FEATURES OF NICKEL FERRITE SYNTHESIS IN A SOLAR FURNACE
Keywords:
spinels, melt synthesis, ferrites, cobalt, nickel, fuel cell, magnetic hysteresis, catalystAbstract
Abstract. Introduction. The synthesis method plays an important role in obtaining a material with a given particle size, structure, microstructure and specific surface area, and phase stability. These parameters together determine certain properties. The main synthesis methods are solid-phase reactions, thermal decomposition, hydrothermal and solvothermal methods, co-precipitation, sol-gel and microwave processing. However, each method has its own advantages and disadvantages, and there is no optimal way to obtain high-quality ferrite materials from spinel. Therefore, the study of the structure and properties of nickel ferrite NiFe0O4, synthesized from a melt of a mixture of Fe2O3 + NiO in a solar furnace
Methods and materials. The mixture was ground in an agate mortar with the addition of ethyl alcohol (10 wt.%) and molded into tablets with a diameter of 12 mm and a height of 15 mm. The tablets were placed on a melting table located on the focal spot of a circle shaped with a diameter of 30 mm of the solar furnace. The melt was cooled by pouring into water. Hardened castings were ground, molded, and sintered at 1100°C.
Results. A single-phase material representing a cubic modification of nickel ferrite NiFe2O4 with a lattice parameter of 8.87 Å was obtained. The freshly synthesized material exhibited a soft magnetic character with parameters Hc=60 Oe, Ms=30 emu/g. While the material fired at 1100°C showed increased parameters Hc=80 Oe, Ms=50 emu/g.
Conclusion. The material obtained by synthesis from a melt in a solar oven can be used in catalytic processes of hydrogen synthesis by reforming organic raw materials due to its structure and magnetic parameters.
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