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The metastable system Ga–Al and the atomic volume of twelvefold coordinated Ga
Author(s) -
Giessen B. C.,
Wolff U.,
Grant N. J.
Publication year - 1968
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889868004966
Subject(s) - metastability , volume (thermodynamics) , materials science , crystallography , chemistry , physics , thermodynamics , organic chemistry
While Ga and Al do not form extended solid solutions in equilibrium, metastable single phase Ga–Al alloys were prepared by rapid quenching from the melt to −1190°C (splat cooling), yielding a wide extension of the Al‐rich solid solution α; at higher Ga contents, this phase is followed by a tetragonal phase α′. Another metastable phase rich in Ga was also observed. The mean atomic volumes of α and α′ permit a quadratic extrapolation to pure Ga, for which V (Ga) = 18.27 Å 3 at −190°C. The solid solution formation and the structural instability of the cubic and tetragonal phases α and α′ are discussed in terms of pseudopotential theory; the analogy of α′ to a high‐pressure phase of Ga has been noted.