A new phase in stoichiometric Cu6Sn5

Wu, Y. Q., Barry, J., Yamamoto, T., Gu, Q. F., McDonald, S. D., Matsumura, S., Huang, H. and Nogita, K. (2012) A new phase in stoichiometric Cu6Sn5. Acta Materialia, 60 19: 6581-6591.


Author Wu, Y. Q.
Barry, J.
Yamamoto, T.
Gu, Q. F.
McDonald, S. D.
Matsumura, S.
Huang, H.
Nogita, K.
Title A new phase in stoichiometric Cu6Sn5
Formatted title A new phase in stoichiometric Cu6Sn5
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2012-11
Sub-type Article (original research)
DOI 10.1016/j.actamat.2012.08.024
Volume 60
Issue 19
Start page 6581
End page 6591
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2013
Language eng
Formatted abstract The intermetallic compound Cu6Sn5 is a significant microstructural feature of many electronic devices where it is present at the solder– substrate interfaces. The time- and temperature-dependent thermomechanical properties of Cu6Sn5 are dependent on the nature and stability of its crystal structure, which has been shown to exist in at least four variants (η, η′, η6 and η8). This research details an additional newly identified monoclinic-based structure in directly alloyed stoichiometric Cu6Sn5 using variable-temperature synchrotron X-ray diffraction (XRD) and transmission electron microscopy. The phase is associated with a departure from the equilibrium temperature of the polymorphic monoclinic–hexagonal transformation temperature. The new monoclinic phase can be treated as a modulation of four η8-Cu5Sn4 unit cells plus one η′-Cu6Sn5 unit cell. It has been labeled as η4+1 and has cell parameters of a = 92.241 Å, b = 7.311 Å, c = 9.880 Å and β = 118.95° determined from electron diffraction patterns. The XRD results could be fitted well to a Rietveld refinement using the new crystal parameters.
Keyword Cu6Sn5
Phase transformation
X-ray diffraction (XRD)
Electron diffraction pattern
Crystallography
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 17 September 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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Created: Sun, 14 Oct 2012, 12:17:57 EST by Professor Han Huang on behalf of School of Mechanical and Mining Engineering