Non-contacting determination of the piezoelectric coefficient d 33 of lithium tantalate from room temperature up to 400 °C
Year: 2026
Type: article
Abstract: In this study, a non-contact, optical methodology based on laser-Doppler vibrometry (LDV) is presented to directly determine the piezoelectric constant d 33 of LiTaO 3 in a temperature range from room temperature to 400 °C as a proof of concept for high-temperature piezoelectric characterization. LiTaO 3 is chosen as a model material as it is a representative piezoelectric material with applications in sensors and surface acoustic wave devices; however, reliable high-temperature data for d 33 are only available to a limited extent, and even room temperature data, often derived from indirect or contact-based methods, show large variations. The presented approach employs freely vibrating LiTaO 3 disks mounted in a minimal-contact holder, enabling off-resonant and resonant LDV measurements with temperature control in a furnace. The measured displacements, together with the applied excitation and the measured resonance behavior, yield d 33 values in the off-resonant regime that range between approximately 12 and 15 pm V −1 at 21 up to 400 °C, with indications of a slight temperature dependence that remains within experimental uncertainty. The LDV technique demonstrated here provides (i) non-contact measurement virtually free of clamping effects, (ii) access to high-temperature operation limited only by the furnace, (iii) the ability to map surface distribution, and (iv) the detection of resonances, thereby enabling off-resonant frequency ranges to be determined and to compare with literature values obtained by indirect or contact methods. While this study focuses on LiTaO 3 , the method is applicable to systems that exhibit displacements down to a few picometers.
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $679
Award: G4583573540
OpenAlex ID: W7165965890