|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||High-Temperature Systems for Energy Conversion and Storage
||High Temperature Resonant Ultrasound Spectroscopy Methodologies Applied to Relaxor Ferroelectrics
||Joseph R. Gladden, Sumudu Tennakoon
|On-Site Speaker (Planned)
Elastic constants measurements, along with temperature and pressure derivatives, are of interest to both the physics and engineering communities. Elastic constants provide a sensitive probe into the atomic environment and represent macroscopic elastic stiffness. One of the most precise and efficient methods for such measurements is resonant ultrasound spectroscopy (RUS) in which the vibrational resonance spectrum of a sample is used to determine the full elastic tensor of the material. We will discuss several methodologies our lab has developed to make RUS measurements at temperatures up to 1300K and pressures up to 140 atm. We have recently used these tools to study the rather complex phase diagram of the relaxor ferroelectric lead magnesium niobate - lead titanate (PMN-PT). We have observed very strong stiffening as the material is heated and driven from the morphotropic phase boundary region into the cubic phase as well as strong pressure sensitivity near this transition.
||Planned: A print-only volume