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    Wyświetlanie 1-4 z 4
    Tytuł:
    Study on Magnetic Properties of the U-Type Ferrite According to Substituted Elements
    Autorzy:
    Jeong, Kwang-Pil
    Kim, Jeong-Gon
    Yang, Su-Won
    Yun, Jae-Ho
    Choi, Jin-Hyuk
    Powiązania:
    https://bibliotekanauki.pl/articles/354006.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    U-type ferrite
    hexagonal ferrite
    sol-gel process
    Opis:
    The magnetic properties of the U-type ferrite synthesized by a sol-gel process had studied by substituting cobalt with manganese or zinc in cobalt-based U-type ferrite. The substituted U-type ferrite showed a dominant crystal structure at a different substitution ratio of manganese and zinc. The change of the starting temperature of U-type ferrite formation according to substitutional elements was confirmed by TG-DTA analysis. In the case of manganese substitution, the starting temperature of U-type ferrite formation lowered, and on the contrary, when zinc was substituted, it became higher. The magnetic properties of the U-type ferrite substituted with manganese showed a tendency that the saturation magnetization was decreased and the coercivity was increased as the manganese ratio increased. The highest saturation magnetization was 57.9 emu/g in the specific composition (Ba4Co0.5Zn1.5Fe36O60) substituted with zinc.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 501-505
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Microwave Absorption Characteristics by Coating Layer in Substituted U-Type Ferrites
    Autorzy:
    Jeong, Kwang-Pil
    Kim, Jeong-Gon
    Yang, Su-Won
    Choi, Jin-Hyuk
    Park, Seung-Young
    Powiązania:
    https://bibliotekanauki.pl/articles/353196.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hexagonal ferrite
    U-type ferrite
    silicon oxide layer
    microwave absorption
    Opis:
    The U-type ferrite is a kind of hexagonal ferrite, and it is known as a microwave absorber in the X-band. The magnetic and dielectric loss of the U-type ferrite change to the composition and coating layer, etc. In this study, the silicon oxide layer was coated on the substituted U-type ferrites to improve microwave absorption characteristics. The complex permittivity and complex permeability were measured using toroidal specimens that were press-molded and the measured frequency range was set from 2-18 GHz. The improvement of the microwave absorption rate was different according to the type of the substituted U-type ferrites. Only in the substituted U-type ferrites with nickel and zinc, an improvement in the microwave absorption rate due to enhancement of magnetic loss was confirmed. The highest microwave absorption was 99.9% at 9.6 GHz, which was S_Z0.5 U.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1287-1291
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Change of Easy Magnetization Axis and Frequency of Reflection Loss by Co-Ti Substitution in Barium Ferrite
    Autorzy:
    Yang, Su-Won
    Kim, Jeong-Gon
    Jeong, Kwang-Pil
    Shim, Han-Ul
    Cho, Seong-Il
    Kim, Min-Young
    Powiązania:
    https://bibliotekanauki.pl/articles/354821.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium ferrite
    Co-Ti substitution
    easy magnetization axis
    Opis:
    In this study, BaFe12-2xCoxTixO19 (X : 0 to 2.0, 0.2) powders were synthesized by sol-gel process. TG-DTA, XRD, SEM, VSM, and Network analyzer were measured in order to influence easy magnetization axis change on the wave absorption frequency range change. The easy magnetization axis change of the annealed powder at 900°C and 1200°C was confirmed by the coercive force decreased 4,800 and 3,870 Oe to 260 and 269 Oe, respectively, at the substitution ratio of 0.8 and 1.0. And it was confirmed that the change of the easy magnetization axis affected the change of the wave absorption frequency. The wave absorption frequency of substituted Barium Ferrite was less than 10 GHz range after the easy magnetization axis of Barium ferrite changed to a-b plan direction. It was confirmed the BaFe12-2xCoxTixO19(x=0.8 to 1.6) was synthesized by the sol-gel process and it was annealed at 900°C and 1200°C, which could be used as a wave absorber in the X-band region of 10 GHz less.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 835-839
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Degradation Behavior of Ag Nanowire-Coated Transparent Conductive Film
    Autorzy:
    Kim, Jae-Yeon
    Kim, Hye-Young
    Kim, Hyun-Su
    Yoo, Ki-Tae
    Yang, Won-Jon
    Byeon, Jai-Won
    Powiązania:
    https://bibliotekanauki.pl/articles/354224.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silver nanowire
    isothermal degradation
    electrical resistance
    overcoating
    Opis:
    For the reliable applications of silver nanowires, AgNW, which is used as a conductive transparent film in electronic devices, the isothermal degradation behaviors of AgNW films with and without overcoating were investigated. Accelerated isothermal degradation was performed as a function of temperature, time, and atmosphere. Electrical resistance and optical transmittance were measured and correlated with the microstructural damages, such as formation of oxide particles and fragmentations of AgNW, which were quantitatively determined from the scanning electron micrographs. The overcoating retarded the formation of oxide particles and subsequent fragmentations as well as resulting degradation in electrical resistance without affecting the optical transmittance.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 913-916
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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