Elastic Constants and Quasi-elastic Central Peaks of Ferroelectric Lead Barium Niobate Single Crystals Studied by Brillouin Spectroscopy

2020 ◽  
Vol 76 (4) ◽  
pp. 352-355 ◽  
Author(s):  
Furqan Ul Hassan Naqvi ◽  
Jae-Hyeon Ko ◽  
Ki-Soo Lim
Keyword(s):  
Single Crystals ◽  
Elastic Constants ◽  
Brillouin Spectroscopy ◽  
Lead Barium Niobate

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.

Anomalous behaviors of elastic constants of lead-free piezoelectric (Na1/2Bi1/2)TiO3-5%BaTiO3 single crystals studied by Brillouin spectroscopy

2019 ◽  
Vol 126 (17) ◽  
pp. 174103
Author(s):  
Byoung Wan Lee ◽  
Jeong Woo Lee ◽  
Jae-Hyeon Ko ◽  
Xiaobing Li ◽  
Haosu Luo
Keyword(s):  
Single Crystals ◽  
Elastic Constants ◽  
Lead Free ◽  
Brillouin Spectroscopy

scholarly journals The Elastic Constants of the Single Crystal of the Mg-Zn-Zr-REM Alloy from the Data of the Elastic Anisotropy and the Texture of the Polycrystalline Sheet

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
S. V. San’kova ◽  
N. M. Shkatulyak ◽  
V. V. Usov ◽  
N. A. Volchok
Keyword(s):  
Single Crystals ◽  
Young’S Modulus ◽  
Elastic Constants ◽  
Elastic Anisotropy ◽  
Young's Modulus ◽  
Rare Earth Metals ◽  
Alloy Sheet ◽  
Pole Figures ◽  
Integral Characteristics ◽  
Experimental Values

The measuring of the constants of single-crystals requires the availability of crystals of relatively big size. In this paper the elastic constants of the single crystals of magnesium alloy with zinc, zirconium, and rare earth metals (REM) were determined by means of the experimental anisotropy of Young’s modulus and integral characteristics of texture (ICT), which were found from pole figures. Using these constants the anisotropy of Young’s modulus of alloy sheet ZE10 was calculated. Deviation of calculated values from experimental values did not exceed 2%.

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

Determination of the whole set of elastic constants of a polymeric Langmuir-Blodgett film by Brillouin spectroscopy

1989 ◽  
Vol 40 (5) ◽  
pp. 3323-3328 ◽  
Author(s):  
Fabrizio Nizzoli ◽  
Burkard Hillebrands ◽  
Sukmock Lee ◽  
George I. Stegeman ◽  
Gisela Duda ◽  
...  
Keyword(s):  
Elastic Constants ◽  
Brillouin Spectroscopy ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Film
Sign in / Sign up

Export Citation Format

Share Document