A combinatorial investigation of sputtered Ta-Al-C thin films
We describe a combinatorial experiment investigating the Ta–Al–C material system, conducted with the aim of determining why the tantalum-containing Mn + 1AXn phases have so far proved to be not amenable to thin-film synthesis. Samples were deposited onto (0001) Al2O3 wafers at 850 °C and characteriz...
| Main Authors: | , , |
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| Format: | Journal Article |
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Elsevier S.A.
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/18171 |
| _version_ | 1848749668564992000 |
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| author | Tucker, Mark Bilek, M. McKenzie, D. |
| author_facet | Tucker, Mark Bilek, M. McKenzie, D. |
| author_sort | Tucker, Mark |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We describe a combinatorial experiment investigating the Ta–Al–C material system, conducted with the aim of determining why the tantalum-containing Mn + 1AXn phases have so far proved to be not amenable to thin-film synthesis. Samples were deposited onto (0001) Al2O3 wafers at 850 °C and characterized by X-ray diffraction wafer maps, scanning electron microscopy, and surface optical scattering. Elemental Ta, the binary phases TaC, Ta2C, and TaAl3, and the ternary phases Ta3Al2C and Ta5Al3C were identified. The morphology, phase composition and preferred orientation of the films deposited were found to be highly sensitive to the Ta fraction of the incident flux during deposition. No MAX phase material was observed, indicating that the Ta-containing MAX phases do not form under the deposition conditions investigated. Explanations associated with inadequate coverage of stochiometries, preferential sputtering, and thermodynamic instability have been ruled out. An explanation based on reduced surface diffusion of Ta during growth is proposed. A substantially higher substrate temperature during deposition is likely to be required to synthesize Ta-containing MAX phases. |
| first_indexed | 2025-11-14T07:24:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-18171 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:24:36Z |
| publishDate | 2014 |
| publisher | Elsevier S.A. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-181712019-02-19T04:27:51Z A combinatorial investigation of sputtered Ta-Al-C thin films Tucker, Mark Bilek, M. McKenzie, D. Combinatorial Tantalum MAX phase We describe a combinatorial experiment investigating the Ta–Al–C material system, conducted with the aim of determining why the tantalum-containing Mn + 1AXn phases have so far proved to be not amenable to thin-film synthesis. Samples were deposited onto (0001) Al2O3 wafers at 850 °C and characterized by X-ray diffraction wafer maps, scanning electron microscopy, and surface optical scattering. Elemental Ta, the binary phases TaC, Ta2C, and TaAl3, and the ternary phases Ta3Al2C and Ta5Al3C were identified. The morphology, phase composition and preferred orientation of the films deposited were found to be highly sensitive to the Ta fraction of the incident flux during deposition. No MAX phase material was observed, indicating that the Ta-containing MAX phases do not form under the deposition conditions investigated. Explanations associated with inadequate coverage of stochiometries, preferential sputtering, and thermodynamic instability have been ruled out. An explanation based on reduced surface diffusion of Ta during growth is proposed. A substantially higher substrate temperature during deposition is likely to be required to synthesize Ta-containing MAX phases. 2014 Journal Article http://hdl.handle.net/20.500.11937/18171 10.1016/j.tsf.2014.02.086 Elsevier S.A. fulltext |
| spellingShingle | Combinatorial Tantalum MAX phase Tucker, Mark Bilek, M. McKenzie, D. A combinatorial investigation of sputtered Ta-Al-C thin films |
| title | A combinatorial investigation of sputtered Ta-Al-C thin films |
| title_full | A combinatorial investigation of sputtered Ta-Al-C thin films |
| title_fullStr | A combinatorial investigation of sputtered Ta-Al-C thin films |
| title_full_unstemmed | A combinatorial investigation of sputtered Ta-Al-C thin films |
| title_short | A combinatorial investigation of sputtered Ta-Al-C thin films |
| title_sort | combinatorial investigation of sputtered ta-al-c thin films |
| topic | Combinatorial Tantalum MAX phase |
| url | http://hdl.handle.net/20.500.11937/18171 |