Phase transitions in wetting films at the surface of Ga–Pb alloys |
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Authors: | Cyril Calmes Donatella Giuranno Dominique Chatain |
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Affiliation: | 1.CNRS, Aix-Marseille University,Marseille,France;2.Centre Microélectronique de Provence Georges Charpak,Ecole Nationale Supérieure des Mines de Saint Etienne,Gardanne,France;3.Istituto per l’Energetica e le Interfasi - CNR,Genoa,Italy |
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Abstract: | Surface phase transitions at Ga-rich liquid surfaces have been investigated in Ga–Pb alloys with low lead content. In the
region of the liquid–liquid miscibility gap, the Pb-rich liquid phase completely wets the surface of the Ga-rich phase at
coexistence. Observations have been made of demixing and solidification of the Pb-rich liquid film. Ga-rich alloys, which
are single-phase below the monotectic temperature, can be undercooled below the liquidus, as far as the metastable binodal
line where the Pb-rich wetting liquid film forms and solidifies into thin {111} Pb crystals. These films completely redissolve
upon reheating to the liquidus temperature. Freezing occurs at surfaces because of complete wetting of the liquid rich in
the high melting point component and the hysteretic character of the solidification transformation. Such “surface” experiments
allow assessment of the stable and metastable liquidus lines of the Ga–Pb phase diagram in the vicinity of the monotectic
temperature. |
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