Surface and Bulk Wave Velocities in Arbitrary Anisotropic Piezoelectric Materials

1983 ◽  
Author(s):  
E. Langer ◽  
S. Selberherr ◽  
P.A. Markowich
Keyword(s):  
Piezoelectric Materials ◽  
Bulk Wave ◽  
Wave Velocities

scholarly journals Bulk Wave Velocities in Cortical Bone Reflect Porosity and Compression Strength

2020 ◽  
Author(s):  
Laura Peralta ◽  
Juan Deyo Maeztu Redin ◽  
Fan Fan ◽  
Xiran Cai ◽  
Pascal Laugier ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Compression Strength ◽  
Bulk Wave ◽  
Wave Velocities

How Can Be Realized High Piezoelectricity from Measuring Acoustic Wave Velocities ?

2014 ◽  
Vol 90 ◽  
pp. 33-42
Author(s):  
Toshio Ogawa
Keyword(s):  
Acoustic Wave ◽  
Wave Velocity ◽  
Piezoelectric Materials ◽  
Piezoelectric Ceramics ◽  
Measuring Method ◽  
Lead Free ◽  
Material Research ◽  
Thickness Gauge ◽  
Wave Velocities ◽  
Lead Free Ceramics

Material research and development on piezoelectric ceramics, especially lead-free ceramics, was proposed from a viewpoint of relationships between piezoelectricity and elastic constants such as Young’s modulus and Poisson’s ratio. We developed a method to be convenient to measure acoustic wave velocities by an ultrasonic thickness gauge with high-frequency. From the change in longitudinal and transvers wave velocities before and after DC poling, it was found that the ceramic bulk density was important to improve the piezoelectricity in lead-free ceramics. As a result, the candidates of lead-free ceramic compositions with higher piezoelectricity were proposed. Furthermore, the ratio of transvers wave velocity to longitudinal wave velocity was clarified to estimate compositions with higher piezoelectricity. The measurement of sound velocities was an effective method for researching and developing piezoelectric materials, and it was possible to design the material compositions of lead-free piezoelectric ceramics as well as lead-containing ceramics by the novel measuring method.

The mathematical modeling for bulk acoustic wave propagation velocities in transversely isotropic piezoelectric materials

2015 ◽  
Vol 22 (4) ◽  
pp. 823-836 ◽  
Author(s):  
Abo-el-nour N Abd-alladan ◽  
Abdelmonam M Hamdan ◽  
Adel A Almarashi ◽  
Antonio Battista
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Transversely Isotropic ◽  
Bulk Acoustic Wave ◽  
Acoustic Wave Propagation ◽  
Wave Velocities ◽  
Saw Devices ◽  
Propagation Velocities

The objective of this paper is to study the bulk acoustic wave (BAW) propagation velocities in transversely isotropic piezoelectric materials, aluminum nitride, zinc oxide, cadmium sulfide and cadmium selenide. The bulk acoustic wave velocities are computed for each direction by solving the Christoffel’s equation based on the theory of acoustic waves in anisotropic solids exhibiting piezoelectricity. These values are calculated numerically and implemented on a computer by Bisection Method Iterations Technique (BMIT). The modification of the bulk acoustic wave velocities caused by the piezoelectric effect are graphically compared with the velocities in the corresponding non-piezoelectric materials. The results obtained in this study can be applied to signal processing, sound systems and wireless communication in addition to the improvement of surface acoustic wave (SAW) devices and military defense equipment.

scholarly journals Erratum to ‘Bulk Wave Velocities in Cortical Bone Reflect Porosity and Compression Strength’ [Ultrasound in Med. & Biol. 47 (2021) 799–808]

2021 ◽  
Vol 47 (6) ◽  
pp. 1637
Author(s):  
Laura Peralta ◽  
Juan Deyo Maeztu Redin ◽  
Fan Fan ◽  
Xiran Cai ◽  
Pascal Laugier ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Compression Strength ◽  
Bulk Wave ◽  
Wave Velocities

scholarly journals On degeneracy of dispersive waves at the bulk wave velocities

2019 ◽  
Vol 97 ◽  
pp. 03004
Author(s):  
Alla Ilyashenko ◽  
Sergey Kuznetsov
Keyword(s):  
Spectral Analysis ◽  
Wave Equation ◽  
Analytical Solutions ◽  
Bulk Wave ◽  
Displacement Fields ◽  
Linear Dispersion ◽  
Dispersive Waves ◽  
Wave Velocities ◽  
Phase Velocities ◽  
Secular Equations

Degeneracy of the linear dispersion wave equation at the phase velocities coinciding with the bulk wave velocities is observed and analysed. Spectral analysis of Pochhammer – Chree equation is performed. The corrected analytical solutions for components of the displacement fields are constructed, accounting degeneracy of the secular equations and the corresponding solutions.

Analysis of Sputtered Zinc Oxide Films

1980 ◽  
Vol 38 ◽  
pp. 416-417
Author(s):  
T. A. Emma ◽  
M. P. Singh
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Piezoelectric Materials ◽  
Oxide Films ◽  
Optical Quality ◽  
Zno Films ◽  
Rf Power ◽  
X Ray Diffraction ◽  
Sputtered Films ◽  
Zinc Oxide Films

Optical quality zinc oxide films have been characterized using reflection electron diffraction (RED), replication electron microscopy (REM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Significant microstructural differences were observed between rf sputtered films and planar magnetron rf sputtered films. Piezoelectric materials have been attractive for applications to integrated optics since they provide an active medium for signal processing. Among the desirable physical characteristics of sputtered ZnO films used for this and related applications are a highly preferred crystallographic texture and relatively smooth surfaces. It has been found that these characteristics are very sensitive to the type and condition of the substrate and to the several sputtering parameters: target, rf power, gas composition and substrate temperature.

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