Elastic properties of transparent nano-polycrystalline diamond measured by GHz-ultrasonic interferometry and resonant sphere methods

Yun Yuan Chang*, Steven D. Jacobsen, Masaki Kimura, Tetsuo Irifune, Ichiro Ohno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The sound velocities and elastic moduli of transparent nano-polycrystalline diamond (NPD) have been determined by GHz-ultrasonic interferometry on three different bulk samples, and by resonant spectroscopy on a spherically fabricated NPD sample. We employ a newly-developed optical contact micrometer to measure the thickness of ultrasonic samples to ±0.05μm with a spatial resolution of ~50μm in the same position of the GHz-ultrasonic measurements, resulting in acoustic-wave sound velocity measurements with uncertainties of 0.005-0.02%. The isotropic and adiabatic bulk and shear moduli of NPD measured by GHz-ultrasonic interferometry are K S0 =442.5 (±0.5)GPa and G 0 =532.4 (±0.5)GPa. By rotating the shear-wave polarization direction, we observe no transverse anisotropy in this NPD. Using resonant sphere spectroscopy, we obtain K S0 =440.3 (±0.5)GPa and G 0 =532.7 (±0.4)GPa. For comparison, we also measured by GHz-ultrasonic interferometry the elastic constants of a natural single-crystal type-IA diamond with about one-half the experimental uncertainty of previous measurements. The resulting Voigt-Reuss-Hill averaged bulk and shear moduli of natural diamond are K S0 =441.8 (±0.8)GPa and G 0 =532.6 (±0.5)GPa, demonstrating that the bulk-elastic properties of transparent NPD are equivalent to natural single-crystal diamond as calculated from polycrystalline averaging of its elastic constants.

Original languageEnglish (US)
Pages (from-to)47-55
Number of pages9
JournalPhysics of the Earth and Planetary Interiors
Volume228
DOIs
StatePublished - Jan 1 2014

Keywords

  • Elastic properties
  • GHz-ultrasonic interferometry
  • NPD
  • Nano-polycrystalline diamond
  • Sphere resonance
  • Superhard materials

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

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