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Main Title: Transitions of electrons and holes drive diffusion in crystals, glasses and melts
Translated Title: Übergänge von Elektronen und Löchern als Antrieb der Diffusion in Kristallen, Gläsern und Schmelzen
Author(s): Hoffmann, H.‐J.
Type: Article
Abstract: Diffusion of atoms or molecules (generally: particles) is driven by differences and gradients of the chemical potential of the particles in their accessible space. If the difference of the chemical potential is due to differences of concentrations alone, one arrives at the diffusion equations of Fick. The diffusion coefficients are described in known models by vibrations of atoms in condensed matter which cause the exchange of preferentially neutral particles with neighbouring particles, impurities, interstitial places and vacancies near or on surfaces, grain boundaries, dislocation lines and in the homogeneous bulk. The rates of electronic transitions, however, increase also in melts and solids of chemically bonded particles with increasing temperature. Such transitions cause large fluctuating deviations of the local energy, the charge distribution and the local chemical and electrical potentials. The fluctuating deviations interact with the core ions and drive particles to interchange. This mechanism that supplements the known mechanisms of diffusion has not yet found adequate attention in the literature until now. Foundations, experimental results, evidence and consequences for diffusion are discussed.
Subject(s): diffusion in solids
mechanism of diffusion
diffusion coefficient
diffusion and transitions of electrons and holes
Diffusion in Festkörpern
Diffusion und Übergänge von Elektronen und Löchern
Issue Date: 17-Dec-2020
Date Available: 25-Feb-2021
Language Code: en
DDC Class: 660 Chemische Verfahrenstechnik
Sponsor/Funder: TU Berlin, Open-Access-Mittel – 2020
Journal Title: Materialwissenschaft und Werkstofftechnik
Publisher: Wiley
Volume: 51
Issue: 12
Publisher DOI: 10.1002/mawe.201800158
Page Start: 1578
Page End: 1614
EISSN: 1521-4052
ISSN: 0933-5137
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Werkstoffwissenschaften und -technologien » FG Glaswerkstoffe
Appears in Collections:Technische Universität Berlin » Publications

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