Abstract:Copper-substituted Ni-Zn nanoferrite system having the composition of Ni 0.65 Zn 0.35−x Cu x Fe 2 O 4 (x = 0.00, 0.05, 0.10, 0.15, 0.20, 0.25) has been prepared by autocombustion method. Structural and magnetic characterizations were done on the as-prepared powders while the dc electrical conductivity measurements were studied on pellets sintered at 900 • C. X-ray diffraction measurements of all the samples showed a single spinel phase. The lattice parameter has been found to decrease with increasing Cu, and t… Show more
“…Several chemical methods have been developed to produce nanocrystalline ferrites, e.g., sol-gel [5,6], citrate precursor [7], co-precipitation [8], and microwave-assisted hydrothermal [9]. Among different dopants, nickel-zinc ferrites happen to be the most researched materials due to their remarkable magnetic properties such as large permeability at high frequency, remarkably high electrical resistivity, and low power loss [10][11][12][13].…”
Ultrasmall nanocrystalline NiSm 0.01 Fe 1.99 O 4 and Ni 1−x Zn x Sm 0.01 Ga 0.5 Fe 1.49 O 4 (x = 0.0, 0.3, 0.5) ferrites were synthesized by sol-gel method. The effect of Ga and Zn substitution on the particle size and structural and magnetic properties was investigated using X-ray diffraction patterns (XRD), transmission electron microscope (TEM), Mössbauer effect spectroscopy (ME), and vibrating sample magnetometer (VSM) techniques. XRD measurements suggest the formation of single-phase spinel ferrites with ultrasmall particles size ranging from 4 to 8 nm. Mössbauer effect measurements show a clear signature of superparamagnetism in the studied samples, where the reduced particle size causes the broadening of the Mössbauer spectra and the presence of a pronounced central doublet in all the measured samples. VSM measurements show a strong reduction of saturation magnetization due to size effects.
“…Several chemical methods have been developed to produce nanocrystalline ferrites, e.g., sol-gel [5,6], citrate precursor [7], co-precipitation [8], and microwave-assisted hydrothermal [9]. Among different dopants, nickel-zinc ferrites happen to be the most researched materials due to their remarkable magnetic properties such as large permeability at high frequency, remarkably high electrical resistivity, and low power loss [10][11][12][13].…”
Ultrasmall nanocrystalline NiSm 0.01 Fe 1.99 O 4 and Ni 1−x Zn x Sm 0.01 Ga 0.5 Fe 1.49 O 4 (x = 0.0, 0.3, 0.5) ferrites were synthesized by sol-gel method. The effect of Ga and Zn substitution on the particle size and structural and magnetic properties was investigated using X-ray diffraction patterns (XRD), transmission electron microscope (TEM), Mössbauer effect spectroscopy (ME), and vibrating sample magnetometer (VSM) techniques. XRD measurements suggest the formation of single-phase spinel ferrites with ultrasmall particles size ranging from 4 to 8 nm. Mössbauer effect measurements show a clear signature of superparamagnetism in the studied samples, where the reduced particle size causes the broadening of the Mössbauer spectra and the presence of a pronounced central doublet in all the measured samples. VSM measurements show a strong reduction of saturation magnetization due to size effects.
“…As the inter-atomic distance between the particles decreases, the cell volume and lattice parameter increase with increasing doping concentration. The size of the crystal decreases, which indicates that the crystallization steps is further improving [ 17 , 18 , 19 ]. Figure 1 A) X-ray diffraction pattern and B) Theta value (34–43) of a) undoped CuCr 2 O 4 b) 0.01, c) 0.02, and d) 0.03 La doped CuCr 2 O 4 .…”
“…In these two phases, electronic parameters of the material like inseries resistance -Rs, inparallel capacitance -Cp and inseries inductance -Ls were measured by the commercial one and with the fabricated meter. Figure 2 depicts Ni 0.65 Zn 0.35 Fe 2 O 4 is a ferro-magnetic pellet with 10mm in diameter and 0.65mm in thickness was considered for evaluation of fabricated impedance meter [10,13,16].…”
Impedance (Z) may be defined as the total opposition by a component (or electronic material) that offers to the AC (alternating current) at an applied signal frequency, parameters of impedance are utilized to analyze materials/electronic components characteristics. Impedance/LCR measuring instrumentation are costly or either do not enough accuracy and may have limited frequency range. There are many impedance measurement methods, each of which has their own pros and cons. While considering factors like frequency range, measurement band width, accuracy in measurement and its ease of operation, there is no single impedance measurement instrument that includes all these parameters. This research article describes a handy/portable impedance meter that depends on auto balancing bridge technique, which is capable of making impedance parameter measurements up to 20 Mhz frequency. An analog frequency generator was made up of max038 (IC) which stimulates the impedance measurement circuit that was composed of reference and also the impedances that are unknown. The applied frequency through the impedances (electronic materials) and their electronic parametrics like inseries inductance (Ls), inparallel capacitance (Cp) and inseries resistance (Rs) along with some sub-parameters were first digitalized and then displays. The fabricated impedance meter’s performance was analysed by correlating the results obtained by it, with the results of a commercially available impedance instrument-the Newton 4 th limited, NumetriQ, Model no. PSM-1735, for different composite electronic materials, some of them are multi-ferrites, ferroelectric and ferro-magnetic, materials. For every material, the error percentage was analysed; which is less than 3% was observed. In this paper, Ni0.65Zn0.35Fe2O4 -Ferro-magnetic material’s both thermal properties and electrical properties were analysed by fabricated and by the commercial instruments. Results are tabulated and then graphs are plotted.
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