Temperature Dependence of the Elastic, Piezoelectric, and Dielectric Constants of Lithium Tantalate and Lithium Niobate
Abstract
The elastic, piezoelectric, and dielectric constants, and their temperature dependence within the range 0°-110°C, have been determined for single crystals of lithium tantalate and lithium niobate. For each material, the constants were extracted from a combination of many ultrasonic phase-velocity measurements, the measured resonant and antiresonant frequencies of a single length-extensional bar resonator, and the measured low-frequency capacitances of two thin flat-plate specimens. For lithium tantalate, the normalized first temperature derivatives of the elastic constants range from -0.4 to -6.7×10-4/°C, while the derivatives for the piezoelectric stress constants range from -1.3 to +1.5×10-4/°C. In the case of lithium niobate, the elastic constant temperature derivatives are all on the order of -2×10-4/°C, while the piezoelectric temperature derivatives are all positive in the range 0.8-8.9×10-4/°C. The dielectric or permittivity temperature derivatives are positive for both materials.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- May 1971
- DOI:
- 10.1063/1.1660528
- Bibcode:
- 1971JAP....42.2219S