High Saturation Induction for Bi-Substituted Yttrium Iron Garnet Prepared Via Sol Gel Technique

Abstract

Y 3.0-x Bi x Fe 5 O 12 samples (x = 0.2 and 0.4) were prepared via novel sol-gel and conventional solid-state techniques. The effect of bismuth in both techniques was investigated in terms of shrinkage, density, hysteresis and initial permeability. Sharp and clear diffraction XRD lines with highest peak appear at about 32° of the 2θ, for all the powders sintered at 900°C and 1250°C for both techniques. In evaluating the magnetic properties, it was observed that the saturation induction (1.1902kG) of sample prepared via sol-gel technique (Y 2.8 Bi 0.2 Fe 5 O 12 ) is more than 200% higher than sample with the same formula prepared via conventional technique. Fine grained microstructure with average grain size of about 5 µ m and higher shrinkage, about 11% were observed from the samples prepared via sol gel technique. It is concluded that samples prepared via sol gel technique appear to be an attractive route due to the possible reduction of cost of production and the enhanced magnetic and structural properties of the sample.

Tailoring structural and electrical properties of A-site non-stoichiometric Na0.5Bi0.5TiO3 ceramic at different sintering temperature

“…Some coalescence of grains with better connectivity at 1050°C and completely merge of grain boundaries at 1150°C is observed for NBT samples having excess of Na/Bi which may be attributed to liquid phase during sintering process due to melting of excess Bi 2 O 3 . The low melting point of Bi 2 O 3 (∼820°C) provide sintering aid by forming liquid phase and result in dense crystal growth as reported earlier [11,28-30]. Excess of Na and Bi on A-site seems to compensate high temperature loss of Na and Bi.…”

Cobalt Ferrite Nanoparticles: An Innovative Approach for Enhanced Oil Recovery Application

“…8). According to [23][24][25][26], Q-factor depends on the microstructure of ferrites for example pore size, grain size, and the presence of second phase.…”

“…The result also shows that the Q-factor increases as the frequency increases, but is starts to decrease at one point (Fig.8). According to [23][24][25][26], Q-factor depends on the microstructure of ferrites for example pore size, grain size, and the presence of second phase. …”

Carbon Nanotubes Fibres/Aluminium-NiZnFe2O4 Based Electromagnetic Transmitter for Improved Magnitude versus Offset (MVO) in a Scaled Marine Environment

“…10 11 One of the most popular non conventional methods is the sol-gel method. [12][13][14] Currently, the sol-gel method has been successfully used in the fabrication of magnetic nanoparticles that lead to the formation of ferrite particles having sizes between 10 to 100 nm. [2][3][4][5] Some new approaches have been adopted to reduce the sintering temperature of NiZn based ferrites: such as the addition of CuO and some other sintering aids.…”

“…[2][3][4][5] Some new approaches have been adopted to reduce the sintering temperature of NiZn based ferrites: such as the addition of CuO and some other sintering aids. [13][14][15][16] Carbon nanotubes have tremendous characteristics such as thermal, magnetic, electrical and mechanical. [18][19] Carbon nanotubes can be prepared to form different types of nanowires, nanoropes, nano fibers etc.…”