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Phase transitions in wetting films at the surface of Ga–Pb alloys

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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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Acknowledgements

The authors acknowledge support by the COOLCOP project of the European Space Agency. They also thank Prof. Paul Wynblatt for helpful discussions.

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Author notes

  1. Cyril Calmes

    Present address: Centre Microélectronique de Provence Georges Charpak, Ecole Nationale Supérieure des Mines de Saint Etienne, 880 route de Mimet, 13541, Gardanne, France

  2. Donatella Giuranno

    Present address: Istituto per l’Energetica e le Interfasi - CNR, Via de Marini, 6, 16149, Genoa, Italy

Authors and Affiliations

  1. CNRS, Aix-Marseille University, CINAM-UPR3118, campus de Luminy, 13288, Marseille, France

    Cyril Calmes, Donatella Giuranno & Dominique Chatain

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  1. Cyril Calmes
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  2. Donatella Giuranno
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  3. Dominique Chatain
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Correspondence to Dominique Chatain.

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Calmes, C., Giuranno, D. & Chatain, D. Phase transitions in wetting films at the surface of Ga–Pb alloys. J Mater Sci 44, 5949–5959 (2009). https://doi.org/10.1007/s10853-009-3563-z

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  • DOI: https://doi.org/10.1007/s10853-009-3563-z

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