Local investigation of the emissive properties of LaB$_6$–ZrB$_2$ eutectics

Marie-Hélène Berger 1 T. C. Back 2, 3 P. Soukiassian 4 D. Martinotti 5 L. Douillard 5 S. B. Fairchild 3 J. J. Boeckl 3 V. Filipov 6 A. Sayir 7
1 MAT - Centre des Matériaux
2 University of Dayton
3 AFRL - Air Force Research Laboratory
4 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
5 LEPO - Laboratoire d'Electronique et nanoPhotonique Organique
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
6 NASU - National Academy of Sciences of Ukraine
7 NASA Glenn Research Center
Abstract : LaB$_6$–ZrB$_2$ composites obtained by directional solidification at eutectic composition have been investigated by low-energy electron microscopy (LEEM) and thermal emission electron microscopy (ThEEM). The transitions from the mirror electron microscopy mode to the LEEM mode for the hexa- and diborides indicate lower work functions of the two phases when embedded in the composite compared to the corresponding single phases. In the composite, the work function of the ZrB2 fibers is similar to that of the matrix and ThEEM images display a brighter contrast for the fibers. This is explained by the thermally activated diffusion of La on the fiber surface.
Document type :
Journal articles
Complete list of metadatas

Cited literature [18 references]  Display  Hide  Download
https://hal-cea.archives-ouvertes.fr/cea-01484778
Contributor : Dominique Girard <>
Submitted on : Wednesday, June 7, 2017 - 5:21:04 PM
Last modification on : Monday, September 23, 2019 - 11:48:01 AM
Long-term archiving on : Friday, September 8, 2017 - 1:21:38 PM

File

Douill.pdf
Publisher files allowed on an open archive

Identifiers

Collections

CEA | CNRS | INSTITUT-TELECOM | DSM-IRAMIS | IRAMIS-SPEC | PSL | ENSMP | UNIV-PARIS-SACLAY | PARISTECH | ENSMP_MAT | CEA-DRF | CEA-UPSAY

Citation

Marie-Hélène Berger, T. C. Back, P. Soukiassian, D. Martinotti, L. Douillard, et al.. Local investigation of the emissive properties of LaB$_6$–ZrB$_2$ eutectics. Journal of Materials Science, Springer Verlag, 2017, 52, pp.5537-5543. ⟨10.1007/s10853-017-0816-0⟩. ⟨cea-01484778⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

459

Files downloads

322

Contact

CCSD