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Imaging the atomic structure and local chemistry of platelets in natural type Ia diamond

DOI: 10.1038/s41563-018-0024-6 DOI Help

Authors: E. J. Olivier (Nelson Mandela University) , J. H. Neethling (Nelson Mandela University) , R. E. Kroon (University of the Free State) , S. R. Naidoo (University of the Witwatersrand) , C. S. Allen (Diamond Light Source; University of Oxford) , Hidetaka Sawada (Diamond Light Source; University of Oxford) , P. A. Van Aken (Max Planck Institute for Solid State Research) , A. I. Kirkland (Diamond Light Source; University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Materials , VOL 17 , PAGES 243 - 248

State: Published (Approved)
Published: February 2018

Abstract: In the past decades, many efforts have been devoted to characterizing {001} platelet defects in type Ia diamond. It is known that N is concentrated at the defect core. However, an accurate description of the atomic structure of the defect and the role that N plays in it is still unknown. Here, by using aberration-corrected transmission electron microscopy and electron energy-loss spectroscopy we have determined the atomic arrangement within platelet defects in a natural type Ia diamond and matched it to a prevalent theoretical model. The platelet has an anisotropic atomic structure with a zigzag ordering of defect pairs along the defect line. The electron energy-loss near-edge fine structure of both carbon K- and nitrogen K-edges obtained from the platelet core is consistent with a trigonal bonding arrangement at interstitial sites. The experimental observations support an interstitial aggregate mode of formation for platelet defects in natural diamond.

Journal Keywords: Characterization and analytical techniques; Mechanical properties; Structural properties; Transmission electron microscopy

Subject Areas: Materials, Chemistry

Diamond Offline Facilities: Electron Physical Sciences Imaging Center (ePSIC)
Instruments: E01-JEM ARM 200CF