Abstract
The nanocomposites of x TiO2+(1-x)CoF2O4 (≤x≤1) powders were synthesized using microwave-hydrothermal method at a low temperature of 165°C/45min. The synthesized powder was characterized by using XRD, TEM, FTIR and DSC. The particle size was obtained from TEM study varies from 18nm to 34nm for all the nanopwders. DSC curve of composites shows no anatase to rutile phase transformation. As synthesized powder was densified using a microwave sintering method at 500°C/30min. In the XRD patterns of sintered composite samples, no peaks other than TiO2 and CoFe2O4 were observed. The grain sizes of the composites have been estimated from SEM pictures and they are in between 54 to 78nm. The dielectric properties were measured in the frequency range of 100 Hz to 1 MHz. The frequency variation of dielectric properties is understood with the help of Maxwell–Wagner type of interfacial polarization, which is in agreement with Koop’sphenomenological theory. The thermal variation of dielectric constant and loss studies were also undertaken at a constant frequency of 1kHz. Magnetic properties were also measured on all the composite samples at room temperature. The saturation magnetization (Ms) of the samples decreases with an increase of TiO2 content in CoFe2O4.
Highlights
A days, nano scaled magnetic particles are attracting more interest in the scientific community because of its functional applications in color imaging, catalysis [1], high density data storage [2], magnetically guided drug delivery [3], ferro-fluids [4] and magnetic-refrigeration systems [5]
The non-magnetic porosity nature of a titanium dioxide matrix favours the formation of magnetic crystals with nucleation sites, which will minimize the agglomeration phenomena, resulting in much finer and more homogeneous magnetic crystals [17, 18]
The phase identification and grain distribution of the sintered samples were identified by using x-ray diffraction (XRD) (PhilipsPW-1730 X-ray diffractometer) and Scanning Electron Microscope (SEM, LEICA, S440i, UK)
Summary
Nano scaled magnetic particles are attracting more interest in the scientific community because of its functional applications in color imaging, catalysis [1], high density data storage [2], magnetically guided drug delivery [3], ferro-fluids [4] and magnetic-refrigeration systems [5]. Fourier Transform Infrared spectra (FT-IR) were recorded using a Nicolet DTGS TEC detector spectrophotometer from 400 - 4000 cm-1 by the KBr pellet method in absorbance mode For this purpose, a 1mg of sample was thoroughly mixed with 150 mg of KBr in agate mortar and the mixture was pressed under vacuum to produce a thin disk. The phase identification and grain distribution of the sintered samples were identified by using XRD (PhilipsPW-1730 X-ray diffractometer) and Scanning Electron Microscope (SEM, LEICA, S440i, UK). The magnetic properties such as saturation magnetization (Ms) and coercive field (Hc) were obtained on the nanocomposites with the help of hysteresis loops recorded using Vibrating Sample Magnetometer (VSM, Model DMS 1660VSM) at room temperature. The thermal variation of dielectric constant and loss studies were undertaken at a constant frequency of 1kHz
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