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Wyświetlanie 1-15 z 29
Tytuł:
Quadrupole Relaxation of $\text{}^{79}$Br Nuclei in Ferroelectric (CH$\text{}_{3}$)$\text{}_{4}$NCdBr$\text{}_{3}$ (TMCB)
Autorzy:
Baisa, D. F.
Chesnokov, E. D.
Czapla, Ż.
Powiązania:
https://bibliotekanauki.pl/articles/1931611.pdf
Data publikacji:
1994-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
Investigations of temperature dependence of a nuclear quadrupole spin-lattice relaxation time of $\text{}^{79}$Br nuclei in ferroelectric (CH$\text{}_{3}$)$\text{}_{4}$NCdBr$\text{}_{3}$ are presented. It is shown that in paraelectric phase in the vicinity of phase transition temperature relaxation process is determined by critical fluctuations of electric field gradient. In ferroelectric phase relaxation is related to three different mechanisms, namely: lattice vibrations, CH$\text{}_{3¯}$ group reorientations and TMA cation motions. According to the results of measurements it is concluded that the phase transition is connected with ordering of TMA cations.
Źródło:
Acta Physica Polonica A; 1994, 86, 3; 357-361
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Permittivity in the Triglicinium Sulphate Crystals Doped with Chromium Ions as a Function of Temperature and Electric Field
Autorzy:
Dziedzic, J.
Powiązania:
https://bibliotekanauki.pl/articles/2014251.pdf
Data publikacji:
2000-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
Permittivity in the triglicinium sulphate crystals doped with chromium ions Cr$\text{}^{3+}$ as a function of temperature and of intensity of electric field polarising the crystal was investigated. On the base of thermodynamical theory, the relationship among permittivity, temperature and electric field intensity was calculated. Coefficients of the expansion of the thermodynamic potential were determined. Experimental results were compared with those resulting from the thermodynamical theory.
Źródło:
Acta Physica Polonica A; 2000, 98, 4; 373-381
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ferroelectric Phase Transition in DC Electric Field in [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ Crystals
Autorzy:
Dziedzic, J.
Mróz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2047351.pdf
Data publikacji:
2007-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
Dielectric investigations of ferro-paraelectric phase transition under influence of bias pooling DC electric field ranging from 0 to 500 kV/m were performed for [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$. The linear shift of T$\text{}_{c}$ towards higher temperatures was observed. The A$\text{}_{0}$ and B coefficients from the Landau state equation are determined.
Źródło:
Acta Physica Polonica A; 2007, 111, 6; 873-876
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dielectric Properties of the (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2(1- x)}$Sb$\text{}_{2x}$Cl$\text{}_{11}$ Mixed Crystals
Autorzy:
Mróz, J.
Dziedzic, J.
Pykacz, H.
Powiązania:
https://bibliotekanauki.pl/articles/2047087.pdf
Data publikacji:
2006-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
The (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2(1-x)}$Sb$\text{}_{2x}$Cl$\text{}_{11}$ crystals were examined from the point of view of their applicability in pyroelectric detectors. It was shown that they can be useful so far as the construction of infrared detectors is concerned due to high values of both their pyroelectric coefficient and figure of merit p/sqrtε which are both comparable with those of triglycine sulphate crystals.
Źródło:
Acta Physica Polonica A; 2006, 110, 4; 479-483
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Quadrupole Resonance Investigation of Phase Transition in Tetramethylammonium Cadmium Tribromide
Autorzy:
Baisa, D. F.
Chesnokov, E. D.
Czapla, Z. V.
Pogrebnyak, S.
Vertegel, I. G.
Powiązania:
https://bibliotekanauki.pl/articles/1929552.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
The critical temperature dependence of the nuclear quadrupole- resonance $\text{}^{79}$Br frequencies at the phase transition (T$\text{}_{c}$ = 163 K) was found in (CH$\text{}_{3}$)$\text{}_{4}$NCdBr$\text{}_{3}$. It was concluded that bromine nuclei take part in the phase transition not directly but via the interaction with the crystal polarization.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 271-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies of Elastic Waves Propagation in Triglycine Sulphate Crystals Doped with Chromium Ions
Autorzy:
Dziedzic, J.
