2016 CAP Congress / Congrès de l'ACP 2016

Phonon Dynamics of Lead Scandium Tantalate

14 Jun 2016, 19:06

2m

SITE Atrium (University of Ottawa)

Poster (Student, In Competition) / Affiche (Étudiant(e), inscrit à la compétition) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) DCMMP Poster Session with beer / Session d'affiches, avec bière DPMCM

Speaker

Mr Stephen Spencer (Memorial University of Newfoundland)

Description

Brillouin light scattering experiments were performed on lead scandium tantalate ceramics using a 180˚ backscattering geometry. Spectral peaks due to longitudinal bulk acoustic modes were observed and their frequencies were used to determine the corresponding phonon velocities and elastic constant c¬11. Temperature dependence of longitudinal bulk mode frequencies, and subsequently velocities, was characterized in the high temperature regime. Experiments performed on a sample of lead scandium tantalate ceramic coated with a thin film of aluminium failed to yield Brillouin peaks due to surface acoustic modes. Complementary Raman scattering experiments were performed on lead scandium tantalate at room temperature and high temperatures.