VARIATION OF SURFACE MORPHOLOGY OF TIN PARTICLES OBSERVED BY UHV HIGH-RESOLUTION TEM

Y. Oshima and K. Takayanagi
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Y. Oshima: Material Characterization Center, Fujitsu Laboratories Ltd., 10–1 Morinosato-Wakamiya, Atsugi 243–01, Japan
K. Takayanagi: Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 1199-1203

Abstract: Phase transition of fine tin particles with diameters 4–10 nm are studied by high-resolution transmission electron microscopy under an ultrahigh-vacuum condition. For the particles with diameter above 5 nm, the transformation from solid to liquid is sharp. The melting temperature,Tm, can be explained by Pawlow’s relation,Tm=T0−S/d(T0=213°C:bulk melting point, d: diameter,S=910°Cnm). However, the particles below 5 nm do not have the shape transformation like the large particles and are found to have a specific phase between the solid phase and the liquid phase. The critical particle size for this transformation,dc=5 nm, is believed to be related with surface morphology or surface melting; large solid particles have Wulff’s polyhedron. For smaller solid particles(d=5.5–6 nm), the (110) facets become slightly rounded. The solid particle belowdchas almost spherical surface, having irregular atomic arrangement of surface layer.

Date: 1996
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DOI: 10.1142/S0218625X96002163

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