A molecular-dynamics analysis of local disorder on Al(110) surface near the melting point has been performed. Premelting process has been studied calculating the surface extended X-ray absorption fine structure (SEXAFS) Debye-Waller factor which has an anisotropical behaviour above 800 K for the range of temperatures up to the melting point. Theoretical results have been compared with recent SEXAFS measurements. The calculations show that bonds between Al atoms , for temperatures higher than 800 K, are broken along the direction normal to the surface, while they remain intact on the surface. A loss of coordination number is present as an evidence of structural disorder for temperatures near melting. -- Presentazione poster by R. Zivieri - Conferenza internazionale
Premelting of Al(110) surface from a local perspective -- Presentazione poster by R. Zivieri - Conferenza internazionale
ZIVIERI, Roberto;
1999
Abstract
A molecular-dynamics analysis of local disorder on Al(110) surface near the melting point has been performed. Premelting process has been studied calculating the surface extended X-ray absorption fine structure (SEXAFS) Debye-Waller factor which has an anisotropical behaviour above 800 K for the range of temperatures up to the melting point. Theoretical results have been compared with recent SEXAFS measurements. The calculations show that bonds between Al atoms , for temperatures higher than 800 K, are broken along the direction normal to the surface, while they remain intact on the surface. A loss of coordination number is present as an evidence of structural disorder for temperatures near melting. -- Presentazione poster by R. Zivieri - Conferenza internazionaleI documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
