Aluminum superconducting properties

Titanium-aluminum-niobium alloys have been developed for biocompatible, high-strength surgical implants (Semlitsch et al. 1985), while metal-resin composites containing niobium as filler have potential use as restorative materials in dentistry (Misra and Bowen 1977). The metal possesses superior superconductive properties in strong magnetic fields, which may be... 

Niobium is a soft grayish-silvery metal that resembles fresh-cut steel. It is usually found in minerals with other related metals. It neither tarnishes nor oxidizes in air at room temperature because of a thin coating of niobium oxide. It does readily oxidize at high temperatures (above 200°C), particularly with oxygen and halogens (group 17). When alloyed with tin and aluminum, niobium has the property of superconductivity at 9.25 Kelvin degrees. 

Aluminum oxide, as stabilizer, 296 Anderson model of superconductivity, 2 Anisotropic conduction, oxides, 40 Anisotropic GL theory, to ana superconductors. 19 Ann type, effect on cell parameters and magnetic properties, 142 Annealing parameters, films, 238,24(y Applications, BCS theory of superconductivity, 114 Argon laser-etched patterns, thin films, 257-25Atomic structure LajCuO, 27,2, 29 orthorhombic Y-Ba-Oi-0,27,2 ... 

Figures Ic and Id show no advantage for boron-aluminum over boron-epoxy. There are some cryogenic applications, however, where a high electrical conductivity and a strong, stiff structure are required, e.g., in eddy-current shields in rotating superconducting machinery. The high thermal conductivity of boron-aluminum limits its cryogenic applications. The excellent properties and low property variability observed with boron-epoxy were also observed for boron-6061 aluminum at 4 K [ ].

Superconducting rotors for the experiments were made of either solid niobium or lead-plated sapphire, plastic, aluminum, or magnesium spheres. The spheres were plated either by electrochemical deposition or vacuum deposition. Tests have indicated that these methods can be refined to produce properties similar to the parent material. 

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