Mohsen Hakimi
Assistant Professor, Research and Technology of Magnetizm lab physics Department Yazd University, Yazd
[ 1 ] - The effect of preparation method and presence of impurity on structural properties and morphology of iron oxide
In this paper, the effect of the structural properties and morphology of iron oxide product, have been studied in co-precipitation and hydrothermal methods. Also, the effect of adding CCl4 impurities and final annealing of the materials is taken into account. The more homogeneous particle size in hydrothermal method has been explained by the effect of adding CCl4 as impurities to prevent the co...
[ 2 ] - ساخت نانوبلورهای فریت کبالت با بازپخت بین فلزی Co-Fe آلیاژسازی شده و مطالعه رفتار مغناطیسی آن
In this work, cobalt ferrite nanocrystallites were synthesized by air annealing of milled Co-Fe compound. Effect of annealing temperature on phase formation of cobalt ferrite and structural and magnetic properties of the product was studied. Analysis of annealed sample in 450 oC showed that around 46 weight percent of the specimen was changed to Co2FeO4. This value increased to 95 and 90% for 8...
[ 3 ] - Synthesis and Characterization of CoAl2O4 Nano Pigments by Polyol Method
Blue nano pigments of CoAl2O4 were successfully prepared by polyol method. Two different groups of materials containing chloride and acetate compounds were used to synthesis the nano pigments. The nano pigments were calcinated at 1100 °C. The CoAl2O4 nano pigments were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), dynamic li...
[ 4 ] - Comparison of the effect of Si and Ge presence on phase formation process, the structural and magnetic properties of Co2FeX (X=Ge,Si) Heusler compounds
In this study, the Co2FeX (X=Ge, Si) Heusler compounds with 30 valence electrons, which are made by using mechanical alloying and arc melting methods were studied. The crystallization of samples was confirmed by XRD data in both manufacturing methods. The results showed that the presence of Si than Ge in the compound played a more effective role to creation a large scale atomic ordering, and th...
[ 5 ] - Improving the Magnetic Properties Co2FeSi Heusler Compound by Modifying the Crystalline Order in Different Manufacturing Procedures
In this study, the improvement of the magnetic properties of Co2FeSi Heusler compound was followed by the utilization of different experimental synthesizing procedures. Comparing the crystal structure showed that the milled samples had a higher crystalline order than the arc-melted ones. Annealing of the milled sample improved the crystalline order, resulting in the highest saturation magnetiza...
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