Method for producing nanoparticles of magnetically hard ordered alloy phase
AssigneeFuji Photo Film Co., Ltd.
InventorsYasushi Hattori, Koukichi Waki
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Abstract
The invention provides methods for producing nanoparticles having a CuAu type or Cu3Au type magnetically hard ordered alloy phase. One method includes a step of reducing, in liquid phase, a base metal and then reducing, in liquid phase, a noble metal. Another method includes a step of reducing, in liquid phase, at first a base metal and a part of a noble metal, and then reducing, in liquid phase, a remainder of the noble metal in liquid phase.
Claims14
A method for producing nanoparticles having at least one of a CuAu type and Cu3Au type magnetically hard ordered alloy phase, the method comprising the step of
- reducing, in liquid phase, a base metal and then reducing, in liquid phase, a noble metal,
- wherein the reducing step includes:
- adding a reducing agent having an oxidation-reduction potential lower than −0.2 V to a solution including the base metal so as to reduce the base metal;
- then adding, after the reduction, the solution including the base metal to a solution including the noble metal to obtain a mixture;
- and adding a reducing agent having an oxidation-reduction potential equal to or higher than −0.2 V to the obtained mixture so as to reduce the noble metal.
A method for producing nanoparticles having at least one of a CuAu type and Cu3Au type magnetically hard ordered alloy phase, the method comprising the step of:
- reducing, in liquid phase, a base metal and a part of a noble metal, and then reducing, in liquid phase, the remainder of the noble metal,
- wherein the reducing step includes:
- adding a reducing agent having an oxidation-reduction potential lower than −0.2 V to a solution including the base metal and the noble metal so as to reduce the base metal and a part of the noble metal;
- and adding a reducing agent having an oxidation-reduction potential equal to or higher than −0.2 V to the obtained mixture so as to reduce the remainder of the noble metal.
A method for producing nanoparticles having at least one of a CuAu type and Cu3Au type magnetically hard ordered alloy phase, the method comprising the step of adding a reducing agent having at least one of S2O62−, H2PO2−, BH4−, N2H5+ and H2PO3− groups to a solution including a base metal to reduce the base metal, and then reducing, in liquid phase, a noble metal.
A method for producing a nanoparticles having at least one of a CuAu type and Cu3Au type magnetically hard ordered alloy phase, the method comprising the step of adding a reducing agent having at least one of S2O62−, H2PO2−, BH4−, N2H5+ and H2PO3− groups to a solution including a base metal and a noble metal to reduce the base metal and a part of the noble metal, and then reducing, in liquid phase, the remainder of the noble metal.
Dependencies are inferred from the claim text.