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    Wyświetlanie 1-7 z 7
    Tytuł:
    Investigation of La3+ Doping Effect on Piezoelectric Coefficients of BLT Ceramics
    Autorzy:
    Wodecka-Dus, B.
    Kozielski, L.
    Erhart, J.
    Pawełczyk, M.
    Radoszewska, D.
    Adamczyk, M.
    Bochenek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352118.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    BLT
    piezoelectric coefficients
    Lead-free piezoelectric ceramics
    Opis:
    Effects of La3+ admixture in barium lanthanum titanate (BLT) ceramics system with colossal permittivity on performance of prospective piezoelectric cold plasma application were studied. Usage of cold atmospheric pressure plasma appears promising in terms of industrial and healthcare applications. Performed investigation provide consistent evaluation of doping lanthanum amount on piezoelectric coefficients values with simultaneous capability of charge accumulation for effective plasma generation. Modification of ferroelectric materials with heterovalent ions, however with the lower radii than the original atoms, significantly affects their domain mobility and consequently electromechanical properties. To determine the piezoelectric coefficients, the resonanceantiresonance method was implemented, and values of piezoelectric and dielectric parameters were recorded. Finally the results indicated that addition of 0.4 mol.% of La3+ ions to the ceramic structure maximally increased the values of piezoelectric coefficient to d33 = 20 pC/N and to huge dielectric constant to ε33 T = 29277.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 691-696
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic Matching Characteristics of Annular Piezoelectric Ultrasonic Sensor
    Autorzy:
    Li, Haoran
    Hu, Yan
    Li, Laibo
    Xu, Dongyu
    Powiązania:
    https://bibliotekanauki.pl/articles/2141675.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piezoelectric ceramics
    ultrasonic sensors
    acoustic matching characteristics
    Opis:
    Using intelligent materials and sensors to monitor the safety of concrete structures is a hot topic in the field of civil engineering. In order to realize the omni-directional monitoring of concrete structural damage, the authors of this paper designed and fabricated an embedded annular piezoelectric ultrasonic sensor using the annular piezoelectric lead zirconate titanate (PZT) ceramic as a sensing element and epoxy resin as the matching and the backing layers. The influence of different matching and backing layers thickness on the acoustic characteristic parameters of the sensor were studied. The results show that the resonant frequency corresponding to the axial mode of annular piezoelectric ceramics moves toward the high frequency direction with the decrease of the height of piezoelectric ceramics, and the radial vibration mode increases as well as the impedance peak. With the thickness of the backing layer increases from 1 mm to 2 mm, the radial resolution of the annular piezoelectric ultrasonic sensor is enhanced, the pulse width is reduced by 39% comparing with the sensors which backing layer is 1 mm, and the head wave amplitude and −3 dB bandwidth are increased by 61% and 66%, respectively. When the matching layer thickness is 3 mm, the sensor has the highest amplitude response of 269 mV and higher sensitivity.
    Źródło:
    Archives of Acoustics; 2022, 47, 2; 275-284
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of barium titanate piezoelectric ceramics for multilayer actuators (MLAs)
    Autorzy:
    Biglar, M.
    Stachowicz, F.
    Trzepieciński, T.
    Gromada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/387500.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    barium titanate
    MLAs
    multilayer actuator
    solid state
    piezoelectric ceramics
    Opis:
    In this paper the characteristics of BaTiO3 ceramics synthesized by solid state method is presented. In order to receive the monophase ceramics the double activation and calcination were applied. A spray drier was used to granulate the powder of BaTiO3. Isostatic and uniaxial pressing were applied to manufacture the barium titanate pellets. The properties of fabricated BaTiO3 ceramics were determined at different stages of production. After the sintering phase, the hardness, the bending strength, the fracture toughness, and the coefficient of thermal expansion of barium titanate sinter were estimated. The BaTiO3 powder is characterized by spherical grains and the average size of 0.5 μm. The small value of the specific surface area of granulate ensured good properties of material mouldability and finally allowed to receive sinters of high density
    Źródło:
    Acta Mechanica et Automatica; 2017, 11, 4; 275-279
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Phase Transitions in BNT-BT Lead-Free Ceramics Around Morphotropic Phase Boundary by Mechanical and Dielectric Spectroscopies
    Autorzy:
    Silva Jr, P. S.
    Diaz, J. C. C. A.
    Florêncio, O.
    Venet, M.
