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Wyświetlanie 1-15 z 34
Tytuł:
The Dielectric Studies of Ferroelectric [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ Crystals under Moderate Pressure
Autorzy:
Zdanowska-Frączek, M.
Olszewski, M.
Frączek, Z. J.
Jakubas, R.
Powiązania:
https://bibliotekanauki.pl/articles/2047740.pdf
Data publikacji:
2007-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.45.Gm
77.84.Fa
77.22.Ch
77.80.Bh
Opis:
The effect of pressure on the dielectric properties of [NH$\text{}_{2}$(CH$\text{}_{3}$)$\text{}_{2}$]$\text{}_{3}$Sb$\text{}_{2}$Cl$\text{}_{9}$ crystal was analyzed for a few values of hydrostatic pressure within the range from 0.1 MPa to 300 MPa and for temperatures from the range of 220-350 K. The measuring frequency was 1 kHz. The pressure-temperature phase diagram obtained was nonlinear. The temperature dielectric permittivity anomalies related to the paraelectric-ferroelectric phase transition temperature (T$\text{}_{c}$) gradually increase up to 66 MPa and then decrease with subsequent increase in pressure. The character of the temperature dielectric permittivity anomalies, typical of the continuous ferroelectric transition, remains unchanged with increasing pressure. Additionally, the pressure dependences of the Curie-Weiss constants for the crystal in paraelectric (C$\text{}_{+}$) and ferroelectric (C$\text{}_{-}$) phases were evaluated and discussed. The results indicated a complex mechanism of the ferroelectric phase transition.
Źródło:
Acta Physica Polonica A; 2007, 112, 3; 549-556
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prenematic Self-Assembling of Mesogenic Molecules in Isotropic Liquid and Orientational Order in Nematic Phase
Autorzy:
Wolarz, E.
Bauman, D.
Jadżyn, J.
Dąbrowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493609.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Df
61.30.Gd
77.22.Ch
Opis:
Dielectric relaxation study of nematogenic 4-n-alkyl-4'-cyanobiphenyls (nCB, n = 5, 6), 4-(trans-4'-n-alkylcyclohexyl)isothiocyanatobenzenes (nCHBT, n = 6, 8), 4-cyanophenyl-4'-n-alkylbenzoates (nCPB, n = 6, 8), 4-cyano-3-fluorophenyl-4'-n-octyloxybenzoate (8OCFPB), and 4-cyanophenyl-4'-n-octyloxy-3'-fluorobenzoate (8OCPFB) was performed in the frequency range from 50 kHz to 100 MHz in the nematic and isotropic phases. The static permittivity and the relaxation process related to the rotation of molecules around their short axis was analyzed. For some of these liquid crystals anomalous temperature dependence of static permittivity in the pretransitional region of the isotropic phase was observed. Based on the Meier-Saupe-Martin model of molecular diffusion in nematics, the orientational order parameter 〈$P_2$〉 was determined from dielectric relaxation times and retardation factor. The values of 〈$P_2$〉 calculated from the dielectric relaxation data were compared with the results obtained from measurements of polarized electronic absorption. Correlations between the magnitude of the dielectric pretransitional effect and the orientational order in the nematic phase were discussed.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 447-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microwave X-Band Resonances in Doped Cd₂Nb₂O₇ Monocrystals
Autorzy:
Waplak, S.
Ostrowski, A.
Wencka, M.
Bednarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/1030214.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
77.22.Ch
77.80.B-
77.84.Ek
Opis:
Cadmium pyroniobiate (CNO) is the ferroic material with unusual diffuse phase diagram which includes both relaxor and nanocluster domains. We present the data for CNO crystals with several admixtures of paramagnetic ions studied on X and S microwave bands at zero-external magnetic field and classical EPR conditions. Our results lead to an assertion of a ferroelectric resonance effect due to "electronic ferroelectricity". The data fit well to the Falicov-Kimball theoretical model applicable to strongly-correlated-electron or mixed-valence systems.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 7-11
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:
Electroconductive and Dielectric Properties of Composites Based on Bismuth Vanadate
Autorzy:
Torba, J.
Golubko, N.
Fortalnova, E.
Kaleva, G.
Safronenko, M.
Venskovskii, N.
Politova, E.
Powiązania:
https://bibliotekanauki.pl/articles/1549689.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Tm
77.22.Ch
72.20.-i
61.72.-y
Opis:
Ceramic composites $(100 - n)Bi_{4}V_{2}O_{11-z}-nCe_{0.9}Gd_{0.1}O_{1.9}$ with n=0÷25 wt% were prepared and studied by the X-ray diffraction, dielectric spectroscopy, and impedance methods. Slight increase in the unit cell volume accompanied by monotonous decrease in temperatures and broadening of the α-β and β-γ phase transitions with increasing fluorite content was observed in the composites studied. Increase in melting temperatures of composites with n ≥ 10 with the retention of their high ionic conductivity was also proved.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 24-26
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetodielectric Properties of Transformer Oil Based Magnetic Fluids
Autorzy:
Timko, M.
