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Chemical Analytics The chemical analytics division deals with all kinds of topics concerned with qualitative, semiquantitative and quantitative analytics of elemental composition and characterisation of chemical binding in solid and liquid samples. For solids, measurements with high spatial resolution are carried out by Electron Probe Micro Analysis (EPMA) and Secondary Ion Mass Spectrometry (SIMS). The latter is also used for thin film analysis with high depth resolution. Average compositions of solids are analyzed by X-ray Fluorescence Analysis (XRF), solutions of materials are measured by Atomic Absorption Spectrometry (AAS), ICP Optical Emission Spectrometry (ICP-OES) and Gas Chromatography, coupled with high resolution Mass Spectrometry (GC-MS). Present research topics are: Thin film speciation In thin film technology, the identification of chemical compounds, phases and binding conditions is of basic importance. In a collaboration with Physikalisch-Technische Bundesanstalt in Berlin and institutes in Novosibirsk/Russia, thin films of boron carbonitride and silicon carbonitride are prepared and characterized. The preparation techniques are plasma enhanced chemical vapour deposition and sputtering (physical vapour deposition). The chemical composition of the films is measured by SIMS. The atomic binding states are investigated by Near Edge X-ray Absorption Fine Structure (NEXAFS) measurements, partially in Total reflection and Glancing Incidence X-ray Fluorescence (TXRF, GIXRF) geometry, by X-ray Photoelectron Spectrometry (XPS – collaboration with Dr. A. Klein, Surface Science), and by Transmission Electron Microscopy with Electron Energy Loss Spectrometry (TEM-EELS). The TXRF-NEXAFS experiments are carried out at BESSY II. In another project, thin films (nanofilms) of carbides of boron, silicon, titanium, and tantalum are formed by hydrocarbon plasma immersion ion implantation, in collaboration with Industrial Technology Center of Nagasaki. The chemical film composition is analyzed by SIMS, the phase composition by X-ray diffraction. Film morphology and microstructure are investigated by scanning electron microscopy and by atomic force microscopy. - 44 -
Corrosion Phenomena of aqueous corrosion of metals, depending on their chemical composition, phase and structure, are investigated by electrochemical and trace analytical methods. The methods include potential-time and current-potential (polarization, cyclic voltammetry) measurements, Electrochemical Noise Analysis (ENA) and Electrochemical Impedance Spectroscopy (EIS). Immersion tests with chemical analysis of the dissolved material are carried out by e.g. Atomic Absorption Spectrometry and ICP Optical Emission Spectrometry. The materials investigated are the metals aluminium, magnesium, and iron, and alloys. A special topic is the corrosion of thin films, formed by plasma and ion beam methods, such as diamond-like amorphous carbon, or by sol-gel synthesis in combination with spin coating, such as zirconium oxide. These films (on the nanometer scale, i.e. nanofilms) suffer from microporosity which greatly influences the film/substrate corrosion performance. The underlying corrosion mechanisms and the correlation between film deposition parameters and corrosion protection ability are investigated. Nanopores and nanowires In collaboration with Gesellschaft für Schwerionenforschung (GSI), membranes or microfilters are formed by irradiation of polymer foils (polycarbonate, polyimide) and chemical etching the latent ion tracks to pores. These ion track filters (ITNF: ion track nanofilters, when the pores have diameters < 100 nm) can be used for filtering liquids from particles, collecting aerosols, for gas separation, and for analyzing small molecules and molecular fragments by translocation. In a further process step, the nanopores are galvanically filled with metals, such as copper or gold, forming nanowires. The nanowires can be gained by dissolution of the polymer template. Dimensions, surface topography, microstructure, and crystallinity are investigated. Further, properties such as electrical conductivity and thermal stability are studied. The wires decay upon heating to a chain of spheres (Rayleigh instability). This effect is investigated. Materials in Radiation Fields In a number of applications, such as in nuclear facilities, particle accelerators and in space, materials are exposed to energetic ionizing radiation. The irradiation may lead to a degradation of the materials properties. Polymers are particularly sensitive towards ionizing radiation. In a collaboration with GSI, polyimide and polyepoxide, which are components of superconducting beam guiding magnets, were irradiated with relativistic heavy ions and characterized for their properties, such as network degradation and electrical conductivity. Another material is polycrystalline graphite, which is being used as the target wheel and as the beam dump. - 45 -
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 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
Page 66 and 67: transition allows to investigate at
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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
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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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