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RISS 인기검색어
- 검색키워드
- 저자 : G. V. S. Murthy (검색결과 3 건)
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Modified Beach Placer Ilmenite: Dilute Magnetic Oxide
Nikhat Parveen,Davuluri Sindhura,G. V. S. Murthy 한국자기학회 2019 Journal of Magnetics Vol.24 No.3
Naturally-occurring Ilmenite ore is usually a mixture of Ilmenite (FeTiO₃) and hematite (Fe₂O₃). Synthesized solid solutions of Ilmenite and hematite are known to have interesting magnetic and electric properties. In the present study, we report that naturally occurring Ilmenite sintered with titanium dioxide also has low electrical resistivity and can be a natural resource for applications as electronic materials as envisaged for the system Ilmenite-hematite.
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M. Venkata Ramanaa,N. Ramamanohar Reddy,G. Sreenivasulu,K.V. Siva kumar,B.S. Murty,V.R.K. Murthy 한국물리학회 2009 Current Applied Physics Vol.9 No.5
Multiferroic particulate composites of Ni0.83Co0.15Cu0.02Fe1.9O4-δ – NCCF and lead zirconate titanate (PZT) were prepared conventional ceramic method. The generic formulae x NCCF + (1-x) PZT where x = 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 mole fractions. The presence of two phases in multiferroic was confirmed with XRD technique. The dielectric constant and loss tangent were studied as a function of frequency (100 Hz to 1 M Hz) and temperature (30–500 ℃). The piezoelectric coefficient d33 were also studied on these particulate composites. The hysteresis behaviour was studied to understand the magnetic properties such as saturation magnetization (Ms) and magnetic moment (μB). The static magnetoelectric (ME) voltage coefficient was measured as a function of dc magnetic bias field. A high value of ME output (3151 mV/Oe.cm) was obtained in the composite containing 50% highly magnetostrictive ferrite component NCCF – 50% highly piezoelectric ferroelectric component PZT. These multiferroic particulate composites are used as phase shifters, magnetic sensors, cables etc. Multiferroic particulate composites of Ni0.83Co0.15Cu0.02Fe1.9O4-δ – NCCF and lead zirconate titanate (PZT) were prepared conventional ceramic method. The generic formulae x NCCF + (1-x) PZT where x = 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 mole fractions. The presence of two phases in multiferroic was confirmed with XRD technique. The dielectric constant and loss tangent were studied as a function of frequency (100 Hz to 1 M Hz) and temperature (30–500 ℃). The piezoelectric coefficient d33 were also studied on these particulate composites. The hysteresis behaviour was studied to understand the magnetic properties such as saturation magnetization (Ms) and magnetic moment (μB). The static magnetoelectric (ME) voltage coefficient was measured as a function of dc magnetic bias field. A high value of ME output (3151 mV/Oe.cm) was obtained in the composite containing 50% highly magnetostrictive ferrite component NCCF – 50% highly piezoelectric ferroelectric component PZT. These multiferroic particulate composites are used as phase shifters, magnetic sensors, cables etc.
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Shim, J.,Venkata Reddy, Ch.,Sarma, G.V.S.S.,Narayana Murthy, P.,Ravikumar, R.V.S.S.N. Pergamon 2015 Spectrochimica acta. Part A, Molecular and biomole Vol.142 No.-
A simple co-precipitation method has been used for the synthesis of Co<SUP>2+</SUP> and Ni<SUP>2+</SUP>-doped zinc borate nanopowders. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV/Vis absorption, Scanning electron microscope (SEM) with EDS and photoluminescence (PL) spectroscopies techniques has been employed for their characterization. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic for both as-prepared samples. SEM images showed surface morphology of the prepared samples. Optical absorption spectra showed the characteristic bands of doped ions in octahedral site symmetry. From the optical absorption data crystal field and inter-electronic repulsion parameters are evaluated. The FT-IR spectra showed the characteristic vibrational bands related to ZnO, BO<SUB>3</SUB> and BO<SUB>4</SUB> molecules. Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.
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