The alloy fine particles of the present invention are fine particles of a solid solution alloy, in which a plurality of metal elements are mixed at the atomic level. The production method of the present invention is a method for producing alloy fine particles composed of a plurality of metal elements. This production method includes the steps of (i) preparing a solution containing ions of the plurality of metal elements and a liquid containing a reducing agent; and (ii) mixing the solution with the liquid that has been heated.

The alloy fine particles of the present invention are fine particles of a solid solution alloy, in which a plurality of metal elements are mixed at the atomic level. The production method of the present invention is a method for producing alloy fine particles composed of a plurality of metal elements. This production method includes the steps of (i) preparing a solution containing ions of the plurality of metal elements and a liquid containing a reducing agent; and (ii) mixing the solution with the liquid that has been heated.

A metallic composite in which a conjugated compound having a molecular weight of 200 or more is adsorbed to a metallic nanostructure having an aspect ratio of 1.5 or more, for example, a metallic composite in which a compound having a group represented by the formula (I) or a repeating unit represented by the formula (II) or both of them is adsorbed to a metallic nanostructure having an aspect ratio of 1.5 or more, is useful for electronic devices such as a light-emitting device, a solar cell and an organic transistor.

A method of forming copper oxide nanopowder includes dissolving copper metal bulk in an acidic solution to form a copper-containing solution, wherein the acidic solution is sulfuric acid or nitric acid. The method includes adding an alkaline solution into the copper-containing solution to precipitate a solid. The method includes filtering, collecting, and drying the solid. The method includes calcinating the solid to obtain copper oxide nanopowder. When the acidic solution is sulfuric acid, the copper oxide nanopowder is a combination of long-bar shaped and sheet-shaped. When the acidic solution is nitric acid, the copper oxide nanopowder is short-bar shaped. The copper oxide nanopowder and an aqueous resin can be mixed to form an electrically insulating and thermally conductive film.

Disclosed are an anisotropic nanocrystalline rare earth permanent magnet and a preparation method thereof. The rare earth permanent magnet includes an RE-FeB matrix phase and a second phase, wherein the RE-FeB matrix phase includes main phase RE.sub.2Fe.sub.14B flaky nanocrystallines regularly arranged and an RE-rich phase around main phase grains, the main phase RE.sub.2Fe.sub.14B flaky nanocrystallines having an average grain size in a length direction of 70 nm to 800 nm and an average grain size in a thickness direction of 30 nm to 200 nm; and the second phase includes at least one selected from the group consisting of an M-Cu phase and an M-CuO phase, M being at least one selected from the group consisting of Ca and Mg.

An R-T-B sintered magnet of the present disclosure includes a principal phase that comprises an R.sub.2T.sub.14B compound and a grain boundary phase located in a grain boundary portion of the principal phase. The atomic ratio of B to T in the R-T-B sintered magnet is lower than the atomic ratio of B to T in the chemical stoichiometric composition of the R.sub.2T.sub.14B compound. The relationships 26.0 mass %[Nd]+[Pr]+[Ce]+[La]+[Dy]+[Tb])12 ([O]+[C])27.7 mass %, 0.85 mass %[B]0.94, 0.05 mass %[O][0.30] mass %, 0.05 mass %[M]2.00 mass %, [Tb]0.20 mass %, and [Dy]0.30 mass % are satisfied. A section is included in which at least the Nd concentration or the Pr concentration gradually decreases gradually from the front surface of the magnet toward the interior of the magnet.

In an aluminum alloy, Zn: 5.0-6.5 mass %, Mg: 2.0-3.0 mass %, and Cu: 1.2-2.0 mass % are contained; at least one element among three elements which are Ni: 2.0-5.0 mass %, Ag: 0.5-3.5 mass %, and Li: 0.1-0.4 mass % is contained; contained Si is 0.25 mass % or less and contained Mn is 0.25 mass % or less; remainder is composed of Al and an unavoidable impurity; and tensile strength is 650 MPa or greater. According to this aluminum alloy, an Al alloy with excellent surface treatment properties and high strength can be provided. Higher strength of an Al alloy can reduce product weight. Further, improvement in surface treatment properties can provide stable corrosion resistance and shorten product lead time.

An iron-based rare earth boron-based isotropic nanocomposite magnet alloy including: an alloy composition having a formula T.sub.100-x-y-z(B.sub.1-nC.sub.n).sub.xRE.sub.yZr.sub.zM.sub.m where T includes Fe, RE includes at least Nd, M is at least one of Al, Si, V, Cr, Ti, Mn, Cu, Zn, Ga, Nb, Mo, Ag, Hf, Ta, W, Pt, Au, and Pb, 4.2 atom %x5.0 atom %, 12.5 atom %y14.0 atom %, 0 atom %<z2.0 atom %, 0.0 atom %m5.0 atom %, and 0.0n0.5; and the magnet alloy includes a main phase having a RE.sub.2Fe.sub.14B tetragonal compound with a B content concentration lower than a stoichiometric composition of the RE.sub.2Fe.sub.14B tetragonal compound, and a grain boundary phase comprising a phase richer in Fe than the main phase surrounding the main phase, and the tetragonal compound is finer than a critical single-domain diameter of an average crystal grain size of 10 nm to less than 70 nm.

Disclosed are an anisotropic nanocrystalline rare earth permanent magnet and a preparation method thereof. The rare earth permanent magnet includes an RE-Fe-B matrix phase and a second phase, wherein the RE-Fe-B matrix phase includes main phase RE.sub.2Fe.sub.14B flaky nanocrystallines regularly arranged and an RE-rich phase around main phase grains, the main phase RE.sub.2Fe.sub.14B flaky nanocrystallines having an average grain size in a length direction of 70 nm to 800 nm and an average grain size in a thickness direction of 30 nm to 200 nm; and the second phase includes at least one selected from the group consisting of an M-Cu phase and an M-Cu-O phase, M being at least one selected from the group consisting of Ca and Mg.

A ribbon contains an alloy containing a rare earth element, iron, and boron. The ribbon has a surface R and a surface F located on a back side of the surface R. The surface R includes an amorphous region where only an amorphous phase of the alloy is exposed. The surface F includes a crystalline region where at least a crystalline phase of the alloy is exposed. The plurality of recesses are formed in the crystalline region. The surface R does not include the crystalline region where the plurality of recesses are formed.