Formation of metastable solid solutions in the Pb-Ge system

Akhtar, Dilshad ; Goel, T. C. ; Vankar, V. D. ; Chopra, K. L. (1980) Formation of metastable solid solutions in the Pb-Ge system Journal of Materials Science, 15 (11). pp. 2720-2728. ISSN 0022-2461

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The formation and decomposition behaviours of metastable solid solutions in liquid-quenched and vapour-quenched Pb-Ge alloys were studied using X-ray diffraction, transmission electron microscopy (TEM), differential thermal analysis (DTA) and resistance measurement techniques. It is shown that the Pb-rich fcc phase can retain upto about 13 at% Ge on liquid-quenching and upto about 5 at% Ge on vapour-quenching. Decomposition of the Pb-rich fcc phase occurs in the temperature range 220 to 300° C and it is a temperature dependent nucleation and growth phenomenon. Upto about 7.5 at% Pb can be retained in Ge-rich compositions in an amorphous Ge matrix on vapour-quenching but there is no detectable solubility of Pb in crystalline Ge retained by liquid-quenching. On heating, the amorphous Ge-Pb films crystallize to a Ge-rich solid solution which decomposes to equilibrium constituents at higher temperatures. Stability of amorphous Ge-Pb films decreases on increasing metal concentration.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:23258
Deposited On:25 Nov 2010 09:33
Last Modified:28 May 2011 06:52

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