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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2006     Display Documents



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ID: 273507.0, MPI für Festkörperforschung / FKF Publikationen 2006
Direct observation of crystallographic and chemical changes during dehydrogenation of oxygen contaminated La2C3H1.5
Authors:Kienle, L.; Garcia, F. J. G.; Duppel, V.; Simon, A.
Language:English
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Journal of Solid State Chemistry
Volume:179
Issue / Number:4
Start Page:993
End Page:1002
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The amorphous product, La2C3H1.5, formed by reaction of crystalline
La2C3 With hydrogen at 170 degrees C has been investigated by electron
microscopy. Electron beam induced hydrogen loss leads to full
crystallinity via paracrystalline intermediates with distorted face
centered Cubic (fee) Substructure of the La atoms. Progressive
transformation results in a separation into distinct phases and to
significant strain, which finally produces a fragmentation of the
particles. While La2C3 is recovered in the core of the particles,
traces of oxygen contamination are Captured in perfectly crystalline
La2O3 (A- and C-type) on the Surface, which is embedded in a matrix of
LaC2. The preferred orientations of all crystalline phases depend on
the average structure of the paracrystalline intermediate. (c) 2005
Elsevier Inc. All rights reserved.
Free Keywords:electron microscopy; lanthanumcarbidehydride; paracrystal; in situ
transformation
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Festkörperforschung
External Affiliations:Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
Identifiers:ISI:000236501300005 [ID No:1]
ISSN:0022-4596 [ID No:2]
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