Thursday, Apr. 20th, 2017, 14:00 – 16:00 h
Information from Conductivity Spectra on Charge Carrier Dynamics in Diverse Materials
Ionic or electronic conductivity can be measured in a variety of materials, be it, crystalline, glassy, ionic liquids or ionic melts using impedance spectroscopy which covers from a few milli-Hz to a few MHz in the frequency scale. Not only is this technique widely applicable to many different kinds of materials, it also allows for the experimental measurements to be presented in various representations. Each of these representations contain information which are better resolved in different frequency ranges. Further, scaling features of conductivity and permittivity spectra give better insights into factors that influence the conductivity. Here both model-free and model-based approaches are useful.
During the first half of the workshop the young researchers and the students will be taken on a pictorial tour through the experimental methods of impedance spectroscopy and the different representations of the spectra in a wide-class of materials. During the second half, it will be shown how to analyse these spectra and insights into the charge carrier dynamics will be presented. They will be familiarised with some model-free and model-based approaches employed in the analysis.
Dr. Ms. Radha D. Banhatti is working at Ruđer Bošković Institute, Division of Materials Chemistry since November 2015 with the grant of NEWFELPRO fellowship for experienced researchers. She obtained her Ph.D. in Physics in 1994 from Indian Institute of Technology, Madras, India. She was an Alexander-von-Humboldt fellow in the Department of Physical Chemistry, University of Muenster, Germany between 1995 and 1998, and subsequently worked there from 2000-2010 in an international collaboration project. Her area of work is solid state ionics and she specialises in numerical modelling of conductivity spectra.