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RISS 인기검색어
- 검색키워드
- 저자 : Asghari Maqsood (검색결과 3 건)
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Humaira Anwar,Asghari Maqsood 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
Polycrystalline nano ferrites with composition Li0.5Mnx/2Zn0.75-x/2Fe2O4 (x = 0.0, 0.3, 0.6, 0.9, and 1.2) were prepared from sol-gel auto combustion method. The formation of single phase cubic spinel structure was confirmed from XRD analysis and IR-spectroscopy (FT-IR), particle morphology with scanning electron microscopy (SEM) and DC electrical resistivity from two probe method. Electromagnetic measurements were performed from 1 MHz - 1 GHz. The results showed Mn addition improves the magneto-dielectric properties of the prepared samples. The low magnetic loss in very high frequency and ultra-high frequency (VHFUHF)makes them useful in miniaturizing the antennas in the frequency range 1MHz to 1000 MHz. The high reflection loss (RL) of 45 dB for x = 0 and relatively wide-band gap made them suitable to use in the lower micro wave (MW) region.
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Allah Bakhsh,Asghari Maqsood 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.6
The nano-crystalline erbium oxide powder was synthesized through the sol-gel technique. The effect of sintering temperature from 250°C to 1400°C on structure, morphology, and electrical properties was studied. The results were compared with the microcrystalline erbium oxide purchased from the market. The synthesized erbium oxide showed fiber like nanostructures. Dielectric properties at different sintering temperatures were measured in the frequency range 100 Hz to 5MHz. The synthesized erbium oxide had the highest dielectric constant at 650°C. The behavior of the dissipation factor tan δ for sol-gel synthesized material was distinct from that of the purchased material; it was higher at low frequencies and then decreased with the increase in frequency. The synthesized material sintered at different temperatures exhibited a similar sort of frequency-dependent response for permittivity ( ) and resistivity (ρ). This was in accordance with Koop’s theory of dielectrics. For the microcrystalline material, frequency dependence of permittivity and resistivity was not uniform. The results showed that sol-gel synthesized erbium oxide could be a good candidate for high-k applications.
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Fahad Azad,Asghari Maqsood 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.3
Nano crystalline erbium oxide (Er2O3) was synthesized in the laboratory through sol-gel method. The effect of different annealing temperatures on the crystal structure has been studied using x-ray diffraction (XRD). The comparison of the specific surface area (s); calculated using Brunauer, Emmett & Teller theory and (XRD) results, was made and found in agreement with an approximate error of 7%. The morphology of the samples has been studied using scanning electron microscope (SEM) and particles are found having a spherical morphology. Elemental analysis of the erbium oxide was also carried using energy dispersive spectrum (EDS) of the synthesized samples. Fourier transform infrared spectrum (FTIR) of the prepared samples showed the characteristic peaks for Er2O3. The dielectric properties of Er2O3 were also studied in the wide range of frequency (100 Hz - 5MHz). The activation energy for erbium oxide was found to be between 0.5 - 0.8 eV in the temperature range of 373 K - 573 K. Hall effect measurements were done on the synthesized erbium oxide and it was found that erbium oxide can have useful applications in the Hall effect sensors (HES).
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