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    Wyświetlanie 1-3 z 3
    Tytuł:
    Structural, Electrical and Mössbauer Effect Studies of 0.5Bi $rm_{0.95}Dy_{0.05}FeO_3-0.5Pb(Fe_{0.5}Nb_{0.5})O_3$ Multiferroics
    Autorzy:
    Stoch, A.
    Kulawik, J.
    Stoch, P.
    Maurin, J.
    Zachariasz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811599.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    76.80.+y
    77.22.-d
    Opis:
    $0.5Bi_{0.95}Dy_{0.05}FeO_3-0.5Pb(Fe_{0.5}Nb_{0.5})O_3$ is a multiferroic material which exhibits ferroelectric and antiferromagnetic ordering. (The synthesis of such compounds is rather difficult.) In this paper the way of the synthesis of $0.5Bi_{0.95}Dy_{0.05}FeO_3-0.5Pb(Fe_{0.5}Nb_{0.5})O_3$ is presented. The detailed X-ray and Mössbauer effect studies were done and crystal and hyperfine interaction parameters were obtained. To measure electrical properties of the compound the impedance spectroscopy measurements were performed. The obtained impedance spectra were fitted using a proposed equivalent electrical circuit and the results were discussed in the scope of the brick layer model without easy paths.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1585-1590
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of High Permittivity Bismuth Copper Titanate in Multilayer Capacitors
    Autorzy:
    Szwagierczak, D.
    Kulawik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490915.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.22.-d
    81.20.-n
    84.32.Tt
    85.40.Xx
    Opis:
    A nonferroelectric high permittivity compound with the perovskite structure, $Bi_{2//3}Cu_3Ti_4O_{12}$, was synthesized at 900°C. The ceramic powder and appropriate organic additives were used for preparation of a slurry for tape casting. The obtained green tapes were smooth, flexible, and with a uniform thickness of 25 μm after drying at 50°C. Ag electrodes were screen printed on green rectangular sheets cut by a laser. Subsequent operations were screen printing of Ag internal electrodes, stacking of green sheets, isostatic lamination, cutting, deposition of external terminations and co-firing of dielectric and conductive layers at 850°C. Scanning electron microscopy observations showed well sintered, dense, fine-grained microstructure of ceramic layers and good cooperation with the electrodes made of commercial Ag paste. Capacitance and dissipation factor of multilayer capacitors were examined in the temperature range from - 55 to 330C at frequencies 10 Hz-2 MHz. The fabricated multilayer capacitors exhibit high capacitance and relatively low temperature coefficient of capacitance in the temperature range from - 55 to 110°C. The obtained lead-free high permittivity nonferroelectric material $Bi_{2//3}Cu_3Ti_4O_{12}$ is a spontaneously formed internal barrier capacitor. This material seems to be a promising alternative for conventional lead-based relaxor dielectrics in multilayer ceramic capacitors.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 119-121
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelectric Properties of $0.3Bi_{0.95}Dy_{0.05}FeO_3-0.7Pb(Fe_{2//3}W_{1//3})O_3$ Multiferroic
    Autorzy:
    Stoch, A.
    Stoch, P.
    Kulawik, J.
    Zieliński, P.
    Maurin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490931.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.85.+t
    77.22.-d
    77.55.Nv
    77.80.-e
    77.80.Jk
    Opis:
    Pb-based complex perovskites with $Fe^{3+}$ like $Pb(Fe_{2//3}W_{1//3})O_3$ were found to be interesting because of their unique properties such as relaxor and magnetoelectric behavior. $Pb(Fe_{2//3}W_{1//3})O_3$ is ferroelectric with ferroelectric Curie temperature $T_{C}$ between 150 and 200 K and at the same time is antiferromagnetic with magnetic Néel temperature about 400 K. $BiFeO_3$ is a well known perovskite compound which exhibits ferroelectric ($T_{C}$ = 1103 K) and antiferromagnetic ($T_{N}$ = 643 K) ordering simultaneously. The polycrystalline sample of $0.3Bi_{0.95}Dy_{0.05}FeO_3-0.7Pb(Fe_{2//3}W_{1//3})O_3$ were synthesized using standard sintering procedure. Magnetization vs. magnetic field (at 4.2 K) curves were measured. Magnetoelectric properties of the sample were obtained.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 128-130
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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