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Microcracks in CVD diamond produced by scaife polishing
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Saho, Ebrima, Hindmarsh, Steven A., Sánchez, Ana M., Birks, Fraser, Kermode, James R., Dale, M. W., Fisher, David and Beanland, R. (2024) Microcracks in CVD diamond produced by scaife polishing. Diamond & Related Materials, 144 . 111008. doi:10.1016/j.diamond.2024.111008 ISSN 0925-9635.
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Official URL: https://doi.org/10.1016/j.diamond.2024.111008
Abstract
We investigate sub-surface damage in a CVD diamond, polished on a (110) plane using the traditional scaife method. The damage lies in tracks that consist of microcracks lying perpendicular to the polishing direction. These cracks have an irregular spacing and are comprised mainly of {111} facets. Their geometry is consistent with a modified Hertzian fracture, caused by a stick-slip movement of relatively large (micron-sized) diamond particles on the scaife. The interior surface of the cracks shows a 1x1 CH3 surface reconstruction, consistent with a high hydrogen overpressure that results from ingress of hydrocarbons in the polishing lubricant and a relatively low temperature process. The crack edge is ragged, and voids with sizes of a few nm are found up to hundreds of nm from the crack front, particularly where the crack ends at the polished surface. We propose that these features are evidence of significant healing of the cracks once the applied stress is removed. Luminescence at the crack tips is seen, presumably due to impurities trapped in these voids, which quenches with electron irradiation at 10 keV.
Item Type: | Journal Article | ||||||||||||
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Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology T Technology > TT Handicrafts Arts and crafts |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Physics Other > Research Technology Platforms |
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Library of Congress Subject Headings (LCSH): | Diamonds, Artificial , Diamonds, Artificial -- Industrial applications, Diamonds, Artificial -- Surfaces, Diamond turning , Cathodoluminescence | ||||||||||||
Journal or Publication Title: | Diamond & Related Materials | ||||||||||||
Publisher: | Elsevier | ||||||||||||
ISSN: | 0925-9635 | ||||||||||||
Official Date: | April 2024 | ||||||||||||
Dates: |
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Volume: | 144 | ||||||||||||
Article Number: | 111008 | ||||||||||||
DOI: | 10.1016/j.diamond.2024.111008 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||
Date of first compliant deposit: | 14 March 2024 | ||||||||||||
Date of first compliant Open Access: | 15 March 2024 | ||||||||||||
RIOXX Funder/Project Grant: |
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