Main supervisor (name and email)<br>and his / her institution
Prof. Trevor E. Derry
University of the Witwatersrand
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Abstract content <br> (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>
The extreme properties of cubic BN (c-BN), similar to or even superior to diamond, have led to a great deal of research on techniques for its synthesis. The study herein focuses on the synthesis of c-BN from the hexagonal phase (h-BN) by radiation effect using the ion implantation process. The effect of varying implantation parameters including the ion mass, the ion fluence (1×1014 - 1×1015 ions/cm2), the implantation energy (30 - 150 keV) and implantation temperature, with respect to the end-products are investigated. The presence of the c-BN phase is inferred using glancing incidence XRD (GIXRD) at glancing angles 0.01 ≤ ω ≤ 0.5o and Scanning Transmission Electron Microscopy (STEM). The GIXRD pattern after implantation exhibited c-BN and r-BN. These diffraction peaks were determined to be dependent on the incident glancing angle’s penetration depth for the X-rays, which corresponded to the penetration depth of the different ions in h-BN from simulations. Transmission Electron Microscopy showed high density regions in h-BN after implantation with HRTEM lattice fringes with lattice parameter of the c-BN in the implanted region.
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