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Surface Melting (faceting?)

Surface Melting (faceting?). Sergio Calatroni. Surface Melting. (110) -> 1270 K (1000 C) (100) -> 1290 K (1020 C) (111) -> 1310 K (1040 C). Bulk fusion -> Lindemann criterion: rms thermal vibration amplitude of the solid reaches some 14% of the nearest-neighbour distance.

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Surface Melting (faceting?)

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  1. Surface Melting(faceting?) Sergio Calatroni

  2. Surface Melting (110) -> 1270 K (1000 C) (100) -> 1290 K (1020 C) (111) -> 1310 K (1040 C) Bulk fusion -> Lindemann criterion: rms thermal vibration amplitude of the solid reaches some 14% of the nearest-neighbour distance. In a surface atoms are closer together than in bulk -> lower melting point Sergio Calatroni

  3. Stress effect Sergio Calatroni

  4. Cluster size effect Sergio Calatroni

  5. MD from Kai Nordlund 2 ns ~10 nm Sergio Calatroni

  6. Faceting • Faceting happens: • Vacuum 1040 C • Does not happen: • 1 bar H2 SLAC 1040 C • 1 mbar H2 CERN 1040 C • 10 mbar H2 CERN 850 C What orientations? Sergio Calatroni

  7. Hydrogen + Cu P = 500 bar! +H 1083 C (Cu)+H / L+H +H Missing info: effect of H2 on surface melting Sergio Calatroni

  8. Hydrogen solubility in Cu 90 bar 0.2% liquid solid 1600K 1356K 1356K 1000K 700 K CERN SLAC Sergio Calatroni

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