Stability of langasite regarding SAW applications above 800°C in air atmosphere - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2012

Stability of langasite regarding SAW applications above 800°C in air atmosphere

Omar Elmazria

Résumé

Y-cut langasite (LGS) crystals are annealed under air atmosphere at temperatures from 800°C to 1200°C, and for time periods between one week and one month. Surface modifications are tracked with energy-dispersive X-ray spectroscopy, secondary ion mass spectroscopy, scanning electron microscopy and atomic force microscopy. This study shows that LGS is suitable for surface acoustic wave (SAW) one-week applications in air atmosphere at temperatures up to 1100°C. Above this temperature, many rough Ga-depleted flaws appear on crystal surface. If application is extended to one month, the maximum operating temperature decreases to temperatures below 1000°C. Indeed one-month annealing at 1000°C causes the apparition of many defects at the surface of LGS crystal. This deterioration impacts the performance of SAW delay lines, increasing insertion losses of 4-5 dB. Moreover, a shift of the operating frequency is also observed, enlarging with the harmonic rank.
Fichier principal
Vignette du fichier
Proc_Dresden_2012.pdf (7.4 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00923021 , version 1 (20-02-2023)

Identifiants

Citer

Thierry Aubert, Omar Elmazria. Stability of langasite regarding SAW applications above 800°C in air atmosphere. IEEE International Ultrasonics Symposium, Oct 2012, Dresde, Germany. pp.2098-2101, ⟨10.1109/ULTSYM.2012.0524⟩. ⟨hal-00923021⟩
69 Consultations
2 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More