High Temperature And Pressure Resonant Ultrasound Spectroscopy Study Of Metal Hydride Systems

The goal of this dissertation is to characterize the elastic properties of palladium hydride near the tri-critical point as a classic example of metal hydride systems using the resonant ultrasound spectroscopy. A high temperature and high pressure resonant ultrasound spectroscopy system which include the RUS cell and the direct contact transducer set-up was designed and constructed. The temperature and pressure dependent of elastic moduli of palladium hydride and palladium crystals were obtained at five isotherms near the critical temperature, 293 °C and for pressure range of 250–500 psi. A strong softening of the shear modulus was observed at temperature and pressure points around the critical points, 293 °C and 290 psi respectively. On the other hand, anomalous softening of the bulk modulus and the C' was observed in the same temperature and pressure region. The investigations includes study of the equilibrium dynamics of hydrogen absorption/desorption in metal hydrides. A color map of the equilibrium dynamics pattern was developed and correlation between the color map and the palladium hydride phases was established.

Name thesis:degree_name

Ph.D. in Physics

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics and Astronomy

Year dc:date.available

2011

Author dc:creator

• Adebisi, Rasheed

Contributors dc:contributor

• Joseph R. Gladden
• Gregory S. Tschumper
• Joel Mobley

• Condensed Matter Physics

Repository record dc:identifier

https://egrove.olemiss.edu/etd/768

OAI identifier oai:identifier

oai:egrove.olemiss.edu:etd-1767