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    Wyświetlanie 1-12 z 12
    Tytuł:
    A Novel Electrically Tunable Long-Period Fiber Grating Using a Liquid Crystal Cladding Layer
    Autorzy:
    Czapla, A.
    Woliński, T.
    Nowinowski-Kruszelnicki, E.
    Bock, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506728.pdf
    Data publikacji:
    2010-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Cn
    42.79.Dj
    42.81.Pa
    42.79.Kr
    Opis:
    The main aim of the presented work is the integration of a long-period fiber grating and a liquid crystal into a hybrid structure, in order to develop an innovative fiber optic device controlled by an external electric field. The studied long-period fiber grating was fabricated using UV irradiation in a boron co-doped fiber (PS1250/1500, manufactured by Fibercore). As a liquid crystal we used a typical 5CB nematic liquid crystal. The sensing mechanism of the proposed loss filter relies on long-period fiber grating attenuation bands sensitivity to optical properties of the liquid crystal layer. The results obtained show that the long-period fiber grating with a nanosized liquid crystal layer exhibits one order of magnitude higher electrical sensitivity and a lower level of the voltage control than the long-period fiber grating with a micro-sized liquid crystal layer.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 6; 1104-1107
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photocatalytical Decomposition of Contaminants οn Thin Film Gas Sensors
    Autorzy:
    Radecka, M.
    Łysoń, B.
    Lubecka, M.
    Czapla, A.
    Zakrzewska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539145.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.-r
    73.90.+f
    82.50.Hp
    Opis:
    Gas sensing materials have been prepared in a form of $TiO_{2}-SnO_{2}$ thin films by rf reactive sputtering from $Ti:SnO_{2}$ and $Sn:TiO_{2}$ targets. Material studies have been performed by scanning electron microscopy, atomic force microscopy, X-ray diffraction at grazing incidence, Mössbauer spectroscopy, X-ray photoelectron spectroscopy and optical spectrophotometry. Dynamic gas sensing responses have been recorded as reproducible changes in the electrical resistance upon introduction of hydrogen at a partial pressure of 100-6000 ppm over a wide temperature range 473-873 K. Contamination experiments have been carried out with the motor oil (40 vol.% solution in $CCl_{4}$) in order to study the effect of UV light illumination on the gas sensor response. Optical spectroscopy has been applied to monitor the photodecomposition of the test compound, bromothymol blue. The Electronic Nose, ALPHA MOS FOX 4000 has been used in order to differentiate between different groups of motor oil vapors.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 415-419
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral Tuning of the Long-Period Fiber Gratings by Using Low Birefringence Liquid Crystals
    Autorzy:
    Czapla, A.
    Bock, W.
    Woliński, T.
    Dąbrowski, R.
    Nowinowski-Kruszelnicki, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493037.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Cn
    42.79.Dj
    42.81.Pa
    42.79.Kr
    Opis:
    The work presented in this paper is focused on investigation of the spectral properties of the long-period fiber gratings combined with the liquid crystals, named liquid crystal long-period fiber gratings. The experiments carried out showed that the proposed designs of the liquid crystal long-period fiber gratings can offer very interesting spectral properties and can introduce a new level of sensitivity. In particular, a high-efficiency thermal tuning of the long-period fiber gratings coated with low-birefringence liquid crystal layers could be achieved and gave rise to a fast and wide switching ability of the attenuation bands within their transmission spectrum.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 589-592
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron Paramagnetic Resonance Study of the [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{3}$Cl$\text{}_{11}$ Monocrystal Doped with Cu$\text{}^{2+}$ ion
    Autorzy:
    Ostrowski, A.
    Bednarski, W.
