DI-UMONS : Dépôt institutionnel de l’université de Mons

Recherche transversale
Rechercher
(titres de publication, de périodique et noms de colloque inclus)
2019-06-19 - Colloque/Présentation - communication orale - Anglais - 15 page(s)

Renoirt Marie-Sophie , Dupla Florian , Gonon Maurice , "Influence of crystallization process parameters on crystals growth mechanisms, microstructure and piezoelectric properties of glass-ceramics containing fresnoite crystals" in XVI Conference and Exhibition of the European Ceramic Society (ECERS), Torino, Italie, 2019

  • Codes CREF : Sciences de l'ingénieur (DI2000)
  • Unités de recherche UMONS : Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) This work is part of a project that aims at developing high-temperature pressure Surface Acoustic Waves sensors. For this purpose, piezoelectric glass-ceramics containing fresnoite crystals have been developed and successfully tested up to 800°C. However, parent glass crystallization needs to be further studied in order to control the glass-ceramic microstructure and properties. The glass-ceramic contains a crystalline pyroelectric and non-ferroelectric phase. Macroscopic piezoelectric properties are obtained if the crystallization leads to a preferential orientation of the c crystal’s polar axis (c-axis). The parent-glass composition is 2SrO-TiO2-3.3SiO2-0.1Al2O3-0.2K2O and the crystallization of this specific glass composition leads to a glass-ceramic composed of 70 vol% of Sr2TiSi2O8 crystals and 30 vol% of residual glass. Crystallization is performed by heating the parent glass plate up to a temperature ranging between 850°C and 950°C. For all temperatures, a surface nucleation mechanism leads to a crystallization front propagating from the surface into the bulk over time. Velocity of the front increases with temperature. XRD analyses show that a strong (002) planes preferential orientation is observed for low depth. After 100μm, a tilt to (201) planes is sometimes observed. However, its origin is not yet understood, and it was impossible, during this research, to relate this tilt to the different processing conditions.