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TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology

Wednesday, 28 January 2009
(at 15:00 in room lecture hall Berndt-Bau, Helmholtzstr. 7)
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Mechanical Properties Of Ferroelectric Ceramics - From Domains To Actuators

Gerold Schneider

Institute for Advanced Ceramics
University of Technology Hamburg-Harburg

During the last 20 years ferroelectric ceramic stack actuators have been developed successfully and they are produced nowadays as a mass product in quantities of up to 100 millions per year. Currently enormous efforts are undertaken to replace lead based actuators by lead free materials systems. As these devices use the piezoelectric effect by converting electrical in mechanical energy a detailed understanding of the mechanical properties of ferroelectric ceramics is of prime importance for the production reliable components. Furthermore it is a fascinating field of materials science. This talk reviews the mechanical properties of ferroelectric ceramics at different lengths scales. Experimental results of investigations from nanoindentation over macroscopic ferroelastic up to electrode/ceramic interface crack measurements are presented and discussed in terms of their underlying fundamental processes, as dislocation motions, domain wall motions or surface charges in cracks. The contributions of Wolfgang Kreher are presented and issues for further research are address.

Brief Bio:

Gerold A. Schneider, Full Professor, Hamburg University of Technology (TUHH) is the Head of the Institute of Advanced Ceramics. Dr. Schneider joined the faculty of the TUHH in 1994. He is the coordinator of the TUHH - Research Initiative "Product Oriented Materials Development". He has extensive experience in mechanical and fracture mechanical properties of structural as well as electro-ceramic materials where he has organized several workshops and symposia. As a researcher, he has published more than 80 articles and chapters dealing with the areas of thermal shock of ceramics, fracture of ferroelectric ceramics as well as AFM and nanoindention investigations of brittle materials and teeth. He also holds two German patents and developed a commercially available mechanical testing device together with the company Exact (Hamburg). Dr. Schneider spent a sabbatical as Adjunct Professor at the University of California, Santa Barbara in 1999 and as a Visiting Professor at the University of Sydney in 2008. He was awarded with the Heinz-Maier-Leibnitz-prize of the German Research Foundation and the German Federal Minister of Education and Science in 1992 and is an academician of the World Academy of Ceramics. Most recently he was awarded with the Sir Thomas Kay Sidey Visiting Professorship for 2009 of the University of Otago, New Zealand. Dr. Schneider is a member of the Deutsche Gesellschaft für Materialkunde, Deutsche Physikalische Gesellschaft, American Ceramic Society and Verein Deutscher Ingenieure.

Invited by G. Cuniberti (nanoSeminar)

last modified: 2021.10.21 Thu
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