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| AN EMPIRICAL RULE OF BINARY A-15 PHASES FORMATION AND THEIR T_c VARIATION |
| Shi Tiansheng; Zhang Hong and Zheng Longru (Shanghai Institute of Metallurgy; Academia Sinica) |
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Cite this article:
Shi Tiansheng; Zhang Hong and Zheng Longru (Shanghai Institute of Metallurgy; Academia Sinica). AN EMPIRICAL RULE OF BINARY A-15 PHASES FORMATION AND THEIR T_c VARIATION. Acta Metall Sin, 1981, 17(2): 225-227.
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Abstract The binary A-15 phases formation and their T_c variation have been studied by means of the bond-parametric diagram. It was ascertained that the A-15 phases locate in a definite region on the plot of electron density e/a vs radii ratio of components r_A/r_B. The A-15 phase cannot form any longer for the ratio r_A/r_B over a certain critical value which varies with e/a periodically. On the plot, the T_c distribution of A-15 Phases is shown with regularity. The A-15 phases with T_c higher than 1, 4.2, 10, 15 or 20 K are concentrated in the regions of corresponding isotherms. The ratio r_A/r_B, and e/a as well, may be important parameters in determining T_c. As compared with Matthias' rule, a better result in determining the location of A-15 phases of high T_c has been obtained by the consideration of both factors.
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Received: 18 February 1981
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