We have investigated the melting behavior of thin lead wires using molecular dynamics. We find thatin analogy with cluster meltingthe melting temperature Tm(R) of a wire with radius R is lower than that of a bulk solid Tmb by Tm(R)=Tmb-c/R. Surface melting effects, with formation of a thin skin of highly diffusive atoms at the wire surface, are observed. The diffusivity is lower over (111)-oriented faces, and higher at (110) and (100) rounded areas. The possible relevance to recent results on nonrupturing thin necks between a scanning tunnel microscope tip and a warm surface is addressed.
Premelting of thin wires / Gulseren, O.; Ercolessi, F.; Tosatti, Erio. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - 51:11(1995), pp. 7377-7380. [10.1103/PhysRevB.51.7377]
Premelting of thin wires
Tosatti, Erio
1995-01-01
Abstract
We have investigated the melting behavior of thin lead wires using molecular dynamics. We find thatin analogy with cluster meltingthe melting temperature Tm(R) of a wire with radius R is lower than that of a bulk solid Tmb by Tm(R)=Tmb-c/R. Surface melting effects, with formation of a thin skin of highly diffusive atoms at the wire surface, are observed. The diffusivity is lower over (111)-oriented faces, and higher at (110) and (100) rounded areas. The possible relevance to recent results on nonrupturing thin necks between a scanning tunnel microscope tip and a warm surface is addressed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.