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Das, J.; Kim, K. B.; Xu, W.; Wei, B. C.; Zhang, Z. F.; Wang, W. H.; Yi, S.; Eckert, J.; Ductile Metallic Glasses in Supercooled Martensitic Alloys, Mater. Trans. 47 (2006) 2606. Concustell, A.; Mattern, N.; Wendrock, H.; Kühn, U.; Gebert, A.; Eckert, J.; Greer, A. L.; Sort, J.; Baró, M. D.; Mechanical Properties of a Two-Phase Amorphous Ni-Nb-Y Alloy Studied by Nanoindentation, Scripta Mater. 56 (2006) 85. Kühn, U.; Eymann, K.; Mattern, N.; Eckert, J.; Gebert, A.; Bartusch, B.; Schultz, L.; Limited Quasicrystal Formation in Zr-Ti-Cu-Ni-Al Bulk Metallic Glasses, Acta Mater. 54 (2006) 4685. Dasgupta, S.; Das, J.; Eckert, J.; Manna, I.; Influence of Environment and Grain Size on Magnetic Properties of Nanocrystalline Mn-Zn Ferrite, J. Magn. Magn. Mater. 306 (2006) 9. Dasgupta, S.; Kim, K. B.; Ellrich, J.; Manna, I.; Eckert, J.; Mechano-Chemical Synthesis and Characterization of Microstructure and Magnetic Properties of Nanocrystalline Mn1xZnxFe2O4, J. Alloys & Compounds 424 (2006) 13. Van Steenberge, N.; Das, J.; Concustell, A.; Sort, J.; Suriñach, S.; Eckert, J.; Baró, M. D.; Influence of Annealing on the Microstructure and Hardness of Ti67.9Fe28.36Sn3.85 Nanocomposite Rods, Scripta Mater. 55 (2006) 1087. Zhang, Z. F.; Wu, F. F.; Gao, W.; Tan, J.; Wang, Z. G.; Stoica, M.; Das, J.; Eckert, J.; Shen, B. L.; Inoue, A.; Wavy Cleavage Fracture of Bulk Metallic Glass, Appl. Phys. Lett. 89 (2006) 251917. Das, J.; Eckert, J.; Theissmann, R.; Structural Short-Range Order of the β-Ti Phase in Bulk Ti-Fe-(Sn) Nanoeutectic Alloys, Appl. Phys. Lett. 89 (2006) 261917. Eckert, J.; Structure Formation and Mechanical Behavior of Two-Phase Nanostructured Materials, in: Nanostructured Materials – Processing, Properties and Potential Applications, (Hrsg. C.C. Koch). 2 nd Edition: William Andrew Publishing, Norwich, NY, USA (2006) 565. Eckert, J.; Das, J.; Kim, K. B.; Nanostructured Composites: Ti-Base Alloys, in: The Dekker Encyclopedia of Nanoscience and Nanotechnology, (Hrsg. J.A. Schwarz, C. Contescu, K. Putyera). Marcel Dekker, Inc., New York, NY, USA (2006) DOI: 10.1081 / E-ENN- 120042102. Eckert, J.; Scudino, S.; Yu, P.; Duhamel, C.; Powder Metallurgy of Nanostructured High Strength Materials, in: Progress in Powder Metallurgy, (Hrsg. D.Y Yoon, S.-J.L. Kang, K.Y. Eun, Y.-S. Kim). Mater. Sci. Forum 534-536 (2006) 1405. - 14 -
Ceramics Group The emphasis in the ceramics group is on the correlation between microstructure and mechanical as well as functional properties. A number of processing methods are available in order to accomplish different microstructure classes, to determine their specific properties in an experiment and to rationalize these with straightforward modelling efforts. Thereby a materials optimization is afforded, which allows effective interplay between processing, testing and modelling. The scientific effort can be grouped as follows: 1. Sintering of oxides Sintering of ceramics is approached using a continuum mechanical description, which affords inclusion of laminate stresses as arise in sintering of thin films and cosintering of several layers. In order to determine the constitutive equations for the sintering bodies, dilatometry and a new hot forging apparatus are used. This equipment together with a substantial modelling effort allows measurement of sintering stresses and viscosities and thereby predictions of shrinkage and curvature in multilayer structures. From an application points of view, thin optical layers and printed electronics are also investigated. Materials under consideration are ZrO2, Al2O3, TiO2, ZnO as well as LTCC materials. 2. Mechanical properties of ceramics and composites: Work on mechanical properties is geared towards an improved understanding of fracture strength, fracture toughness, R-curve behaviour and subcritical crack growth. Together with several European research groups we prepare and characterize metalceramic composites and metal-ceramic functionally graded materials Materials under consideration are ZrO2, Al2O3/Cu and Al2O3/Al as well as various piezoceramics. 