JP Journal of Heat and Mass Transfer
Volume 18, Issue 2, Pages 379 - 403
(December 2019) http://dx.doi.org/10.17654/HM018020379 |
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STUDY OF THE PHYSICAL PROPERTIES OF FERRITE AND ITS APPLICATIONS
Saleem H. Trier
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Abstract: In this study, ferrite with cobalt content (x = 0, 0.3 and 0.5) was prepared by using the sol-gel auto-combustion method, and the powder was sintered at 600°C for 6 hours. The powder was analyzed using X-ray diffraction technique (XRD), one spinel phase showed one cubic for all samples and no impurity phase was observed and with crystalline sizes (49.959, 52.139 and 51.149)nm of pure and mixed nickel-ferrite, respectively. It confirmed that the replacement of cobalt ions leads to an increase in the lattice constants. The magnetic properties of the powder were studied using the vibrating sample magnetometer (VSM). The significant increase in magnetic saturation (Ms) was observed with a very narrow magnetic deceleration ring in the pure nickel-ferrite sample, offset by a small increase in coercion (Hc) and magnetic remnant (Mr). All magnetic parameters increase when the cobalt content is increased but the hysteresis loop is wider, and all the mentioned values decrease when the cobalt content is increased
It revealed that nanoparticles are magnetic materials with a coercive field of Hc = 600 Oe and magnetization saturation
The powder was compressed in the form of parallelogram (targets) and sintering at temperature 1100°C. The thin films of pure nickel-ferrite and mixed were prepared with deposition of the samples (targets) on glass substrates by pulsed laser (PLD) technique. Images of the scanning electron microscope (SEM) revealed decrease in the average granular size of thin films when increasing cobalt content. EDX spectra confirmed that these films are free from extraneous elements. The optical properties were studied by using UV-Vis spectra and the highest absorbance of the pure nickel-ferrite sample (40%) was in the ultraviolet region, and the transmittance of thin films ranged from (50-75)% in the visible region. It confirmed decreased dielectric constant and increased energy gap when increasing cobalt content. Finally, this study can contribute to understanding the benefits of ferrite films and its use in various applications in future studies. |
Keywords and phrases: sol-gel, Ni ferrite, PLD, magnetic properties.
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