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A Study of Synthesis of NiCuZn-Ferrite Sintering in Low Temperature by Metal Nitrates and its Electromagnetic Property
Journal of Magnetics, Volume 7, Number 2, 30 Jun 2002, Pages 29-39
Abstract
The initial NiCuZn synthetic ferrite were acquired from thermally decomposing the metal nitrates Fe(NO3)39H2O, Zn(NO3)26H2O, Ni(NO3)26H2O, and Cu(NO3)23H2O at 150℃ for 24 hours, and then we calcined the synthetic powder at 500℃, pulverized each of those for 3, 6, 9, 12, and 15 hours in a steel ball mill, sintered each at 700℃ to 1000℃ for 1 hour, and thus studied their microstructures and electromagnetic properties. We could make the initial specimens chemically bonded in liquidity at a low-temperature 150℃, by using the low melting points less than 200℃ of the metal nitrates instead of the mechanical ball-mill pulverization, then narrow a distance between the particles into a molecular one, and thus lower the reaction point of sintering by at least 200℃ to 300℃. Their initial permeability was 50 to 400 and their maximum magnetic induction density and coercive force, 2,400 G and 0.3 Oe to 0.5 Oe respectively, which was similar to those of NiZnCu ferrite synthesized in the conventional process. In the graph of initial permeability by frequencies, a 180° rotation of the magnetic domains which appears in a broad band of micro-wave before and after the resonance frequency, could be perceived.
Keywords: Thermal Decomposition of Metal Nitrates; Low Temperature Sintered NiCuZn Ferrite
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