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Electrochemical SPM study of 2D phase and 3D phase formation of Zn at the ionic liquid / Au(111) interface [online]

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ISBN: 3937300090 Year: DOI: 10.5445/KSP/1132004 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Chemistry (General)
Added to DOAB on : 2019-07-30 20:01:58

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Zn electrodeposition in the under- (UPD) and overpotential (OPD) ranges by means of in-situ Scanning Tunneling Microscopy (STM) was examined, supported by in-situ cyclic voltammetry and chronoamperometrie. The underpotential deposition of Zn follows a layer-by-layer growth. For the first time the formation of three successive Zn monolayers has been observed in the UPD range. It has been shown, that the UPD of Zn is complicated due to surface alloying. The same growth mechanism extends from the UPD into OPD range until Al bulk deposition sets in. The UPD of Al at 100 mV vs. Zn/Zn(II) is marked by Moiré pattern formation. For the first time in this system the effective tunneling barrier f has been measured by STS. A first insight into the 2D phase formation of electrodeposited Zn at the electrolyte / electrode interface was obtained from STM images at various times and potentials. Before a coherent layer is formed wormlike structures are observed characteristic of spinodal decomposition. This implies a first order phase transition, which has been resolved here for the first time for 2D electrodeposition.

Modeling of Helium Bubble Nucleation and Growth in Neutron Irradiated RAFM Steels

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783866449015 Year: Volume: 6 Pages: XXII, 159 p. DOI: 10.5445/KSP/1000029282 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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Reduced Activation Ferritic/Martensitic (RAFM) steels are first candidate structural materials in future fusion technology. In this work a physically based model using Rate Theory is developed to describe nucleation and growth of helium bubbles in neutron irradiated RAFM steels. Several modifications of the basic diffusion limited model are presented allowing a comprehensive view of clustering effects and their influence on expected helium bubble size distributions.

Grain growth behavior and efficient large scale simulations of recrystallization with the phase-field method

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731502807 Year: Volume: 44 Pages: VI, 136 p. DOI: 10.5445/KSP/1000043520 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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This book summarizes the found insights of grain growth behavior, of multidimensional decomposition for regular grids to efficiently parallelize computing and how to simulate recrystallization by coupling the finite element method with the phase-field method for microstructure texture analysis. The frame of the book is created by the phase-field method, which is the tool used in this work, to investigate microstructure phenomena.

Fraktale Doppel-Boom-Zyklen und Querschnittstechnologien: Theorie, Empirie und Politikimplikationen am Beispiel der Nanotechnologie

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ISBN: 9783731504368 Year: Pages: XIX, 229 p. DOI: 10.5445/KSP/1000049667 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Business and Management
Added to DOAB on : 2019-07-30 20:02:00
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In a majority of knowledge-intensive technologies, empirical studies show characteristic double boom patterns of research activities. After an initial increase of efforts, research activities drop, only to rise again after a certain period. As a reason for this interim weakening the literature presumes a temporary disillusionment among economic actors. The present work questions this assumption. Instead, it is argued that a general purpose technology is replacing its techno-economic predecessor.

Microstructure evolution in strontium titanate Investigated by means of grain growth simulations and x-ray diffraction contrast tomography experiments

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731502425 Year: Volume: 40 Pages: XIV, 146 p. DOI: 10.5445/KSP/1000042175 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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Understanding the physical processes during fabrication and annealing of ceramic materials is a long sought goal among material scientists. Using strontium titanate as a model system for perovskite ceramics, the present work combines advanced non-destructive 3D characterization techniques and computational modeling of microstructure evolution in order to link grain morphology, interface anisotropy and microstructure evolution to macroscopic physical properties .

New contributions to R-curves and bridging stresses - Applications of weight functions

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783866448360 Year: Volume: 3 Pages: VII, 231 p. DOI: 10.5445/KSP/1000027303 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
Added to DOAB on : 2019-07-30 20:02:02
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Most ceramics show an increase of the crack growth resistance during crack propagation (R-curve behaviour). Reasons for such behaviour are bridging effects between opposite crack surfaces, phase transformations around the tip of a crack, and development of micro-cracking zones. This booklet predominantly deals with the bridging behaviour and the discussion of the observed effects in terms of the fracture mechanics weight function procedure.

The Effects of Internal Stress and Lithium Transport on Fracture in Storage Materials in Lithium-Ion Batteries

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Book Series: Schriftenreihe des Instituts für Angewandte Materialien, Karlsruher Institut für Technologie ISSN: 21929963 ISBN: 9783731504559 Year: Volume: 54 Pages: IX, 216 p. DOI: 10.5445/KSP/1000050956 Language: ENGLISH
Publisher: KIT Scientific Publishing
Subject: Technology (General)
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Fracture of storage particles is considered to be one of the major reasons for capacity fade and increasing power loss in Li-ion batteries. In this work, we tackle the problem by merging a coupled model of mechanical stress and diffusion of Li-ions with a phase field description of an evolving crack. The novel approach allows us to study the evolution of the Li concentration together with the initiation and growth of a crack in an arbitrary geometry and without presuming a specific crack path.

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