Kopcansky, P.
Molcan, M.
Tomco, L.
Marton, K.
Molokac, S.
Rybar, P.
Stoian, F.
Holotescu, S.
Taculescu, A.
Powiązania:
https://bibliotekanauki.pl/articles/1428655.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Gm
77.22.Ch
Opis:
This contribution is devoted to study of dielectric and magnetodielectric properties in transformer oil based magnetic fluid. The dielectric permittivity and their anisotropy at various mutual orientation electric (50 Hz) and magnetic field were shown at the different volume concentrations of nanoparticles at room temperature. The linear increase of dielectric constant with volume concentration was confirmed which is in good agreement with the theoretical Maxwell prediction. The dielectric anisotropy factor g(B, ω) is very close to g=1. The values of permittivity increased with the increase of volume fraction of magnetite nanoparticles. The highest value of anisotropy characterized by deviation of permittivity $Δε=ε_{∥} - ε_{⊥}$ was found for the highest volume concentration which could mean that no aggregation of magnetite nanoparticles had appeared.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1253-1256
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Quality Gate Insulator/GaN Interface for Enhancement-Mode Field Effect Transistor
Autorzy:
Taube, A.
Kruszka, R.
Borysiewicz, M.
Gierałtowska, S.
Kamińska, E.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1492515.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.dj
77.22.Ch
73.40.Qv
81.15.Gh
81.15.Cd
Opis:
The capacitance-voltage measurements were applied for characterization of the semiconductor/dielectric interface of GaN MOS capacitors with $SiO_2$ and $HfO_2//SiO_2$ gate stacks. From the Terman method low density of interface traps $(D_{it} \approx 10^{11} eV^{-1} cm^{-2})$ at $SiO_2//GaN$ interface was calculated for as-deposited samples. Samples with $HfO_2//SiO_2$ gate stacks have higher density of interface traps as well as higher density of mobile charge and effective charge in the dielectric layers. High quality of $SiO_2//GaN$ interface shows applicability of $SiO_2$ as a gate dielectric in GaN MOSFET transistors.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-022-A-024
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:
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:
Investigation of the Dependence of Dielectric Properties of D-Serine Admixtured TGS Crystals on the Distance from the Seed of the Crystal Growth
Autorzy:
Stankowska, J.
Czarnecka, A.
Dongo Gemi, Bangobango
Powiązania:
https://bibliotekanauki.pl/articles/1929193.pdf
Data publikacji:
1993-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
Opis:
Dielectric properties of a D-serine admixtured triglycine sulphate (TGS) crystal were studied on samples cut out from different sites in the crystal. The value of spontaneous polarization P$\text{}_{s}$ measured on b-cuts was found to be independent of the site. Whereas the coercive field E$\text{}_{c}$ values were higher for the samples cut out closer to the seed than for those cut out at the ends of the crystal along b axis. After rejuvenation the values of the bias field E$\text{}_{b}$ increased in contrary to the effect observed in the pure TGS crystals. An exponentially decreasing dependence of the maximum permittivity ε$\text{}_{max}$ on the site of the samples (b-plates) cut out along b axis from -b to +b positions, was obtained.
Źródło:
Acta Physica Polonica A; 1993, 83, 4; 485-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Consequences of Confinement Conditions on Absorption in Molecular Nanofilms
Autorzy:
Šetrajčić, I.
Rodić, D.
Šetrajčić, J.
Šetrajčić-Tomić, A.
Vučenović, S.
Powiązania:
https://bibliotekanauki.pl/articles/1030578.pdf
Data publikacji:
2018-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.35.-y
71.35.Aa
77.22.Ch
77.55.-g
78.20.Bh
78.68.+m
81.07.Nb
Opis:
This paper presents a model of molecular ultrathin crystalline film and analysis of dielectric properties of these spatially very restricted structures. Using the two-time dependent Green functions the energy spectrum and possible exciton states were determined and the dynamic permittivity was calculated. It was shown that the appearance of localized states in the boundary layers of the film depend on the thickness and the changing values of parameters in the border areas of the film. These localized states define schedule and determine the number of resonant absorption lines in the infrared area of the external electromagnetic radiation.
Źródło:
Acta Physica Polonica A; 2018, 133, 1; 129-139
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complex Dielectric Coefficient of Breast Phantom Prepared for Breast Cancer Detection
Autorzy:
Sayinti, A.
Açikalin, E.
Çoban, K.
Vertii, A.
