-group and -group free-vibration resonance spectra obtained by EMAR at 290 K. Indices in the figure denote vibration modes identified by surface-displacement-distribution measurements by laser-Doppler interferometry.
A ring-down curve for the mode obtained by EMAR at 290 K. Solid line in the figure shows a least-squares fitting result of an exponential function to the measurements to determine the internal frictions of the mode .
Temperature dependence of elastic constants and bulk modulus of decagonal single QC. Open circles represent measurement points and solid curves show least-squares fitting results to Eq. (6) .
A relationship between and . The data plots include present decagonal and icosahedral , which we obtained previously (Ref. 27 ).
Elastic constants (GPa), bulk modulus (GPa), and acoustic Debye temperature (K) of the decagonal single QC obtained at 5 and 290 K.
Internal-friction-tensor components of the decagonal single QC obtained at 5 and 290 K. The longitudinal component in the -direction, , shows a notably high value, by about one order of magnitude, throughout the studied temperature range.
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