Name: Layla Badr
Diploma / M.Sc degree: American University of Beirut, Lebanon
(February 2007)

PhD Project: Conductivity measurements of the Nearly-Constant-Loss-Effect (NCL) in Glassy Systems

Abstract of Research Project

The motion of mobile ions in materials with disordered structures such as glasses is a complicated many-particle process. Information on the essential features of the vibrational, relaxational and translational ion dynamics is obtained by measuring the frequency-dependent ionic conductivity.

The main goal of my Ph.D. project is to improve the understanding of the electrical conduction in glassy materials. To investigate the dynamic properties of interacting ions/charges in glasses, conductivity spectroscopy will be employed. The research will focus on the Nearly Constant Loss (NCL) phenomenon in wide ranges of temperature and frequency. The glass system employed for my study is the silver iodide - silver metaphosphate (AgI•AgPO₃) glass. This glassy system is particularly interesting because its conductivity spectrum has an NCL-type component. Furthermore, the elementary rates for the MIGRATION-type (caused by translational hops) and NCL-type (caused by localized displacements) movements of the ions are found to differ markedly from each other for this glassy system, not only with regard to their absolute value but also in their temperature dependence.



Publications

R. D. Banhatti, D. Laughman, L. Badr, K. Funke
Nearly constant loss effect in sodium borate and silver meta-phosphate glasses: New insights
Solid State Ionics 192 (2011), 70.

K. Funke, R. D. Banhatti, D. M. Laughman, L. G. Badr, M. Mutke, A. Santiæ, W. Wrobel, E. Fellberg, C. Biermann
First and Second Universalities: Expeditions Towards and Beyond
Z. Phys. Chem. 224 (2010), 1891.



Layla Badr
eMail: Layla Badr