Dielectric properties of M-type barium hexaferrite prepared by co-precipitation

Jesurani

Ramachandran

et al. 2011

Single-phase barium Strontium hexaferrite (Ba 0.5 Sr 0.5 Fe 12 O 19 -BSF) was synthesized by sol-gel method using metal nitrates as source and D-Fructose as a fuel. The phase formation, surface morphology and magnetic properties of the samples were analyzed by X-ray Diffraction, High-resolution Scanning Electron Microscope (HR-SEM) and Vibrating Sample Magnetometer (VSM). X-ray analysis indicates that the sintered samples were remained in hexagonal structure. The densities of the sintered samples at 1,150°C were found to be 93% of theoretical density. HR-SEM and VSM studies reveal that the sintered samples were resulted in hexagonal structure with good magnetic properties. The average diagonal of the grains varies from 0.95 to 1.7 lm. The thermal treatment effects the growth of the hexagonal grains of ferrites.

Section: Density Analysissupporting

confidence: 60%

Study of structural, morphological and magnetic properties of Ba0.5Sr0.5Fe12O19

Jesurani

Ramachandran

et al. 2011

“…It was observed that the density was improved by increasing the temperature from 1,000 to 1,150°C. The average density of the sample was 4.91 g/cm 3 which was achieved at 1,150°C for 3 h. This value compares favorably with the theoretical density of 5.30 g/cm 3 for this material [20]. Hence the density achieved using the sol-gel based route was found to be *93 % of the theoretical density.…”

Section: Methodssupporting

confidence: 60%

Sintering temperature dependence of optimized microstructure formation of BaFe12O19 using sol–gel method

Hashim

Kalaivani

et al. 2014

In an attempt to obtain the best possible properties of barium hexaferrite (BaFe 12 O 19 ), the sol-gel synthesis method was chosen and, the optimum sintering conditions were established. The effects of the sintering temperature on the structural, morphological and magnetic properties of hexaferrite were studied. X-ray analysis indicates that the sintered samples (1,000-1,150°C) remained in the hexagonal structure. From this analysis, no secondary phases are identified. The effect of sintering temperature on the grain growth of BaFe 12 O 19 is confirmed by the microstructure using HR-SEM and is in good agreement with the XRD analysis based on the peak intensity of the (107) plane. The samples sintered at 1,150°C showed the densities as *93 % of theoretical density. Sintering temperature affected the grains in compact samples. The results show that homogeneous and dense BaFe 12 O 19 ceramics obtained at a lower sintering temperature of 1,150°C which is lower than the normally reported sintering temperature of C1,200°C. The thermal treatment can markedly affect the grains in compact samples.

“…The sharpening and increase in intensity of peaks with the increase in sintering temperature can be correlated to the increase in the grain size and crystallinity of the microstructure. The peak intensity of XRD shows that the (107) plane increased continuously for the samples with increasing temperatures [11]. The result indicates the development of the density of the samples.…”

Section: Resultsmentioning

confidence: 79%

Study of morphological and magnetic properties of microwave sintered barium strontium hexaferrite

Jesurani

Ramachandran

et al. 2012

Magnetic materials are important electronic materials that have a wide range of industrial and commercial applications. Barium strontium hexaferrite (Ba 0.5 Sr 0.5 Fe 12 O 19 -BSF) were prepared by a sol-gel method using D-Fructose as fuel and the heat treatment was carried out in a microwave furnace. The effects of the sintering temperature on the morphology, crystalline structure and magnetic properties are studied. Sintering temperature affected the grains in compact samples. The sintered product possessed dense microstructure with clear micro grains and is in consistence with the XRD analysis based on the peak intensity of the (107) plane. Magnetic measurement shows that the barium strontium hexaferrite sample sintered at 1,150°C has the coercive field of 1,998 Gauss, remnant magnetization of 38.87 emu/g and the saturation magnetization of 53.44 emu/g.