Electronic Material Properties - und Geowissenschaften ...

Recommendations

Info

B7 P.I.: Prof. H. v. Seggern / Dr. A. Klein Topic: Dynamics of electrical properties in fatigued PZT Division C: Modelling C1 P.I.: Prof. K. Albe Topic: Quantum mechanical computer simulations for electron and defect structure of oxides C2 P.I.: Prof. K. Albe Topic: Atomistic computer simulations of defects and their mobility in metal oxides C3 P.I.: Prof. R. Müller / Prof. W. Becker Topic: Microscopic investigations into defect agglomeration and its effect on the mobility of domain walls C5 P.I.: Dr. Y. Genenko / Prof. H. v. Seggern Topic: Phenomenological modelling of bipolar carrier transport in organic semiconducting devices under special consideration of injection, transport and recombination phenomena Division D: Component properties D1 P.I.: Professor J. Rödel / Dr. T. Granzow Topic: Mesoscopic and macroscopic fatigue in doped ferroelectric ceramics D3 P.I.: Dr. A. Klein Topic: Function and fatigue of conducting electrodes in organic LEDs and piezoceramic actuators D4 P.I.: Dr. Ch. Melzer / Professor H. v. Seggern Topic: Fatigue of organic semiconductor components D5 P.I.: Professor W. Jaegermann Topic: Processing and characterization of Li-ion thin film batteries - 60 -
Reports of Research Activities High strength metastable materials with enhanced ductility J. Das, S. Pauly, F. Ettingshausen, K. B. Kim, J. Eckert The recent developments in the area of metastable metallic materials like bulk metallic glasses and nanostructured alloys have revealed the large potential of Cu-, Ti- and Zrbased glassy and nanostructured (nano-eutectic) composites for a variety of applications as high specific strength structural materials. Previous investigations on the room temperature deformation behavior have shown that the respective volume fractions of dendrites and nano-/ultrafine eutectic matrix govern the overall strength and ductility of the material. The development of new alloys derived from glass-forming alloy compositions with homogeneous nano-/ultrafine eutectic microstructure and bulk metallic glasses with high strength and enhanced room temperature plastic deformability was the major aim of the work in 2005. Ultimately, this should open up the possibility to develop tailor-made microstructures in order to improve the mechanical properties of such novel materials. As an example for ductile bulk metallic glasses, Cu50Zr50 and Cu47.5Zr47.5Al5 2 mm diameter (∅) rods were investigated in detail using x-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Even though the structure of Cu50Zr50 was found to be amorphous through XRD and DSC studies, traces of very tiny crystallites were found to be randomly present in the glassy matrix. The size of these crystallites is about 2 – 5 nm as measured from the lattice fringes observed in high resolution images. Cu47.5Zr47.5Al5 gives no hint for the presence of any distinguishable crystallites like Cu50Zr50. However, the selected area diffraction pattern from the overall structure shows a weak contrast overlapping on the amorphous ring (Fig. 1, inset). The high resolution image of this alloy reveals no lattice fringes of crystals. Maximum 3 – 4 atomic layers are observed to have a regular arrangement without any long-range order. Fig. 1: High resolution TEM image of a Cu47.5Zr47.5Al5 glass. Inset: selected area diffraction pattern from such a microstructure. Cu50Zr5 Cu47.5Zr47.5Al5 Cu47.5Zr47.5Al5 Fig. 2: Compressive stress-strain curves of Cu50Zr50 and Cu47.5Zr47.5Al5 glassy rods. Inset: true stress-true strain curve of Cu47.5Zr47.5Al5 showing “work-hardening”-like behavior. - 61 -
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 16 and 17: Das, J.; Kim, K. B.; Xu, W.; Wei, B
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 64 and 65: The glass transition temperature (T
Page 66 and 67: transition allows to investigate at
Page 68 and 69: Relative density 1.00 0.95 0.90 0.8
Page 70 and 71: Fig. 2 shows the time dependencies
Page 72 and 73: Dielectric interface trap engineeri
Page 74 and 75: ∆V C q th eff 12 −2 p ( VGS = 0
Page 76 and 77: Fig. 3: Schematic of the photovolta
Page 78 and 79: synthesis and analysis of interface
Page 80 and 81: Fig. 2: Resistivity vs temperature
Page 82 and 83: Fig. 2: X-ray appearance near-edge
Page 84 and 85: Capacity [mAhg -1 ] 700 600 500 400
Page 86 and 87: Texture investigations and field em
Page 88 and 89: screening effects. Gold coating of
Page 90 and 91: Figure 2 shows a selected region of
Page 92 and 93: The spectrum shows that apart from
Page 94 and 95: The effect of crystallinity on the
Page 96 and 97: Electrochemical investigation and c
Page 98 and 99: This phenomenon can be understood c
Page 100 and 101: ∆ = 0 − exhibiting dominance of
Page 102 and 103: constituents. The requirement of va
Page 104 and 105: In order to assess the influence of
Page 106 and 107: In this study, we have therefore de
Page 108 and 109: Fig. 1: Proposed models for a) Pt,
Page 110 and 111: Synthesis of oxide-polymer nanocomp
Page 112 and 113:
Diploma Theses Böhme, Mario; Herst
Page 114 and 115:
Sperling, Sebastian; Untersuchungen
Page 116 and 117:
Institute of Applied Geosiences Phy
Page 118 and 119:
Research Projects Geomorphology and
Page 120 and 121:
Engineering Geology Engineering Geo
Page 122 and 123:
Investigation of a Doline in NE-Hes
Page 124 and 125:
Applied Sedimentology Sedimentary r
Page 126 and 127:
econstruction.(Diploma thesis in co
Page 128 and 129:
Darmstadt University of Technology
Page 130 and 131:
Geomaterials Science Geomaterial Sc
Page 132 and 133:
Gregori, G.; Kleebe H.-J.; Sorarù,
Page 134 and 135:
Hessische Industriemüll GmbH). Due
Page 136 and 137:
Technical Personnel Josef Kolb, Dip
Page 138 and 139:
Research Projects Environmental sca
Page 140 and 141:
Fig. 1: Aerial photo of the Lake Li
Page 142 and 143:
Lithological Map of the Japanese Ar
Page 144 and 145:
tower stripping, and therefore much
Page 146 and 147:
Diffusion and reaction in micro- an
Page 148 and 149:
Rift dynamics, uplift and climate c
Page 150 and 151:
Geology, land use change and erosio
Page 152 and 153:
nearly half a century has been perf
Page 154 and 155:
The Effect of LiF Addition on the S
Page 156 and 157:
In case of the undoped sintered B6O
Page 158 and 159:
Microstructures in Omphacite and Ot
Page 160 and 161:
Modelling phase-assemblage diagrams
Page 162 and 163:
As an example, Fig. 2 shows the che
Page 164:
MATERIALS SCIENCE Physical Metallur
show all

Electronic Material Properties - und Geowissenschaften ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?