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Anomalously high density and thermal stability of nanotwins in Ni(W) thin films: Quantitative analysis by x-ray diffraction

Published online by Cambridge University Press:  27 August 2014

S.J.B. Kurz ,
A. Leineweber  and
E.J. Mittemeijer
S.J.B. Kurz*
Affiliation:
Phase Transformations, Thermodynamics and Kinetics, Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research), D-70569 Stuttgart, Germany
A. Leineweber
Affiliation:
Phase Transformations, Thermodynamics and Kinetics, Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research), D-70569 Stuttgart, Germany
E.J. Mittemeijer
Affiliation:
Phase Transformations, Thermodynamics and Kinetics, Max Planck Institute for Intelligent Systems (formerly Max Planck Institute for Metals Research), D-70569 Stuttgart, Germany; and Institute for Materials Science, University of Stuttgart, D-70569 Stuttgart, Germany
*
a)Address all correspondence to this author. e-mail: s.kurz@is.mpg.de
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Abstract

Magnetron-sputtered Ni(W) films appear to possess a high density of nanotwins oriented parallel to the film surface which highly influences the properties of Ni(W) films. A sophisticated analysis method for describing the stacking sequence of close-packed atomic layers by statistical parameters has been developed which is based on the evaluation of intensity streaks in reciprocal space measured by (x-ray) synchrotron diffraction. In particular, the degree of hexagonality introduced by twinning into these ideally face-centered cubic-stacked films can be quantified. The validity of the proposed analysis has been confirmed by direct observation of the stacking sequences of close-packed layers using (high-resolution) transmission electron microscopy. It has been shown that the degree of hexagonality in the as-deposited state is practically proportional to the W content. Further, the thermal stability of the nanotwins increases with increasing W content which can be understood by the appearance of hexagonal close-packed-like domains exhibiting an intrinsic thermodynamic stability.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 15 , 14 August 2014 , pp. 1642 - 1655
Copyright
Copyright © Materials Research Society 2014 

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References

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