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The Debye temperature of nanocrystalline β–Sn measured by x-ray diffraction

Published online by Cambridge University Press:  03 March 2011

L.B. Hong ,
C.C. Ahn  and
B. Fultz
L.B. Hong
Affiliation:
Division of Engineering and Applied Science, 138-78, California Institute of Technology, Pasadena, California 91125
C.C. Ahn
Affiliation:
Division of Engineering and Applied Science, 138-78, California Institute of Technology, Pasadena, California 91125
B. Fultz
Affiliation:
Division of Engineering and Applied Science, 138-78, California Institute of Technology, Pasadena, California 91125
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Abstract

A nanocrystalline β–Sn film of 7 nm average grain size was prepared by inert gas condensation followed by ballistic consolidation, and was investigated by x-ray diffractometry at temperatures of 77 and 293 K. Although Sn normally undergoes a βα phase transformation at 286 K, this transformation was suppressed in the nanocrystalline film. Compared with large-grained β-Sn, a larger Debye–Waller factor and a lower Debye temperature were measured for nanocrystalline β-Sn; ΘD = 133 K for nanocrystalline material while ΘD = 161 K for large-grained material. The lower Debye temperature of the nanocrystalline β-Sn indicates that its vibrational entropy is increased by 0.6 kB/atom with respect to large-grained material.

Type
Rapid Communication
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2408 - 2410
Copyright
Copyright © Materials Research Society 1995

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