Influence of sample size on ultrasonic phase velocity measurements in piezoelectric ceramics
Abstract
Phase velocities of ultrasound are used for characterizing elastic properties of solids. One of the basic requirements is that the sample area should be much larger than the size of the transducer so that plane wave approximation will hold. This geometric requirement may not be possible to realize for some materials that can only be made in very small size. Using poled and unpoled lead zirconate titanate (PZT-5H) ceramics as examples, we have analyzed experimentally the sample size influence to the ultrasonic measurements. The smallest dimension that is in contact with the transducer is only 14% of the diameter of the transducer. We found that the phase velocity increases when the contact area becomes smaller. The velocity increase is 1.4% and 0.9%, respectively, in the unpoled and poled PZT-5H for the smallest dimension sample compared to bulk values.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- June 2002
- DOI:
- 10.1063/1.1479754
- Bibcode:
- 2002JAP....9110194Z
- Keywords:
-
- lead compounds;
- piezoceramics;
- ultrasonic velocity;
- elastic constants;
- size effect;
- echo;
- Acoustic Properties;
- Constants;
- Echoes;
- Elastic Properties;
- Lead Compounds;
- Phase Velocity;
- Piezoelectric Ceramics;
- Ultrasonics;
- Velocity;
- Velocity Measurement;
- 62.65.+k;
- 43.35.Cg;
- 77.84.Dy;
- 62.20.Dc;
- 77.65.Bn;
- Solid-State Physics;
- Acoustical properties of solids;
- Ultrasonic velocity dispersion scattering diffraction and attenuation in solids;
- elastic constants;
- Niobates titanates tantalates PZT ceramics etc.;
- Elasticity elastic constants;
- Piezoelectric and electrostrictive constants