Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1680902 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2012 | 4 Pages |
Abstract
Ion induced phase transformation from the soft graphitic hexagonal boron nitride (h-BN) to ultrahard cubic boron nitride (c-BN) nanoparticles is presented in the work herein. Ion implantation was used as a technique to introduce boron lithium and helium ions, at the energy of 150Â keV and fluences ranging from 1Â ÃÂ 1014 to 1Â ÃÂ 1016Â ions/cm2, into hot pressed, polycrystalline h-BN. Analyses using Raman Spectroscopy showed that He+, Li + and B+ led to a h-BN to c-BN phase transition, evident from the longitudinal optical (LO) Raman phonon features occurring in the implanted samples' spectra. The nature of these phonon peaks and their downshifting is explained using the spatial phonon correlation model.
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Authors
Emily Aradi, Rudolph M. Erasmus, Trevor E. Derry,