Фазовая диаграмма системы Au-Nb

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Au-Nb (Gold-Niobium) H. Okamoto and T.B. Massalski The equilibrium phases of the Au-Nb system are (1) the liquid, L; (2) the fcc terminal solid solution, (Au), with a solid solubility of 57 at.% Nb in (Au); ( 3) the bcc terminal solid solution, (Nb), with a solid solubility of 36 at.% Au in (Nb); (4) the AlB2-type intermetallic compound Au2Nb; (5) the intermetallic compound Au2Nb3, with tetragonal crystal symmetry; and (6) the fluorite-type intermetallic compound AuNb3, with a homogeneity range of about 10 at.%. The assessed phase diagram for the Au-Nb system is based mainly on the work of [73Ros]. The smoothed liquidus and solidus in the present diagram have been calculated using a thermodynamic model. The superconducting transition temperature of the Nb terminal solid solution, ( Nb), decreases uniformly from 9.25 K for pure Nb to about 1.2 to 1.5 K at 75 at.% Nb with increasing Au concentration. 73Ros: E. Roschel, C.J. Raub, and O. Loebich, Jr., Z. Metallkd., 64(5), 359- 361 (1973) in German. Published in Phase Diagrams of Binary Gold Alloys, 1987, and Bull. Alloy Phase Diagrams, 6(2), Apr 1985. Complete evaluation contains 1 figure, 4 tables, and 16 references. Special Points of the Au-Nb System