Plastic Deformation of Single-Crystal Diamond Nanopillars

Blake Regan, Alireza Aghajamali, Johannes Froech, Toan Trong Tran, John Scott, James Bishop, Irene Suarez-Martinez, Ying Liu, Julie M. Cairney, Nigel A. Marks, Milos Toth, Igor Aharonovich

Research output: Contribution to journalArticlepeer-review

25 Citations (Web of Science)


Diamond is known to possess a range of extraordinary properties that include exceptional mechanical stability. In this work, it is demonstrated that nanoscale diamond pillars can undergo not only elastic deformation (and brittle fracture), but also a new form of plastic deformation that depends critically on the nanopillar dimensions and crystallographic orientation of the diamond. The plastic deformation can be explained by the emergence of an ordered allotrope of carbon that is termed O8-carbon. The new phase is predicted by simulations of the deformation dynamics, which show how the sp(3) bonds of (001)-oriented diamond restructure into O8-carbon in localized regions of deforming diamond nanopillars. The results demonstrate unprecedented mechanical behavior of diamond, and provide important insights into deformation dynamics of nanostructured materials.

Original languageEnglish
Article number1906458
Number of pages7
JournalAdvanced Materials
Issue number9
Publication statusPublished - 1 Mar 2020
Externally publishedYes


Dive into the research topics of 'Plastic Deformation of Single-Crystal Diamond Nanopillars'. Together they form a unique fingerprint.

Cite this