and electric permittivityε$\text{}_{c}$ of Ba-doped Pb$\text{}_{5}$Ge$\text{}_{3}$O$\text{}_{11}$ single crystals was investigated. The Curie temperature decreases with uniaxial pressure and the coefficientγ$\text{}_{i}$ (γ$\text{}_{i}$ ≡ δ T$\text{}_{c}$/δ X$\text{}_{i}$) is determined as -7 and -11 K kbar$\text{}^{-1}$ for the b- and c-axes, respectively. It was found that uniaxial pressure increases the phase transition diffuseness and the tricritical point cannot be achieved for this pyroelectric and ferroelectric single crystal.
Źródło:
Acta Physica Polonica A; 2005, 108, 3; 513-520
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 44

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