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AssigneeNational Research Institute for Metals
InventorsIsao Nakatani, Kiyosho Ozawa, Masayuki Hijikata, Tsutomu Takahashi
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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.
A method of manufacturing a fine particle colloid of a metal nitride in non-aqueous solution, useful as a magnetic fluid, which comprises heating a non-aqueous solution containing a metal carbonyl and a surfactant dissolved therein while introducing a nitrogen containing compound into said non-aqueous solution, said heating being carried out at sufficient temperatures to effect a two step reaction in which metal carbonyl compound containing nitrogen is produced in the first step as a precursor and a second step in which a metal nitride is synthesized from said precursor.
A method of manufacturing a fine particle colloid of iron nitride in a non-aqueous solution, useful as a magnetic fluid, which comprises heating a non-aqueous solution containing iron carbonyl and a surfactant dissolved therein, introducing ammonia gas and effecting a two stage reaction in which (I) the reactant solution is heated at a temperature lower than 100.degree. C. to produce a metal carbonyl amino complex in a first stage reaction and (II) the metal carbonyl amino complex is dissociated at temperatures higher than 120.degree. C. to produce fine colloidal particles of iron nitride in a second stage reaction.
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