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- 저자 : Syed Samar Abbas (검색결과 1 건)
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Ce-Substituted Co0.5Ni0.5Fe2O4: Structural, Morphological, Electrical, and Dielectric Properties
Syed Samar Abbas,Iftikhar Hussain Gul,Shahid Ameer,Muhammad Anees 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
Functional nano ceramics, especially rare earth substituted ferrites, havenumerous applications in microelectronics. They have certain novelcharacteristics associated with various rare earth substitutions associatedwith electronics. A series of cerium-substituted cobalt nickel ferritenanoparticles with nominal composition CexCo0.5Ni0.5Fe2-xO4 (wherex = 0.00, 0.05, 0.10, 0.15, and 0.20) was prepared in powder form bychemical co-precipitation and sol-gel auto combustion methods. Sampleswere characterized by x-ray diffraction (XRD), scanning electronmicroscopy (SEM), Fourier transform infrared spectroscopy (FT-IR),dielectric properties, and DC electrical resistivity. XRD analysis of all thesamples confirms the formation of the spinel structure of Fd-3m spacegroup. Crystallite size “t” was found to decrease, whereas both x-raydensity “Dx” and lattice constant “a” were found to increase by increasingCe concentration from 8.35 Å to 8.36 Å and 8.37 Å for sol-gel and coprecipitation,respectively. SEM results show the presence of uniformlydistributed and almost spherical-shaped particles for both techniques. FTIR measurements were used to further confirm thecomposition, i.e., cation substitution. The DC electrical resistivity of the x = 0.00 sample is higher than Ce-substituted ferritesamples and in the range of 108 Ω-cm at 373 K. Dielectric spectroscopy is also studied from 100 Hz to 5 MHz as a function offrequency. To our knowledge, this is the first reported research of this particular composition.
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