    Waplak, S.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2030763.pdf
    Data publikacji:
    2002-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.-v
    05.70.Fh
    Opis:
    The paper reports the electron paramagnetic resonance investigation of Cu$\text{}^{2+}$ doped [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{3}$Cl$\text{}_{11}$ (DMACC) monocrystal. DMACC:Cu$\text{}^{2+}$ was studied in the temperature range (6÷293) K. We did not observe any anomalies of spin-Hamiltonian parameters of Cu$\text{}^{2+}$ ion corresponding to the temperature anomalies observed in dielectric studies. The electron paramagnetic resonance anomaly recorded at about 40 K results from the subtle changes in bonds angles and Cu-Cl distances and suggests the smooth second order transition.
    Źródło:
    Acta Physica Polonica A; 2002, 101, 6; 893-899
    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:
    Phase Transitions in (CH$\text{}_{3}$)$\text{}_{2}$ CHNH$\text{}_{3}$CdCl$\text{}_{3}$ Crystal
    Autorzy:
    Krzewska, U.
    Jakubas, R.
    Dacko, S.
    Czapla, Z.
    Waśkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920518.pdf
    Data publikacji:
    1992-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    05.70.Fh
    77.20.+y
    Opis:
    The crystal of (CH$\text{}_{3}$)$\text{}_{2}$CHNH$\text{}_{3}$CdCl$\text{}_{3}$ was grown and its physical properties were investigated. On the ground of DSC, dylatometric and dielectric investigations the phase transition at 390 K on heating process was revealed. On cooling two phase transitions at 382 K and 352 K were found. Polarized microscope observations show appearance of ferroelastic domain structure and cracks at 390 K on heating. On cooling the observed domain structure vanishes at 352 K.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 3; 379-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the Structural Phase Transition in a Perovskite-Type Diaminopropanetetrachlorocuprate(II) NH₃(CH₂)₃NH₃CuCl₄ Crystal
    Autorzy:
    Czupiński, O.
    Ingram, A.
    Kostrzewa, M.
    Przesławski, J.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033438.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.D-
    77.22.Gm
    78.70.Bj
    Opis:
    Chemical preparation, differential scanning calorimetry and thermal stability differential thermal gravimetry studies, positron annihilation lifetime investigations, optical observations as well as electric properties of the NH₃(CH₂)₃NH₃CuCl₄ crystal are presented. On the basis of the differential scanning calorimetry response the structural phase transition of the first order was observed at 436 K. The enthalpy and entropy of the phase transition are equal to 1120 J/mol and 2.57 J/(mol K), respectively. Differential thermal analysis and thermogravimetric analysis studies confirmed the phase transition at 436 K and one can conclude the chemical and thermal stability of the compound up to about 480 K. Optical observations showed a continuous change of colour from yellow to dark brown above the phase transition to 436 K. Dielectric measurements showed a significant increase of conductivity upon approaching the phase transition regions, with a significant increase above the phase transition temperature. An activation energy dependent on the temperature range, and different for each particular phase, is obtained from measurements of complex impedance.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 304-310
    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:
    Dielectric and Birefringent Properties of [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{2}$CuCl$\text{}_{11}$ Solid Solutions in the Region of Their Phase Transitions
    Autorzy:
    Eliyashevskyy, Yu.
    Kapustianyk, V.
    Dacko, S.
    Czapla, Z.
    Batiuk, A.
    Sveleba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044636.pdf
    Data publikacji:
    2006-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    65.40.-b
    77.22.Ch
    Opis:
    On the basis of the optical and dielectric investigations of [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{2}$CuCl$\text{}_{11}$ solid solutions the existence of phase transitions at T$\text{}_{1}$=175 K and T$\text{}_{2}$=117.5 K was confirmed. Both phase transitions were found to be shifted toward lower temperatures with respect to the corresponding transitions in the "host" [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$]$\text{}_{5}$Cd$\text{}_{3}$Cl$\text{}_{11}$ crystals. It was found that the proton conductivity in [(CH$\text{}_{3}$)$\text{}_{2}$NH$\text{}_{2}$ ]$\text{}_{5}$Cd$\text{}_{2}$CuCl$\text{}_{11}$ crystals is realized through the Grotthus mechanism. The investigations of the birefringent properties confirmed existence of the structural changes at T$\text{}_{0}$=320 K connected with the complex co-operative effect involving weakening of the hydrogen bonds and modification of the Jahn-Teller distortion with temperature.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 2; 171-178
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dielectric and Dilatometric Properties of NH(CH$\text{}_{3}$)$\text{}_{3}$CuCl$\text{}_{3}$·2H$\text{}_{2}$O Low Dimensional Ferroics
    Autorzy:
    Korchak, Yu.
