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Small particle melting of pure metalsSubmicron-sized crystallites of lead, tin, indium and bismuth were melted in situ in the modified specimen chamber of a Siemens transmission e lectron microscope. Melting point and size determinations were made directly from the dark field images of the crystallites. Particles exhibited melting points that decreased with decreasing particle size. A near-linear relationship was observed for the melting point as a function of the reciprocal of the radius. Thermodynamnic expressions based on the significant contributions of the surface energy to the free energy of the system also suggest a linear relation. Other factors, such as shape and surface contamination, were also observed to affect the size-dependent melting of particles. Crystallites of extended platelet shape did not exhibit a significant depression in melting point. Elevated residual gas pressures were found to lessen the melting point depression of spherical particles.
Document ID
19870036182
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Allen, G. L.
(Virginia Univ. Charlottesville, VA, United States)
Bayles, R. A.
(Virginia Univ. Charlottesville, VA, United States)
Gile, W. W.
(Virginia Univ. Charlottesville, VA, United States)
Jesser, W. A.
(Virginia, University Charlottesville, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Thin Solid Films
Volume: 144
ISSN: 0040-6090
Subject Category
Metallic Materials
Accession Number
87A23456
Funding Number(s)
CONTRACT_GRANT: NAG1-350
Distribution Limits
Public
Copyright
Other

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