High-resolution transmission electron microscopy observations of La2Zr2O7 thin layers on LaAlO3 obtained by chemical methods
| Autor: | Cyrille Millon, Tristan Caroff, François Weiss, Stéphanie Morlens, Carmen Jiménez, Laetitia Rapenne, Pascale Bayle-Guillemaud |
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| Rok vydání: | 2009 |
| Předmět: |
Reflection high-energy electron diffraction
Materials science Thin layers Mechanical Engineering Pyrochlore Analytical chemistry 02 engineering and technology Chemical vapor deposition engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Mechanics of Materials 0103 physical sciences engineering Energy filtered transmission electron microscopy General Materials Science Metalorganic vapour phase epitaxy Thin film 010306 general physics 0210 nano-technology High-resolution transmission electron microscopy |
| Zdroj: | Journal of Materials Research. 24:1480-1491 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2009.0162 |
| Popis: | La2Zr2O7 (LZO) films have been grown by metalorganic decomposition (MOD) to be used as buffer layers for coated conductors. LZO can crystallize into two similar structures: fluorite or pyrochlore. Coated conductor application focuses on pyrochlore structure because it is a good barrier against oxygen diffusion. Classical x-ray diffraction is not able to separate the contribution of these two structures. Transmission electron microscopy and high-resolution transmission electron microscopy were used to determine the local distribution of these two phases in epitaxial LZO layers grown on LaAlO3. A characteristic feature of LZO thin films deposited by MOD is the formation of nanovoids in an almost single-crystal structure of LZO pyrochlore phase. For comparison, LZO layers deposited by metalorganic chemical vapor deposition were also studied. In this last case, the film is compact without voids and the structure corresponds to pyrochlore phase. Thus, the formation of nanovoids is a characteristic feature of MOD grown films. |
| Databáze: | OpenAIRE |
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