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2018-07-09 - Colloque/Présentation - poster - Anglais - 1 page(s)

Dupla Florian , Renoirt Marie-Sophie , Gonon Maurice , Smagin Nikolay, Duquennoy Marc, Martic Grégory, "Influence of Ba Substitution and Surface Roughness on the Oriented Crystallization of Sr-Fresnoite Glass-Ceramics" in Electroceramics XVI, Hasselt, Belgique, 2018

  • 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)
Texte intégral :

Abstract(s) :

(Anglais) Strontium fresnoite glass-ceramic Sr2TiSi2O8 is a piezoelectric material with no Curie temperature. Its macroscopic polarization comes from a crystallographic orientation induced by the surface crystallization of a glass. Thanks to its thermal stability, strontium fresnoite is a good candidate for high temperature humidity and pressure sensors using Surface Acoustic Waves (SAW) technology. As the SAW require a minimal depth to propagate freely along the sensor surface, the orientation has to be controlled for a few hundred micrometers. Volume crystallization should be avoided as much as possible, because it is not piezoelectric and acts as a barrier for the surface waves. To control that, strontium and barium-containing samples Sr2-xBaxTiSi2O8 are synthesized during an isothermal process while being embedded into powder. The orientation is observed over depth thanks to XRD experiments for different compositions and surface roughnesses. The main orientations are along the (002) and (201) planes. The crystallization speed is also measured, as it is an important parameter. If the crystallization speed increases, volume crystallization does not have time to appear.