Powiązania:
https://bibliotekanauki.pl/articles/1400036.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
Opis:
Microwave measurement techniques attract attention due to its practical solutions in breast cancer imaging. Early detection of cancer is the purpose of these imaging studies. For these imaging processes, phantoms which reflect the properties of the area to be imaged are produced. The produced homogeneous phantoms are imaged by stepper frequency of radar technology, as the narrow bands are used for heterogeneous mixtures. Phantoms are used since 70's until today. Different methods are experimented for producing phantoms of tissue, muscle, fat, skin, etc. Iron powder, polymer materials, various oils and gelatins used today are the materials used for producing the phantoms. In this study, phantom breast imaging is aimed. Phantoms breast and breast tumor samples are created. For phantoms and tumor samples, reflection and transmittion measurements are done with Network Analyzer in X-Band (8.2-12.4 GHz). Complex permittivity is calculated with Agilent 85071 Material Measurement Software-Fast Method (NIST-iterative method). It was considered breast phantom with tumor model for 3D imagine at 2-3.5 GHz frequency range.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 464-466
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of a Dielectric Relaxation in Weakly Polar Ferrofluids
Autorzy:
Rajňák, M.
Kurimský, J.
Dolník, B.
Cimbala, R.
Paulovičová, K.
Kopčanský, P.
Timko, M.
Powiązania:
https://bibliotekanauki.pl/articles/1032784.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
47.65.Cb
77.22.Ch
77.22.Gm
82.70.Dd
Opis:
In this paper, we report on the temperature dependent broadband dielectric response of a ferrofluid based on transformer oil and magnetite nanoparticles covered with oleic acid molecules. For that purpose the method of dielectric spectroscopy has been chosen in the frequency range from 20 Hz up to 100 kHz. The experiments were carried out on thin film ferrofluid samples confined in a glass plate capacitor containing indium tin oxide (ITO) plate electrodes. The obtained complex permittivity spectrum shows a pronounced dielectric dispersion in the low frequency range. Taking into account the ferrofluid composition we associate this relaxation with ion impurity polarization at the nanoparticle-oil interface. The strong temperature dependence of the relaxation process has been found when conducting the experiments in the temperature range from 298 K to 358 K. The relaxation time of the revealed process exhibits a typical Arrhenius behavior. Based on the conducted experiments and analysis, we propose some reasonable practical applications of the studied ferrofluid in the field of electrical engineering.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 943-945
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Transitions and Transport Properties of the Bismuth Vanadate-Based $(Bi,La)_{4}(V,Zr)_{2}O_{11-z}$ Ceramics
Autorzy:
Politova, E.
Torba, J.
Fortalnova, E.
Kaleva, G.
Safronenko, M.
Venskovskii, N.
Powiązania:
https://bibliotekanauki.pl/articles/1549668.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
64.60.-i
72.20.-i
77.22.Ch
77.22.Gm
Opis:
Ceramic solid solutions $(Bi_{1-y}La_{y})_{4}(V_{1-x}Zr_{x})_{2}O_{11-z}$ with x = 0-0.05, y = 0-0.16 have been prepared by the solid state reaction method. The samples were studied by differential thermal analysis, X-ray diffraction, dielectric spectroscopy, and impedance methods. The concentration and temperature stabilization regions of the polymorphous α-, β-, γ'-, γ-modifications have been determined. The effects observed in dielectric properties, conductivity, and impedance data confirmed the influence both of intrinsic oxygen vacancies and those "pinned" at ferroelectric domain boundaries on the temperature hysteresis of α-β phase transition and their contribution to mechanism of oxygen ion transport.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 20-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polymer-oxide composites: toward new optical materials
Autorzy:
Nedilko, S.
Powiązania:
https://bibliotekanauki.pl/articles/1052642.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.Ch
78.55.-m
78.66.Sq
Opis:
Brief summary concerning properties of the polymer matrix incorporated with inorganic, e.g. oxide particles, micro/nanocomposites and opportunity to use these composites as optical materials for modern optics and optoelectronic devices is presented in the work. Structure and morphology of the several sets of the new polymer micro/nanocomposites based on the microcrystalline cellulose incorporated with micro/nanoparticle of various oxides (NaNO₂, La_{1-x}Sm_{x}VO₄, La_{1-x}Eu_{x}VO₄ and K₂Eu(PO₄)(MoO₄)), were prepared by "dry" and "wet" cool pressing procedure. Morphology of these composites was described as ensemble of cellulose plates and located gains of the oxide particles. Temperature dependences of complex dielectric permittivity and luminescence properties of the composites were studied. Temperature and electromagnetic field frequency dependences of the dielectric permittivity revealed influence of oxide particles on the characteristics of the microcrystalline cellulose. Both wide band (matrix emission) and narrow lines (RE ions emission) of visible luminescence (350-750 nm range) of the composites is excited in the range 250-550 nm. The luminescence characteristics displayed effect of cellulose on the electronic system of the Sm³⁺ and Eu³⁺ ions and effect of oxide particles on the cellulose matrix was shown, too. Spectral characteristics and high intensity of luminescence showed perspectives of studied composites to be used as light converters in LED and elsewhere as optics luminescent materials.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 829-837
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 34

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