Segregation von Wasserstoff und Deuterium an Versetzungen in Palladium

Maxelon, Michael

dc.contributor.advisor	Kirchheim, Reiner Prof. Dr.	de
dc.contributor.author	Maxelon, Michael	de
dc.date.accessioned	2000-12-13T15:10:12Z	de
dc.date.accessioned	2013-01-18T10:36:29Z	de
dc.date.available	2013-01-30T23:51:01Z	de
dc.date.issued	2000-12-13	de
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-0006-B0DC-9	de
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-2133
dc.format.mimetype	ContentType:application/pdf Size:1701	de
dc.language.iso	ger	de
dc.rights.uri	http://webdoc.sub.gwdg.de/diss/copyrdiss.htm	de
dc.title	Segregation von Wasserstoff und Deuterium an Versetzungen in Palladium	de
dc.type	doctoralThesis	de
dc.title.translated	Segregation of hydrogen and deuterium at dislocations in palladium	de
dc.contributor.referee	Kirchheim, Reiner Prof. Dr.	de
dc.date.examination	2000-04-26	de
dc.subject.dnb	540 Chemie	de
dc.description.abstracteng	Small angle neutron scattering (SANS) measurements on Pd samples containing dislocations with a high dislocation density reveal an additional intensity for a scattering vector of 0.02 to 0.2 1/ after loading with hydrogen or deuterium. The corresponding net cross section is proportional to the reciprocal scattering vector as expected for line type scattering objects with a superimposed exponential decrease stemming from scattering within the Guinier-regime. This experimental finding is in accordance with a model where extended segregation of H or D within the dilated regions of edge dislocations occurs. In a first order approximation this corresponds to a precipitation of cylindrically shaped hydrides along the dislocation line and can be treated quantitatively yielding radii in agreement with SANS data. Whereas gas volumetric measurements at the same total concentration reveal no difference for the amount of H- and D-segregation, there is a pronounced effective difference in SANS intensities which cannot be explained by the different scattering lengths alone. However, the different sign of the latter quantity in combinations with an expected volume expansion within the hydride/deuteride region provides a reasonable explanation of the intensity difference observed. Knowing the amount of segregated H or D from gas volumetry and the dislocation density from electron microscopy the SANS results can be explained in a self consistent way.	de
dc.contributor.coReferee	Felsch, Wolfgang Prof. Dr.	de
dc.subject.topic	Mathematics and Computer Science	de
dc.subject.eng	neutron scattering	de
dc.subject.eng	metals	de
dc.subject.eng	hydrides	de
dc.subject.eng	dislocations	de
dc.subject.eng	segregation	de
dc.subject.bk	51.10	de
dc.identifier.urn	urn:nbn:de:gbv:7-webdoc-917-4	de
dc.identifier.purl	webdoc-917	de
dc.affiliation.institute	Fakultät für Chemie	de
dc.subject.gokfull	RD	de
dc.subject.gokfull	RV	de
dc.identifier.ppn	502072601	de

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