    M’Peko, J. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/353072.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lead-free piezoelectric ceramics
    morphotropic phase boundary
    phase transitions
    mechanical spectroscopy
    dielectric spectroscopy
    Opis:
    In this work, the syntheses and characterization by mechanical and dielectric spectroscopies of (1-x) Bi0.5Na0.5TiO3-xBaTiO3 (BNT-100xBT), with x = 0.05, 0.06 and 0.07, lead-free piezoelectric ceramics is reported. Ceramic samples of BNT-BT have been prepared by mixed-oxide method and then conventionally sintered. X-ray diffraction patterns of sintered samples, indicated for BNT-7BT the presence of tetragonal (P4mm) complex perovskite structure, whereas for BNT-5BT and BNT-6BT the samples exhibit a mixture of tetragonal (P4mm) and rhombohedral (R3c) crystalline phases, which reveal the presence of a morphotropic phase boundary (MPB) in the BNT-BT system. Measurements of internal friction, Q-1, and the storage modulus, E’, as a function of temperature at various frequencies were carried out in a Dynamic Mechanical Analyzer (DMA), in the temperature range from 0ºC to 600ºC. Dielectric profiles are recorded in the frequency range from 1kHz to 100kHz and the temperature range from room temperature to 475ºC. Mechanical loss spectra obtained for investigated compositions of BNT-BT samples showed different frequency-independent anomalies. Two main anomalies for BNT-5BT and BNT-6BT, observed around 100ºC and 430ºC were associated with the ferroelectric-antiferroelectric and antiferroelectricparaelectric phase transitions, respectively. The results obtained from mechanical loss measurements were supported by dielectric relaxation spectra. For BNT-7BT, outside the MPB, four different frequency-independent processes were observed.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 17-20
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferroelectric and ferroelectromagnetic ceramics in a view of possibilities to be used in electroacoustic
    Autorzy:
    Czerwiec, M.
    Zachariasz, R.
    Brzezińska, D.
    Ilczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331509.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    ferroelectricity
    ferroelectromagnetic ceramics
    piezoelectric transducers
    Opis:
    Ferroelectric ceramics were born in the early 1940's with the discovery of the phenomenon of ferroelectricity as the source of the unusually high dielectric constant in ceramic barium titanate capacitors. Since that time, they have been the heart and soul several multibillion dollar industries, ranging from high-dielectric-constant capacitors to later developments in piezoelectric transducers, positive temperature coefficient devices, and electrooptic light valves. Various ceramic formulations, their form, fabrications, functions, and future are described in relation to their ferroelectric nature and specific areas of applications. This paper is intended to illustrate practical uses of ferroelectric and ferroelectromagnetic ceramics obtained and investigated by the authors.
    Źródło:
    Hydroacoustics; 2008, 11; 63-70
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Nb and Ba dopands on the properties of the PZT type ceramics
    Wpływ domieszek Nb i Ba na właściwości ceramiki typu PZT
    Autorzy:
    Zachariasz, R.
    Bochenek, D.
    Dziadosz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352989.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biegunowość
    właściwości piezoelektryczne i dielektryczne
    typ ceramiki PZT
    poling
    piezoelectric and dielectric properties
    PZT type ceramics
    Opis:
    Investigations of an influence of an admixture of ions Ba2+ and Nb5+ on dielectric and piezoelectric properties of the Pb(Zr0.53Ti0.47)O3 (PZT) ceramics were conducted. The PZT type ceramics was synthesized by a conventional method, and compacted by a free sintering method. The PZT type specimens were poling by a low and high temperature method. It was found that there was a positive influence of adding 10mol%Ba and ~2mol%Nb simultaneously on a set of dielectric and piezoelectric parameters, which are important for practical applications of this PZT type ceramics.
    W pracy przeprowadzono badania wpływu domieszki baru Ba2+ i niobu Nb5+ na dielektryczne i piezoelektryczne właściwości ceramiki Pb(Zr0:53Ti0:47)O3(PZT). Ceramika typu PZT była syntetyzowana metodą konwencjonalną, a zagęszczana metodą swobodnego spiekania. Próbki typu PZT polaryzowano metodą niskotemperaturową i wyskotemperaturową. Wykazano, że domieszkowanie ceramiki PZT domieszka Ba w ilosci 10mol%Ba oraz domieszka niobu w ilosci ok. 2mol% Nb wpływa pozytywnie na jej dielektryczne i piezoelektryczne właściwości, co jest niezwykle istotne dla jej praktycznych zastosowań.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 1217-1222
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Sb and MnO2-Doping on Phase Transitions, Crystal Structure, Thermal, Dielectric, Ferroelectric and Piezoelectric Properties of Na0.5K0.5NbO3 Ceramics
    Autorzy:
    Suchanicz, J.
    Faszczowy, I.
    Czaja, P.
    Kusz, J.
    Zubko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354339.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Na0.5K0.5-NbO3-based ceramics
    structural properties
    ferroelectric properties
    dielectric properties
    piezoelectric properties
    Opis:
    Lead-free ceramics of Na0.5 K0.5 Nb1-x Sbx O3 (NKNS) and Na0.5 K0.5 Nb1-x Sbx O3 + 0.5 mol%MnO2 (NKNS + 0.5 mol%MnO2) (0 < x < 0.06) ceramics were prepared by a conventional solid-state hot pressing method. The ceramics possess a single-phase perovskite structure with orthorhombic symmetry. Microstructural examination revealed that Mn doping of NKNS leads to improvement of densification. The cubic-tetragonal and tetragonal-orthorhombic phase transitions of NKNS shifted to higher and lower temperature, respectively after introduction of Mn ion. Besides, ferroelectric and piezoelectric properties were improved. The results were discussed in term of difference in both ionic size and electronegativity of Nb5+ and Sb5+ and improvement of densification after Mn ion doping.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 633-639
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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