3. Ferroelectric materials: Two scientific questions are of interest for this group. Reliability of piezoceramics for applications as actuator materials is under investigation. An increasing number of electrical cycles leads to a progressive loss of obtainable strain and polarisation in these materials. Therefore electrical fatigue as influenced by the type of electrical loading, uniaxial stress, frequency and temperature are investigated. Recently, we developed a new method for stress-assisted (electromechanical poling), which reduces the required poling field considerably. Different new piezoceramics are being developed, especially new lead-free compositions, but also high-temperature piezoceramics. Materials under consideration are PZT, lead-free piezoceramics and high-temperature piezoceramics. - 15 -
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
Page 8 and 9: difference of numerical and analyti
Page 10 and 11: Institute of Materials Science Phys
Page 12 and 13: Research Projects Bulk Amorphous Al
Page 14 and 15: el Dsoki, C.; Landersheim, V. ; Kau
Page 18 and 19: Staff Members Head Prof. Dr. Jürge
Page 20 and 21: Zhou L.; Rixecker G.; Aldinger F.;
Page 22 and 23: concerned with the synthesis and ch
Page 24 and 25: Publications Fleissner, A.; Schmid,
Page 26 and 27: • Surface analysis The UHV-surfac
Page 28 and 29: T. Mayer, U. Weiler, E. Mankel and
Page 30 and 31: Thin films The Thin Film division w
Page 32 and 33: Berky, W.; Gottschalk, S.; Elliman,
Page 34 and 35: Guest Scientists Research Projects
Page 36 and 37: Hesse, S.; Zimmermann, J.; von Segg
Page 38 and 39: Structure Research The research in
Page 40 and 41: Research Projects Functional Advanc
Page 42 and 43: Dincer, I.; Elerman, Y.; Elmali, A;
Page 44 and 45: hexakis(imidazole)nickel(II)bis(for
Page 46 and 47: Chemical Analytics The chemical ana
Page 48 and 49: Collaborations The above mentioned
Page 50 and 51: Hoffmann, P.; Non-Invasive Identifi
Page 52 and 53: Ferroelectrics For this class of ma
Page 54 and 55: Materials Modelling The research ac
Page 56 and 57: Materials for Renewable Energies In
Page 58 and 59: Joint Research Laboratory Nanomater
Page 60 and 61: Collaborative Research Center (SFB)
Page 62 and 63: B7 P.I.: Prof. H. v. Seggern / Dr.
Page 64 and 65: The glass transition temperature (T
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transition allows to investigate at
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Relative density 1.00 0.95 0.90 0.8
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Fig. 2 shows the time dependencies
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Dielectric interface trap engineeri
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∆V C q th eff 12 −2 p ( VGS = 0
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Fig. 3: Schematic of the photovolta
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synthesis and analysis of interface
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Fig. 2: Resistivity vs temperature
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Fig. 2: X-ray appearance near-edge
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Capacity [mAhg -1 ] 700 600 500 400
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Texture investigations and field em
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screening effects. Gold coating of
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Figure 2 shows a selected region of
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The spectrum shows that apart from
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The effect of crystallinity on the
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Electrochemical investigation and c
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This phenomenon can be understood c
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∆ = 0 − exhibiting dominance of
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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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