Electro-elastic moduli and frequency dependence of KN single crystal

R Rouffaud (1) , F. Levassort (1) , M. Pham-Thi (2) , E. Leveugle (3) , Anne-Christine Hladky (4)

1 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)
2 Thales Research and Technology [Palaiseau]
3 TRT - Thales Research and Technologies [Orsay]
4 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520

— Functional properties of KNbO 3 single crystal are characterized. Large polydomain plates cutted from an as-grown KNbO 3 crystal (oriented along [001] c (45°-cut) direction) are used. At the fundamental resonance (10 MHz), thickness coupling factor is 65% and frequency dependence is measured with overtone resonances. Its variation is relatively high and reduces to around 45% at 160 MHz. Electro-elastic moduli are also determined by mixing measured parameters (from thickness and lateral modes) and constants already published as initial data. Final constants are obtained by a minimization process to tend toward a self-consistent electro-elastic moduli which is an important condition for numerical modelling. Single crystal, lead-free, functional characterization

Domaines: Matériaux

R Rouffaud, F. Levassort, M. Pham-Thi, E. Leveugle, Anne-Christine Hladky. Electro-elastic moduli and frequency dependence of KN single crystal. 2012 Joint 21st IEEE ISAF / 11th IEEE ECAPD / IEEE PFM (ISAF/ECAPD/PFM), Jul 2012, Aveiro, Portugal. pp.1-4, ⟨10.1109/ISAF.2012.6297785⟩. ⟨hal-01705153⟩