According to one embodiment, a tungsten wire includes a tungsten alloy containing rhenium. According to an EBSD analysis on a unit area, crystalline orientations having an orientation difference of 15 degrees or less from <101>, which is parallel to a wire drawing direction, account for an area ratio of 70% or more and 90% or less to a measurement field on an IPF map. The unit area is a 40 ?m?40 ?m area located within a range of 100 ?m concentrically extending from a central axis in a cross-section along a wire radial direction, which is perpendicular to the wire drawing direction.

A compressed stranded conductor includes a central stranded wire having a plurality of conductive strands which are twisted together and an outer circumferential stranded wire having a plurality of conductive strands which are twisted together at an outer circumference of the central stranded wire. A composite stranded wire configured by the central stranded wire and the outer circumferential stranded wire is compressed, and an occupancy ratio of the composite stranded wire is 90.2% or more and 91.0% or less.

An ultra high temperature mineral-insulated shielded cabled is provided as a non-sintered compacted powder, where central conductors and/or a sheath are made of a conducting material selected from tantalum, tungsten, rhodium, rhenium, carbon, and a mixture of at least two of such materials. The mineral insulator is made of an insulating material selected from boron nitride, yttrium oxide, silicon nitride, aluminium nitride, and a mixture of such materials. The conductor is tantalum and the insulator is selected from hafnia, boron nitride, silicon nitride, and a mixture of such materials, in particular for a use at a temperature lower than 1 630? C. or 1 600? C.; or aluminium nitride, in particular at a temperature lower than 1 530? C. or 1 500? C. A device including this cable used below 1800? C., particularly under 1 600? C., in particular under vacuum, as a heating element or transmission cable.

Highly uniform and thin silver nanowires are described having average diameters below 20 nm and a small standard deviation of the diameters. The silver nanowires have a high aspect ratio. The silver nanowires can be characterized by a small number of nanowires having a diameter greater than 18 nm as well as with a blue shifted narrow absorption spectrum in a dilute solution. Methods are described to allow for the synthesis of the narrow uniform silver nanowires. Transparent conductive films formed from the thin, uniform silver nanowires can have very low levels of haze and low values of L*, the diffusive luminosity, such that the transparent conductive films can provide little alteration of the appearance of a black background.

Highly uniform and thin silver nanowires are described having average diameters below 20 nm and a small standard deviation of the diameters. The silver nanowires have a high aspect ratio. The silver nanowires can be characterized by a small number of nanowires having a diameter greater than 18 nm as well as with a blue shifted narrow absorption spectrum in a dilute solution. Methods are described to allow for the synthesis of the narrow uniform silver nanowires. Transparent conductive films formed from the thin, uniform silver nanowires can have very low levels of haze and low values of L*, the diffusive luminosity, such that the transparent conductive films can provide little alteration of the appearance of a black background.

Highly uniform and thin silver nanowires are described having average diameters below 20 nm and a small standard deviation of the diameters. The silver nanowires have a high aspect ratio. The silver nanowires can be characterized by a small number of nanowires having a diameter greater than 18 nm as well as with a blue shifted narrow absorption spectrum in a dilute solution. Methods are described to allow for the synthesis of the narrow uniform silver nanowires. Transparent conductive films formed from the thin, uniform silver nanowires can have very low levels of haze and low values of L*, the diffusive luminosity, such that the transparent conductive films can provide little alteration of the appearance of a black background.

In a wire drawing method, processing stability is ensured by preventing a shape from deforming non-uniformly. The wire drawing method includes: using a first wire that includes a center member, a plurality of first peripheral wires surrounding the center member, and an outer shell disposed outside the first peripheral wires; and reducing a cross-sectional diameter of the first wire by wire drawing. A shape of a cross section perpendicular to a longitudinal direction of the first peripheral wire is a substantially isosceles trapezoidal shape including a long side in contact with the outer shell, a short side in contact with the center member, and a first oblique side and a second oblique side that are in contact with the adjacent peripheral wires.

An assembly conductor manufacturing method includes aligning, around a center strand, a plurality of peripheral strands, each having at least two side surfaces, one of which opposes an adjacent peripheral strand on one side in a circumferential direction and the other of which opposes an adjacent peripheral strand on the other side in the circumferential direction, so as to form an assembly conductor in which the center strand and the peripheral strands are aligned; twisting the plurality of peripheral strands around the center strand that forms the assembly conductor; and plastic forming the twisted assembly conductor into a substantially rectangular sectional shape. The peripheral strand provided with the two side surfaces has a sectional shape in which a width between the side surfaces becomes narrower toward the center strand.

A method of manufacturing an assembled conductor includes: arranging a plurality of peripheral wires having anisotropic cross-sectional shapes around a central wire; bundling the central wire and the peripheral wires that have been arranged, to form a conducting wire bundle; and rolling the conducting wire bundle to form the assembled conductor. The arranging includes a bending process for bending the plurality of peripheral wires in directions along imaginary lines that extend radially relative to an axis of the central wire on an imaginary plane intersecting the axis of the central wire.

A method for forming a multilayer composite structure comprises providing a first sheet comprising a copper-comprising layer sandwiched by first and second graphene layers, wrapping the first sheet to form a first rod, and compacting the first rod to form a first multilayer composite structure.