期刊
THIN SOLID FILMS
卷 407, 期 1-2, 页码 109-113出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0040-6090(02)00021-4
关键词
magnetisium; nanostructures; spinel; pulse power
Nanosize particles of nickel ferrite, NiFe2O4, have been successfully synthesized by pulsed wire discharge (PWD). In PWD, a simple circuit consisting of a capacitor and a gap switch drives the discharge. The wires of Ni and Fe were simultaneously discharged in a chamber filled with oxygen. The particles floating in the ambient gas were collected by pumping the gas through a membrane filter, and subjected to further analysis. The specific surface area of the particles were measured by the Brunauer-Emmet-Teller (BET) method. X-Ray diffraction showed the formation of NiFe2O4 and the inclusion of NiO. The NiO inclusion was estimated to be 18 vol.%. Magnetization hysteresis was measured for the particles synthesized at 600 torr. X-Ray diffraction and BET measurements reveal that particle size increases with increase in oxygen pressure. The saturation magnetization was found to be 33 emu/g for the particle with 45 nm in the size. (C) 2002 Elsevier Science B.V. All rights reserved.
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