Observation of body centered cubic Cu in Cu/Nb nanolayered composites Academic Article

abstract

• The deposition of thin alternating layers of Cu and Nb on Si(100) substrates has been studied by transmission electron microscopy as a function of layer thickness. For layer thickness above 25 , there is a strong texture orientation relationship with the close packed planes of fcc Cu parallel to close packed planes of bcc Nb, forming the so-called Kurdjumov-Sachs orientation relationship. However, at thicknesses of under 12 , the Cu is constrained to grow as a slightly distorted bcc structure. It is thought that, when it reaches a critical thickness between 12 and 20 , the bcc Cu loses coherency and transforms martensitically to the fcc phase, resulting in the observed KurdjumovSachs orientation relationship. Electron energy loss spectroscopy observations indicate a difference of 2 eV in the L3 edge suggesting that the Fermi energy is lower in the constrained bcc form of Cu than in the equilibrium fcc structure.

authors

• Nastasi, Michael

published proceedings

• Applied Physics Letters

author list (cited authors)

• Kung, H., Lu, Y., Griffin, A. J., Nastasi, M., Mitchell, T. E., & Embury, J. D.

complete list of authors

• Kung, H||Lu, Y-C||Griffin, AJ||Nastasi, M||Mitchell, TE||Embury, JD

publication date

• October 1997

publisher

• AIP Publishing  Publisher

published in

• Applied Physics Letters  Journal

keywords

• 40 Engineering
• 4016 Materials Engineering
• 51 Physical Sciences

Digital Object Identifier (DOI)

• 10.1063/1.119611

start page

• 2103

end page

• 2105

volume

• 71

issue

• 15

URL

• http://dx.doi.org/10.1063/1.119611