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Wyszukujesz frazę "barium titanate ceramics" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of Sn and Pb Ions Substitutions on Dielectric Properties of Barium Titanate
    Autorzy:
    Bąk, W.
    Kajtoch, C.
    Ptaszek, S.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Ziętek, D.
    Glos, T.
    Garbarz-Glos, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352509.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium titanate ceramics
    dielectric properties
    phase transition
    Opis:
    The results of the microstructural and dielectric measurements of (Ba1-xPbx)(Ti1-xSnx)O3 (BPTSx) (x = 0, 0.05, 0.10, 0.30) polycrystalline samples are presented. The samples were obtained by means of a high temperature synthesis and their expected stoichiometry was confirmed by energy dispersive spectroscopy (EDS) measurements. The dielectric properties of BPTSx were studied with the use of broadband dielectric spectroscopy. The measurements over a wide range of temperature (from 140 K to 600 K) and frequency (from 0.1 Hz to 10 MHz) were performed. The experimental results indicate an influence of Pb ions in a sublattice A and Sn ions in a sublattice B substitution on paraelectric - ferroelectric phase transition parameters. Diffused phase transitions from a paraelectric to ferroelectric state (for x = 0.10 and x = 0.30) were observed. From the electric modulus measurements in the frequency domain the relaxation times and the activation energy were determined.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 905-908
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiscale Approach for Modeling Fracture in Piezoelectric Ceramics
    Autorzy:
    Biglar, M.
    Stachowicz, F.
    Trzepieciński, T.
    Gromada, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355254.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium titanate
    BEM
    boundary element method
    ceramics
    Opis:
    The barium titanate material is the most intensively studied perovskite material due to its wide use in the ceramic industry. Barium titanate is also technologically important material owing to its ferroelectric behaviour at and above room temperature. The paper presents an effective implementation of boundary element multiscale method in analyzing of fracture of piezoelectric ceramics. This method can be easily used to get a better understanding of damage mechanism in the ceramic materials in order to improve the constitutive models and to support the future design of those materials. In this method the relation of boundary element method for obtaining traction is presented. The main advantage of boundary element method is the reduction of the dimensionality of the problem. Boundary element method becomes very attractive in cases of numerically complex problems that are computationally expensive.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 22-28
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Effect of Semiconductor Element Substitution on the Electric Properties of Barium Titanate Ceramics
    Autorzy:
    Garbarz-Glos, B.
    Lisińska-Czekaj, A.
    Czekaj, D.
    Bąk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/354672.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium titanate
    ceramics
    dielectric permittivity
    electric conductivity
    phase transitions
    PTCR effect
    Opis:
    The investigated ceramics were prepared by a solid-state reaction from simple oxides and carbonates with the use of a mixed oxide method (MOM). The morphology of BaTi0.96Si0.04O3 (BTSi04) ceramics was characterised by means of a scanning electron microscopy (SEM). It was found that Si+4 ion substitution supported the grain growth process in BT-based ceramics. The EDS results confirmed the high purity and expected quantitative composition of the synthesized material. The dielectric properties of the ceramics were also determined within the temperature range (ΔT=130-500K). It was found that the substitution of Si+4 ions had a significant influence on temperature behavior of the real (ε’) and imaginary (ε”) parts of electric permittivity as well as the temperature dependence of a.c. conductivity. Temperature regions of PTCR effect (positive temperature coefficient of resistivity) were determined for BTSi04 ceramics in the vicinity of structural phase transitions typical for barium titanate. No distinct maximum indicating a low-temperature structural transition to a rhombohedral phase in BTSi04 was found. The activation energy of conductivity was determined from the Arrhenius plots. It was found that substitution of Si ions in amount of 4wt.% caused almost 50% decrease in an activation energy value.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 887-890
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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