Powiązania:
https://bibliotekanauki.pl/articles/2029264.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
Velocities and scattering of transverse elastic wave propagating in the triglycine sulphate crystal doped with the Cr$\text{}^{3+}$ ions as a function of temperature and electric field which polarises the crystal were examined. Temperature dependencies of modulus of elasticity S$\text{}_{55}$ and modulus of rigidity C$\text{}_{55}$ as a function of temperature and an electric field were determined. The results were analysed and discussed.
Źródło:
Acta Physica Polonica A; 2001, 100, 6; 879-884
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Spontaneous Polarisation and Pyroelectric Modulus for the Triglycine Sulphate Crystals Doped by Chromium Ions
Autorzy:
Dziedzic, J.
Stolecki, B.
Powiązania:
https://bibliotekanauki.pl/articles/2014061.pdf
Data publikacji:
2000-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
The temperature dependencies of a spontaneous polarisation, P$\text{}_{s}$, and pyroelectric modulus, γ, at different electric field intensities were investigated for the triglycine sulphate crystals doped with the Cr$\text{}^{3+}$ chromium ions. On the base of thermodynamic theory the temperature dependencies of P$\text{}_{s}$ and γ at different electric field intensities were estimated. The coefficients of the expansion of the thermodynamic potential were determined. The experimental results were compared with those obtained according to the thermodynamic theory.
Źródło:
Acta Physica Polonica A; 2000, 98, 1-2; 55-60
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Pyroelectric Properties of the TGS-TGSe Crystals with Internal Electric Field
Autorzy:
Dziedzic, J.
Mróz, J.
Powiązania:
https://bibliotekanauki.pl/articles/2044565.pdf
Data publikacji:
2005-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
Opis:
Measurements of spontaneous polarization and pyroelectric coefficient versus temperature and electric field were performed for the TGS-TGSe crystals at a definite internal electric field. The obtained results are compared with the thermodynamic theory predictions. The temperature and electric field dependencies of pyroelectric coefficient are presented together with its maximal value as a function of the electric field intensity. It was shown that the temperature, at which the pyroelectric coefficient reaches its maximal value, depends on the external electric field.
Źródło:
Acta Physica Polonica A; 2005, 108, 6; 971-978
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatomelric and Pyroelectric Study of Phase Transition in (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$ · 6H$\text{}_{2}$O Ferroelectric Crystal
Autorzy:
Pykacz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1943935.pdf
Data publikacji:
1995-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
65.70.+y
Opis:
The results of linear thermal expansion and pyroelectric coefficient are given for crystal of dimethylammoniumaluminium sulphate hexahydrate. Large anomalies of these quantities has been observed around the phase transition temperature at 151 K.
Źródło:
Acta Physica Polonica A; 1995, 88, 6; 1097-1101
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Expansion of (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$X$\text{}_{11}$ (X=Cl, Br) Crystals in the Temperature Range from 80 to 300 K
Autorzy:
Jakubas, R.
Franqois, P.
Lefebvre, J.
Powiązania:
https://bibliotekanauki.pl/articles/1930930.pdf
Data publikacji:
1994-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
65.70.+y
Opis:
Thermal expansion studies on (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$\text{}_{11}$ in the temperature range 80-350 K are reported. The dilatometric measurements revealed a considerable similarity with respect to the anisotropy of dilatations of both isomorphous crystals. A diffused thermal anomaly was found around 170 K in (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Cl$\text{}_{11}$ crystal.
Źródło:
Acta Physica Polonica A; 1994, 85, 3; 579-583
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatometric Study of the Phase Transition in (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Cl$\text{}_{11}$
Autorzy:
Pykacz, H.
Jakubas, R.
Powiązania:
https://bibliotekanauki.pl/articles/1887544.pdf
Data publikacji:
1991-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
65.70.+y
Opis:
The paper reports a dilatometric study on (CH$\text{}_{3}$NH$\text{}_{3}$)$\text{}_{5}$Bi$\text{}_{2}$Cl$\text{}_{11}$ single crystals. It is shown that elongation of the crystal is continuous but linear thermal expansion coefficients are discontinuous at phase transition temperature.
Źródło:
Acta Physica Polonica A; 1991, 79, 5; 695-697
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Linear Birefringence Changes in Betaine Phosphite Crystal
Autorzy:
Kosturek, B.
Przesławski, J.
