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Journal Article

Direct observation of crystallographic and chemical changes during dehydrogenation of oxygen contaminated La2C3H1.5

MPS-Authors
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Kienle,  L.
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Duppel,  V.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanochemistry (Bettina V. Lotsch), Max Planck Institute for Solid State Research, Max Planck Society;

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Simon,  A.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kienle, L., Garcia, F. J. G., Duppel, V., & Simon, A. (2006). Direct observation of crystallographic and chemical changes during dehydrogenation of oxygen contaminated La2C3H1.5. Journal of Solid State Chemistry, 179(4), 993-1002.


Cite as: https://hdl.handle.net/21.11116/0000-000F-0349-C
Abstract
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.