Colloquium: Dr. BieringerDepartment of Chemistry University of Manitoba Winnipeg, Manitoba
In-Situ Preparation and Evaluation of Ion Conductors: A Chemist's Perspective on Materials Discovery
Solid state oxides represent diverse materials with tunable electronic, magnetic, optical and mechanical properties. Unfortunately the successful synthesis of functional materials often requires significant experience and expertise. In contrast to the systematic design and synthesis of molecular systems the preparation of extended structures is not easily predicted. Usually solid state materials are prepared and processed at very high temperatures generating equilibrium or near equilibrium structures. Our research has illustrated that many metastable phases with large existence ranges can be prepared and often provide the desired properties not accessible for thermodynamic products. We are developing low temperature synthetic strategies for the preparation of novel oxide ion conducting phases. Ion defect concentrations and defect structures can be controlled and thus materials properties can be tuned. Our research program focusses on model compounds that allow controlling defects and prepare these materials using non-conventional synthetic routes. In-situ methods play a fundamental role in our materials discovery program. This work is rooted in our solid state structure – reactivity research program and can be expanded to a plethora of functional materials. Additional examples beyond the ion conduction projects will be given in this presentation.