Speaker
Prof.
Trevor Derry
(University of the Witwatersrand)
Description
Hardness measurements of poly-crystalline hexagonal boron nitride (h-BN) ion implanted samples were carried out using the FM-700 (Vickers) micro-hardness tester. Previously, it has been shown that the implantation of h-BN with different ions structurally deforms the irradiated surface layer to cubic-BN nano-particles as revealed by Raman spectroscopy, X-ray diffraction and electron microscopy, and the measured hardness increases with ion fluence. In the present study, the h-BN samples were implanted with 150 keV helium (He+), lithium (Li+), boron (B+) and neon (Ne+) ions at different ion fluences from 1 x 1014 to 5 x 1016 ions/cm2, while varying the sample temperature from room temperature to 300oC. The stress, strain and Young's modulus of the formed cubic-BN nanoparticles were determined from micro-indentation measurements. The results show that maximum stress on the samples was induced at an ion dose of 5 x 1015 ions/cm2 and the calculated Young's modulus at that fluence was 0,3 GPa for all ions.
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Primary author
Mr
Lehlohonolo Lisema
(University of the Witwatersrand)
Co-authors
Dr
Emily Aradi
(University of Huddersfield, U.K.)
Morgan Madhuku
(iThemba LABS)
Dr
Ronald Machaka
(CSIR)
Prof.
Trevor Derry
(University of the Witwatersrand)
