scholarly journals Increase in elastic anisotropy of single crystal tungsten upon He-ion implantation measured with laser-generated surface acoustic waves

2016 ◽  
Vol 109 (15) ◽  
pp. 151906 ◽  
Author(s):  
R. A. Duncan ◽  
F. Hofmann ◽  
A. Vega-Flick ◽  
J. K. Eliason ◽  
A. A. Maznev ◽  
...  
Keyword(s):  
Ion Implantation ◽  
Single Crystal ◽  
Acoustic Waves ◽  
Elastic Anisotropy ◽  
Surface Acoustic Waves

LEAKY SURFACE ACOUSTIC WAVES IN SINGLE-CRYSTAL AlN SUBSTRATE

2004 ◽  
Vol 14 (03) ◽  
pp. 837-846 ◽  
Author(s):  
GANG BU ◽  
DAUMANTAS CIPLYS ◽  
MICHAEL S. SHUR ◽  
LEO J. SCHOWALTER ◽  
SANDRA B. SCHUJMAN ◽  
...  
Keyword(s):  
Single Crystal ◽  
Acoustic Waves ◽  
Electromechanical Coupling ◽  
Surface Acoustic Waves ◽  
Propagation Direction ◽  
Electromechanical Coupling Coefficient ◽  
Coupling Coefficients ◽  
Leaky Waves ◽  
Temperature Coefficient Of Frequency ◽  
Piezoelectric Constants

We report on the velocity V and the electromechanical coupling coefficient K2 of the first and the second leaky surface acoustic waves in various propagation directions in the a-plane AlN single-crystal. For c-propagation direction, the second leaky wave exhibited the velocity of 11016 m/s and K2 of 0.45%. For this direction, the temperature coefficient of frequency was found to be -30 ppm/°C. A near match of the velocities of the plane and leaky waves in the a-plane AlN allowed us to establish analytical relationships between the piezoelectric and elastic constants. A full set of elastic and piezoelectric constants of AlN has been evaluated by fitting the measured and calculated dependencies of velocities and electromechanical coupling coefficients on the propagation direction for both Rayleigh and leaky waves.

Single crystal elastic constants evaluated with surface acoustic waves generated and detected by lasers within polycrystalline steel samples

2016 ◽  
Vol 119 (4) ◽  
pp. 043103 ◽  
Author(s):  
D. Gasteau ◽  
N. Chigarev ◽  
L. Ducousso-Ganjehi ◽  
V. E. Gusev ◽  
F. Jenson ◽  
...  
Keyword(s):  
Single Crystal ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

Reflection of surface acoustic waves in the bulk of a hexagonal single crystal

2014 ◽  
Vol 56 (2) ◽  
pp. 373-375
Author(s):  
Yu. N. Gandurin ◽  
V. V. Kosachev
Keyword(s):  
Single Crystal ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

Electromechanical coupling coefficient for surface acoustic waves in single-crystal bulk aluminum nitride

2004 ◽  
Vol 84 (23) ◽  
pp. 4611-4613 ◽  
Author(s):  
G. Bu ◽  
D. Ciplys ◽  
M. Shur ◽  
L. J. Schowalter ◽  
S. Schujman ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Single Crystal ◽  
Coupling Coefficient ◽  
Acoustic Waves ◽  
Electromechanical Coupling ◽  
Surface Acoustic Waves ◽  
Electromechanical Coupling Coefficient ◽  
Crystal Bulk

Effective elastic constants and acoustic properties of single-crystal TiN/NbN superlattices

1992 ◽  
Vol 7 (8) ◽  
pp. 2248-2256 ◽  
Author(s):  
Jin O. Kim ◽  
Jan D. Achenbach ◽  
Meenam Shinn ◽  
Scott A. Barnett
Keyword(s):  
Single Crystal ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Mass Density ◽  
Surface Acoustic Waves ◽  
Dispersion Curves ◽  
Acoustic Properties ◽  
Tetragonal Symmetry ◽  
Cubic Symmetry ◽  
Effective Elastic Constants

Using the measured elastic constants of TiN and NbN single crystals with cubic symmetry, the effective elastic constants of single-crystal TiN/NbN superlattice films with tetragonal symmetry, namely c11, c12, c13, c33, c44, and c66 have been calculated for various thickness ratios of the layers. Using a line-focus acoustic microscope, measurements of surface acoustic waves (SAWs) have been carried out on single-crystal TiN/NbN superlattice films grown on the (001) plane of cubic crystal MgO substrates. The phase velocities measured as functions of the angle of propagation display the expected anisotropic nature of cubic crystals. Dispersion curves of SAWs propagating along the symmetry axes have been obtained by measuring wave velocities for various film thicknesses and frequencies. The SAW dispersion curves calculated from the effectiveelastic constants and the effective mass density of the superlattice films show very good agreement with experimental results. The results of this paper exhibit no anomalous dependence of the elastic constants on the superlattice period of TiN/NbN superlattices.

Attenuation of Surface Acoustic Waves by Carbon Nanotubes

2002 ◽  
Vol 750 ◽  
Author(s):  
Daumantas Ciplys ◽  
Sergey Rumyantsev ◽  
Michael S. Shur ◽  
Robert Vajtai ◽  
Bingqing Wei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Lithium Niobate ◽  
Single Crystal ◽  
Electric Fields ◽  
Acoustic Waves ◽  
Qualitative Agreement ◽  
Surface Acoustic Waves ◽  
Charge Carriers ◽  
Lithium Niobate Single Crystal

ABSTRACTA strong attenuation of surface acoustic waves in the range of 30 to 100 MHz by singlewalled carbon nanotube layers deposited on the surface of piezoelectric lithium niobate single crystal has been observed. The attenuation exhibits non-monotonous dependence on nanotube density. This attenuation is attributed to the acoustoelectronic interaction between electric fields of the SAW and charge carriers in the nanotubes. The experimental results are in the qualitative agreement with the theory of acoustoelectronic interaction in inhomogeneous structures.

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