Elastic properties of TiN/(VxNb1-x)N superlattices measured by Brillouin scattering

P. B. Mirkarimi*, M. Shinn, S. A. Barnett, Sudha Kumar, M. Grimsditch

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Brillouin scattering measurements have been carried out on single-crystal lattice-matched TiN/(V0.6Nb0.4)N and mismatched TiN/NbN superlattices. Measured surface wave velocities were found to be independent of superlattice wavelength over the entire range investigated, 1.5-30 nm, and were averages of the measured velocities of pure homogeneous TiN, NbN, and (V 0.6Nb0.4)N. These results indicate that there is no anomaly in the C44 elastic constant. X-ray diffraction results from the superlattices indicated that the average lattice spacing did not vary with wavelength. This is consistent with previous observations where elastic anomalies were related to changes in lattice spacing. The absence of a correlation between the C44 elastic constant and previously reported hardness enhancements indicates that the latter are not caused by anomalies in C44; they could, however, be correlated with other elastic moduli.

Original languageEnglish (US)
Pages (from-to)4955-4958
Number of pages4
JournalJournal of Applied Physics
Volume71
Issue number10
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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