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Method for measuring chemical diffusion coefficients in solids

Neuhaus, Dietmar (2010) Method for measuring chemical diffusion coefficients in solids. Applied Physics A: Materials Science & Processing, 100 (4), pp. 991-1000. Springer-Verlag. DOI: 10.1007/s00339-010-5956-x.

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Experiments were performed with temperature programmed desorption of hydrogen and deuterium adsorbates on small platinum spheres. Beyond the expected desorption peak of these adsorbates at around 300 K sample temperature an additonal desorption peak at higher temperatures was observed. This additional peak is explained by the diffusion of hydrogen or deuterium atoms from the inside of the spheres to their surfaces with final desorption from these surfaces. The visibility of this second high temperature desorption peak is supported by a small diameter of the platinum spheres. Platinum spheres with diameters arround 64 µm were used. The sample temperature at which the second peak was observed depends on the parameters: diameter of the spheres, heating rate of the sample and chemical diffusion coefficient of hydrogen or deuterium in platinum. A theory, which assumes that the chemical diffusion coefficient can be described with an Arrhenius ansatz, was developed to simulate the occurrence of the second peak. The combination of these kinds of experiments with the theory gives a method to measure chemical diffusion coefficients. This method can be called temperature programmed diffusion. At 510 K sample temperature the diffusion coefficient 1.61 x 10^-12 m²/s of hydrogen in platinum and the diffusion coefficient 1.40 x 10^-12 m²/s of deuterium in platinum was measured.

Document Type:Article
Title:Method for measuring chemical diffusion coefficients in solids
AuthorsInstitution or Email of Authors
Neuhaus, DietmarDietmar.Neuhaus@dlr.de
Journal or Publication Title:Applied Physics A: Materials Science & Processing
Refereed publication:No
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 991-1000
Keywords:Diffusion, Diffusionskoeffizient, Platin, Wasserstoff, Deuterium
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W - no assignement
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dr. Dietmar Neuhaus
Deposited On:22 Oct 2010 08:54
Last Modified:04 Apr 2013 16:21

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