Compositions – Magnetic – Chromium or chromium compound containing
Patent
1991-04-12
1993-01-19
Langel, Wayne
Compositions
Magnetic
Chromium or chromium compound containing
252309, 422198, 423409, B01J 1300, C01B 2106, H01F 100
Patent
active
051805120
ABSTRACT:
A method of manufacturing a fine-particle colloid or a magnetic fluid of a metal nitride through reaction between a metal carbonyl and a nitride-bearing compound, a two-step reaction is performed, comprising a first-step reaction of synthesizing a nitrogen-bearing metal carbonyl which is a precursor substance and a second-step reaction of synthesizing metal nitride from said precursor substance. A step of eliminating unreacted metal carbonyl is provided between the two-step reaction. By repeatedly causing the series of reactions, a fine-particle colloid or a magnetic fluid of the metal nitride is manufactured. For the magnetic fluid, the solvent may be replaced in response to a particular purpose of use of application after production.
REFERENCES:
patent: 2872292 (1959-02-01), Altmann
Nakatani et al., "Iron-Nitride Magnetic Fluids Prepared by Plasma CVD Technique and Their Magnetic Properties", Journal of Magnetism and Magnetic Materials 85 (1990) 11-13.
Nakatani et al., "Preparation and Magnetic Properties of Colloidal Ferromagnetic Metals", Journal of Magnetism and Magnetic Materials 65 (1987) 261-264.
Hijikata Masayuki
Nakatani Isao
Ozawa Kiyosho
Takahashi Tsutomu
Langel Wayne
National Research Institute for Metals
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