Czapla, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1929341.pdf
Data publikacji:
1993-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
78.20.Fm
Opis:
Linear birefringence temperature changes are measured in the betaine phoshite crystal. The linear birefringence increments induced by antiferrodistortive, structural and ferroelectric phase transitions are analysed. Temperature derivatives of the linear birefringences are shown for comparison. Critical exponents are determined for both transitions. The antiferrodistortive phase transition is close to a tricritical one.
Źródło:
Acta Physica Polonica A; 1993, 83, 6; 769-775
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monotropic Character of Polymorphism in Pentachloropyridine Crystal Studied by Calorimetric and Spectroscopic Methods
Autorzy:
Wójcik, G.
Giermańsκa-Kahn, J.
Marqueton, Y.
Foulon, M.
Powiązania:
https://bibliotekanauki.pl/articles/1933583.pdf
Data publikacji:
1995-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
78.30.-j
Opis:
Pentachloropyridine crystals in two polymorphic modifications: tetragonal and monoclinic were studied by differential scanning calorimetry and polarized IR and Raman spectroscopy in 20 to 200 cm$\text{}^{-1}$ region and at different temperatures from melting point down to the liquid nitrogen temperature. The 4 K difference in melting points of both forms indicates the occurrence of monotropy. The spectra were discussed in terms of positional disorder in the studied crystals which often happen to be mixtures of the monoclinic crystal and the L- and D-forms of the tetragonal one. The monotropic transition of the metastable tetragonal crystal into the stable monoclinic one was observed in the Raman spectra and under the polarizing microscope at temperatures ranging from 170 to 185 K and as an anomaly on the differential scanning calorymetry diagram at 193 K.
Źródło:
Acta Physica Polonica A; 1995, 88, 2; 339-347
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Dilatometric Properties of (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O Crystals in Paraelectric and Ferroelectric Phases
Autorzy:
Podsiadła, D.
Czapla, Z.
Andriyevsky, B.
Myshchyshyn, O.
Powiązania:
https://bibliotekanauki.pl/articles/2011078.pdf
Data publikacji:
1999-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
78.20.Fm
Opis:
Experimental investigation of the thermal linear expansion l(T) and temperature dependencies of the interference optical path difference D(T) were carried out for (CH$\text{}_{3}$)$\text{}_{2}$ NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O crystal, in the range of 120-310 K for three crystal physical directions. Decrease in electrostriction coefficients g of crystal was observed on approaching the phase transition point T$\text{}_{c}$ ≈ 150 K in ferroelectric phase. Relative temperature changes of the lengthening δl/l and refractive index δn/(n-1) are of the same order of magnitude. Peculiarities of temperature dependence of dilatometric and optical parameters of (CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$Al(SO$\text{}_{4}$)$\text{}_{2}$·6H$\text{}_{2}$O testify for qualitative reconstruction of chemical bonds in the crystal when temperature changes in the same phase.
Źródło:
Acta Physica Polonica A; 1999, 96, 3-4; 409-416
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical Investigations of Phase Transitions in (NH$\text{}_{4}$)$\text{}_{2}$SbF$\text{}_{5}$ Crystal
Autorzy:
Andriyevsky, B.
Czapla, Z.
Stadnyk, V.
Powiązania:
https://bibliotekanauki.pl/articles/1932114.pdf
Data publikacji:
1995-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.70.Kb
78.20.Fm
Opis:
Results of optical thickness and refractive indices measurements for (NH$\text{}_{4}$)$\text{}_{2}$SbF$\text{}_{5}$ crystal in the temperature range 100-310 K are presented. The measurements were done with interference method using He-Ne laser (λ = 632.8 nm). At T$\text{}_{c1}$ = 292 K and T$\text{}_{C2}$ = 168 K two continuous phase transitions with critical indices β$\text{}_{1}$ = 0.38 and β$\text{}_{2}$ ≤ 0.57 were observed. Additional anomaly of temperature changes of interference order with maximum at T$\text{}_{c3}$ ≈ 132 K were found. This anomaly resembles a diffused transition. Temperature-averaged values of derivatives of refractive indices dn$\text{}_{g}$ /dT = -3.3 × 10$\text{}^{-5}$ K and dn$\text{}_{m}$/dT = -2.9 × 10$\text{}^{-5}$ K$\text{}^{-1}$ evidenced a decrease in optical anisotropy (birefringence) along the b-axis on heating run.
Źródło:
Acta Physica Polonica A; 1995, 87, 3; 611-617
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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