Formation of small metallic precipitates of niobium in α-Al2O3 implanted with niobium ions
| Autor: | M. Brunel, Stella M. M. Ramos, L.L. Horton, Laurence Romana, Carl J. McHargue, P. Thevenard, L. Gea, Bruno Canut |
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| Přispěvatelé: | Université des Antilles (UA), Groupe de Technologie des Surfaces et Interfaces (GTSI), INL - Spectroscopies et Nanomatériaux (INL - S&N), Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 1992 |
| Předmět: |
Materials science
Photoemission spectroscopy Analytical chemistry Niobium Oxide chemistry.chemical_element 02 engineering and technology 01 natural sciences Ion [SPI]Engineering Sciences [physics] chemistry.chemical_compound X-ray photoelectron spectroscopy 0103 physical sciences Materials Chemistry ComputingMilieux_MISCELLANEOUS [PHYS]Physics [physics] 010302 applied physics Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Surfaces Coatings and Films Chemical state Ion implantation chemistry 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology Surface and Coatings Technology, Elsevier, 1992, 51 (1-3), pp.410-414. ⟨10.1016/0257-8972(92)90273-D⟩ |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/0257-8972(92)90273-d |
| Popis: | Niobium implantations were performed in α-Al2O3 single crystals to study the chemical interactions between the implanted species and the oxide and to study the microstructural evolution of the implanted layer. The investigation focused on both as-implanted and the oxide and to study the microstructural evolution of the implanted layer. The investigation focused on both as-implanted specimens and specimens that underwent post-implantation anneals in a reducing atmosphere. Ion implantations were performed at 300 K with 150 keV particle energies and fluences ranging from 1016 to 2 × 1017 ions cm-2. Rutherford backscattering spectroscopy (RBS) and X-ray photoemission spectroscopy (XPS) allowed the characterization of the implanted profiles and determination of the chemical state of the implanted ions. X-ray diffraction at glancing incidence and RBS analysis in a channeling geometry were performed to follow the microstructural evolution of the implanted layer. The oxidation state of niobium and the microstructure of the implanted layer were dependent on the atomic concentration of niobium in α-Al2O3. An amorphous phase was observed after a threshold fluence of 5 × 1016 ions cm-2. The amorphous phase contained small metallic precipitates of niobium with a mean diameter of 1 nm. The physical properties of such niobium clusters embedded in an amorphous oxide layer were studied in detail. Electrical conductivity measurements showed that a hopping process between the metallic precipitates was the likely mechanism operating for this system. |
| Databáze: | OpenAIRE |
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