Determination of the elastic constants of single crystals of fcc and hcp argon alloys by Brillouin scattering

1982 ◽  
Vol 26 (8) ◽  
pp. 4239-4261 ◽  
Author(s):  
S. F. Ahmad ◽  
H. Kiefte ◽  
M. J. Clouter ◽  
M. D. Whitmore
Keyword(s):  
Single Crystals ◽  
Elastic Constants ◽  
Brillouin Scattering

Brillouin-scattering determination of the elastic constants of epitaxial fccC60film

1995 ◽  
Vol 52 (12) ◽  
pp. R8707-R8710 ◽  
Author(s):  
D. Fioretto ◽  
G. Carlotti ◽  
G. Socino ◽  
S. Modesti ◽  
C. Cepek ◽  
...  
Keyword(s):  
Elastic Constants ◽  
Brillouin Scattering

The elastic constants of silicon carbide: A Brillouin-scattering study of 4H and 6H SiC single crystals

1997 ◽  
Vol 82 (6) ◽  
pp. 3152-3154 ◽  
Author(s):  
K. Kamitani ◽  
M. Grimsditch ◽  
J. C. Nipko ◽  
C.-K. Loong ◽  
M. Okada ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Single Crystals ◽  
Elastic Constants ◽  
Brillouin Scattering ◽  
Scattering Study

Elastic and photo-elastic constants of CH4 and CD4 obtained by Brillouin scattering

1982 ◽  
Vol 60 (3) ◽  
pp. 287-298 ◽  
Author(s):  
S. C. Rand ◽  
B. P. Stoicheff
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Elastic Constants ◽  
Brillouin Scattering ◽  
Low Frequency ◽  
Mass Ratio ◽  
Translational Coupling ◽  
Brillouin Spectroscopy ◽  
Transverse Modes ◽  
Triple Points

The elastic constants and Pockels coefficients of CH4 and CD4 single crystals near their triple points have been determined using high-resolution Brillouin spectroscopy. For CH4 at 90.4 K, the elastic constants are C11 = 19.57 ± 0.30, C12 = 14.46 ± 0.20, C44 = 9.20 ± 0.15 kbar, and the ratios of the Pockels coefficients are p12/p11 = 1.031 ± 0.035 and p44/p11 = 0.069 ± 0.010. For CD4 at 89.2 K, C12 = 20.04 ± 0.30, C12 = 15.00 ± 0.25, C44 = 9.15 ± 0.15 kbar, and p12/p11 = 1.027 ± 0.020, P44/p11 = 0.138 ± 0.010. The velocities of the low-frequency transverse modes in CH4 and CD4 are anomalously slow in the [Formula: see text] direction, indicative of rotational–translational coupling of molecules. Isotopic differences are also evident: the Pockels coefficient p44 in CD4 is double that in CH4; and the velocities of both transverse modes in the principle directions [Formula: see text], [Formula: see text], and [Formula: see text] are in the ratio V(CH4)/V(CD4) = 1.130 instead of 1.118 as expected from the isotopic mass ratio.

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