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Ferroelectrics For this class of materials, typified by BaTiO3 , attention is focussed on the process of ageing, i.e. the gradual change of materials properties with time, isothermal conditions and absence of external mechanical loads implied. This process manifests itself in alterations of static and, respectively, kinetic characteristics such as the clamping pressure exerted on the walls of ferroelectric domains and the asymmetry of the electrical conductivity regarding current flow parallel or antiparallel to the direction of the spontaneous polarization; phenomena, which may be explained in terms of migration of charged point defects under the influence of internal or external electric fields. Preliminary results obtained with a drift-diffusion approach suggest that the experimentally observed drastic rise of the clamping pressure with time is indeed controlled by a mechanism of this kind. The theories underlying these investigations range from microscopic to macroscopic; their realizations employ analytical as well as computational techniques. Staff Members Head H.E. The Hon. Prof. Dr. Dr.habil. Hermann Rauh, M.A., C.Phys., F.Inst.P., F.I.M., O.I.A. Research Associates Dr. Yuri A. Genenko, D.Sc. Dr. Sergey V. Yampolskii Postgraduate Dipl.-Phys. Frederik Neumann Secretary N.N. Visiting Scientists Dr. Alexei V. Golovchan Prof. Dr. Igor L. Lyubchanskii Dr. Galina I. Yampolskaya Research Projects Electrodynamics of Macroscopic Magnet/Superconductor Heterosystems (German Research Foundation (DFG), 2003-2006) Kinetic Modelling of the Charge Transfer in Organic Semiconductors and Ionic Conductors (Collaborative Research Centre (SFB) ”Electric Fatigue in Functional Materials”, 2003- 2006, with Prof. Dr. H. v. Seggern, Darmstadt University of Technology) Publications Genenko, Y.A.; Rauh, H.; Novel superconductor/magnet resonant configurations: Exact analytic representations of the Meissner state and the critical state, J. Phys.: Conf. Ser. 43 (2006) 568. - 50 -
Lupascu, D.C.; Genenko, Y.A.; Balke, N.; Aging in ferroelectrics, J. Amer. Ceramic Soc. 89 (2006) 224. Neumann, F.; Genenko, Y.A.; v. Seggern, H.; The Einstein relation in systems with trapcontrolled transport, J. Appl. Phys. 99 (2006) 013704. Neumann, F.; Genenko, Y.A.; Melzer, C.; v. Seggern, H.; Self-consistent theory of unipolar charge-carrier injection in metal/insulator/metal systems, J. Appl. Phys. 100 (2006) 084511. Nikolaenko, Y.M.; Medvedev, Y.V.; Genenko, Y.A.; Ghafari, M.; Hahn, H.; Interface thermal resistance of a nanostructured FeCoCu film and a Si substrate, phys. stat. sol. (c) 3 (2006) 1343. Yampolskii, S.V.; Genenko, Y.A.; Rauh, H.; Snezhko, A.V.; The Bean model of the critical state in a magnetically shielded superconductor filament, J. Phys.: Conf. Ser. 43 (2006) 576. Yampolskii, S.V.; Yampolskaya, G.I.; Rauh, H.; Magnetic dipole-vortex interaction in a bilayered superconductor/soft-magnet heterostructure, Europhys. Lett. 74 (2006) 334. - 51 -
Page 1: ANNUAL REPORT 2 0 0 6 FACULTY OF MA
Page 4 and 5: Annual Report 2006 Faculty 11 Mater
Page 6 and 7: Preface The year 2006 of the Depart
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Page 24 and 25: Publications Fleissner, A.; Schmid,
Page 26 and 27: • Surface analysis The UHV-surfac
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constituents. The requirement of va
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In order to assess the influence of
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In this study, we have therefore de
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Fig. 1: Proposed models for a) Pt,
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Synthesis of oxide-polymer nanocomp
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Diploma Theses Böhme, Mario; Herst
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Sperling, Sebastian; Untersuchungen
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Institute of Applied Geosiences Phy
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Research Projects Geomorphology and
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Engineering Geology Engineering Geo
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Investigation of a Doline in NE-Hes
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Applied Sedimentology Sedimentary r
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econstruction.(Diploma thesis in co
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Darmstadt University of Technology
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Geomaterials Science Geomaterial Sc
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Gregori, G.; Kleebe H.-J.; Sorarù,
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Hessische Industriemüll GmbH). Due
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Technical Personnel Josef Kolb, Dip
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Research Projects Environmental sca
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Fig. 1: Aerial photo of the Lake Li
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Lithological Map of the Japanese Ar
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tower stripping, and therefore much
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Diffusion and reaction in micro- an
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Rift dynamics, uplift and climate c
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Geology, land use change and erosio
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nearly half a century has been perf
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The Effect of LiF Addition on the S
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In case of the undoped sintered B6O
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Microstructures in Omphacite and Ot
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Modelling phase-assemblage diagrams
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As an example, Fig. 2 shows the che
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MATERIALS SCIENCE Physical Metallur
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