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- 저자 : Ejaz Syeda Rabia (검색결과 2 건)
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Ejaz Syeda Rabia,Khan Muhammad Azhar,Gulbadan Shagufta,Akhtar Majid Niaz,Ahmad Mukhtar,Hussain Altaf,Islam Misbah ul 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.4
Co 2+ and Cr 3+ -substituted SrBaCu Fe 28- y O 46 X-type hexaferrite with x = y = 0, 0.1 to 0.5 (step = 0.1) were prepared Co Cr 2- x x y through auto-combustion sol–gel method and sintered at 1250 °C for 5 h which was found from thermal analysis. The thermal investigation, phase detection, spectral, magnetic, and dielectric characteristics of the prepared composition were investigated by TGA, XRD, FTIR, VSM, and dielectric measurement. XRD patterns of the entire composition confi rmed the development of a single phase of X-type structure. The enhancement in the lattice parameters and cell volume was observed by varying the Co–Cr concentration, attributed to the larger ionic radii substitution. FTIR\spectra of all samples exhibit two absorption peaks in the wavenumber range of 500–550 cm −1 and 418–425 cm −1 that confi rm the formation of hexaferrite. The dielectric properties have been inspected based on frequency and substitution variation in the sample. The dielectric constant exhibits the increasing trend with the Co–Cr ratio. The enhancement in Ac conductivity was also found by increased substitution ions. Single semi-circles were examined in Nyquist plots, attributed to the contribution of the grain boundaries. Detailed magnetic parameters such as saturation magnetization, remanence, squareness ratio, coercivity, and magneto-crystalline anisotropy constant were measured. By the increase in Co–Cr substitution the increased of saturation magnetization ( Ms ) from 61.12 emu/g to 64.89 emu/g, the remanence ( Mr ) from 27.43 emu/g to 30.71 emu/g, and coercivity ( H c ) from 1654.56 Oe to 1863.54 Oe was found. Therefore, the synthesized SrBaCu 2 X-type hexagonal ferrites with the appropriate amount of Co–Cr substitution are suitable candidates for microwave devices and valuable in longitudinal recording media.
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The electrical, dielectric and magnetic effect of MgFe2O4–polypyrrole and its composites
Alburaih H. A.,Khan Sajjad Ahmad,Khosa Rabia Yasmin,Ejaz Syeda Rabia,Khan Abdul Rauf,Muhammad Ghulam,Waheed Muhammad Suleman,Chughtai Adeel Hussain,Manzoor Sumaira,Aman Salma 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
In the modern world of health and life sciences, the utilization of nanoscale materials, particularly magnetic nanoparticles, is a hot topic. Here in the present study, MgFe2O4 is synthesized via the chemical co-precipitation technique, and the polypyrrole (PPy) is fabricated via in situ polymerization technique to form the MgFe2O4/PPy nanocomposite by varying its content in the ferrite material. The electrical, magnetic, and dielectric properties of the fabricated materials were studied to investigate their applications in electronic devices. The magnetization saturation Ms, remanence Mr and coercivity Hc increase with the addition of ferrite material. The activation of the fabricated material increases from 0.11 to 0.34 eV, indicating the increase in electrical resistivity. The other important parameters such as squareness ratio and drift mobility were also calculated. The increment in DC electrical resistivity, saturation magnetic magnetization and remanence as well as reduction in dielectric constant values with the ferrite material addition in the polypyrrole suggest that the materials can be beneficial for recording media as well as high-frequency devices.
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