Structure relaxation and crystallization of the CoW-CoNiW-NiW electrodeposited alloys
| Autor: | O. V. Voitenko, Aleksander V. Dubinets, E. V. Pustovalov, Vladimir S. Plotnikov, B. N. Grudin, Aleksander N. Fedorets, S. S. Grabchikov, Evgeny Modin |
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| Jazyk: | angličtina |
| Předmět: |
EELS
Materials science Analytical chemistry Crystal growth 79.20 Uv EDS law.invention In situ experiments Materials Science(all) law Scanning transmission electron microscopy Electron microscopy General Materials Science 61.46.-w Crystallization High-resolution transmission electron microscopy Surface diffusion Nano Express Electron energy loss spectroscopy Condensed Matter Physics Nanocrystalline material 68.37.Ma Nanocrystalline CoW-CoNiW-NiW alloys Crystallography Transmission electron microscopy HAADF STEM |
| Zdroj: | Nanoscale Research Letters |
| ISSN: | 1556-276X |
| DOI: | 10.1186/1556-276x-9-66 |
| Popis: | The structure of electrolytically deposited nanocrystalline alloys of the CoW-CoNiW-NiW systems under low-temperature heating was investigated by means of high-resolution transmission electron microscopy (HRTEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF STEM), and analytical methods such as energy dispersive x-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS). Structural relaxation and crystallization were investigated at temperatures of 200°C to 300°C. The structural and compositional inhomogeneities were found in the CoW-CoNiW-NiW alloys, while the local changes in composition were found to reach 18 at.%. Nanocrystals in the alloys grew most intensely in the presence of a free surface, and we found their nuclei density to range from 2 × 1023 /m3 to 3 × 1023 /m3. It was determined that the local diffusion coefficient ranged from 0.9 to 1.7 10-18 m2/s, which could be explained by the prevalence of surface diffusion. The data gathered in these investigations can be used to predict the thermal stability of CoW-CoNiW-NiW alloys. |
| Databáze: | OpenAIRE |
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