    Kapustianik, V.
    Batiuk, A.
    Girnyk, I.
    Czapla, Z.
    Dacko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872270.pdf
    Data publikacji:
    2004-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.-p
    Opis:
    On the basis of dilatometric and dielectric investigations of NH(CH$\text{}_{3}$)$\text{}_{3}$CuCl$\text{}_{3}$·2H$\text{}_{2}$O crystals the earlier unknown phase transition with considerable temperature hysteresis was found at T$\text{}_{1}^{c}$=198 K and T$\text{}_{1}^{h}$=223 K, respectively, in cooling and heating runs. Existence of the characteristic dielectric dispersion was revealed within the high-temperature phase. It corresponds to the single dielectric relaxator below 250 K as well as to co-existence of two relaxators above this temperature. The determined values of the activation energy and relaxation time are characteristic of the co-operative reorientation of the trimethylammonium cation (high-frequency relaxator) whereas the combined reorientation motions of the CuCl$\text{}_{2}$·2H$\text{}_{2}$O chains would be responsible for the low-frequency relaxation process. It was found that the above mentioned quasi-Debye type processes are involved into the mechanisms of the protonic conductivity.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 1; 39-49
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Ultrasonic Investigations of Phase Transitions in Ferroelectric RbHSeO$\text{}_{4}$ Single Crystal
    Autorzy:
    Sveleba, S. A.
    Bublik, M. I.
    Polovinko, I. I.
    Kityk, A. V.
    Sopronuk, V. P.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920942.pdf
    Data publikacji:
    1992-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.70.Kb
    77.20.+y
    05.70.Fh
    Opis:
    Birefringence and ultrasonic measurements were done for ferroelectric RbHSeO4 crystal. Influences of both stresses (σ$\text{}_{i}$) and pressure on the properties and phase transition were studied as well. The observed dependence of δ(Δn$\text{}_{b}$) = f(σ$\text{}_{5}$) shows hysteresis loop characteristic of ferroelectric phase whereas the dependence of δ(Δn$\text{}_{c}$) = f(σ$\text{}_{6}$) shows hysteresis loop characteristic of ferroelastic phase. Birefringence measurements prove the phase transition to ferroelectric phase at 373 K. Additionally, the phase transition was found at 398 K. The new phase may be regarded as an incommensurate one. On the grounds of the stresses influence the phase diagram is constructed in coordinates T, σ$\text{}_{5}$. The linear decrease in T$\text{}_{c}$ with increase in pressure is observed in ultrasonic studies and it is similar to the results obtained in DSC measurements.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 3; 481-486
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Systems at Criticality: Different Signatures of Scaling
    Autorzy:
    Pełka, R.
    Konieczny, P.
    Fitta, M.
    Czapla, M.
    Zieliński, P.
    Bałanda, M.
    Wasiutyński, T.
    Miyazaki, Y.
    Inaba, A.
    Pinkowicz, D.
    Sieklucka, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399023.pdf
    Data publikacji:
    2013-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.-s
    75.30.Kz
    75.30.Sg
    75.50.Xx
    Opis:
    Different aspects of critical behaviour of magnetic materials are presented and discussed. The scaling ideas are shown to arise in the context of purely magnetic properties as well as in that of thermal properties as demonstrated by magnetocaloric effect or combined scaling of excess entropy and order parameter. Two non-standard approaches to scaling phenomena are described. The presented concepts are exemplified by experimental data gathered on four representatives of molecular magnets.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 6; 977-989
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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