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Stabilization of boron carbide via silicon doping

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Title: Stabilization of boron carbide via silicon doping
Authors: Proctor, JE
Bhakhri, V
Hao, R
Prior, TJ
Scheler, T
Gregoryanz, E
Chhowalla, M
Giulani, F
Item Type: Journal Article
Abstract: Boron carbide is one of the lightest and hardest ceramics, but its applications are limited by its poor stability against a partial phase separation into separate boron and carbon. Phase separation is observed under high non-hydrostatic stress (both static and dynamic), resulting in amorphization. The phase separation is thought to occur in just one of the many naturally occurring polytypes in the material, and this raises the possibility of doping the boron carbide to eliminate this polytype. In this work, we have synthesized boron carbide doped with silicon. We have conducted a series of characterizations (transmission electron microscopy, scanning electron microscopy, Raman spectroscopy and x-ray diffraction) on pure and silicon-doped boron carbide following static compression to 50 GPa non-hydrostatic pressure. We find that the level of amorphization under static non-hydrostatic pressure is drastically reduced by the silicon doping.
Issue Date: 14-Jan-2015
Date of Acceptance: 3-Nov-2014
URI: http://hdl.handle.net/10044/1/30964
DOI: 10.1088/0953-8984/27/1/015401
ISSN: 0953-8984
Publisher: IOP
Journal / Book Title: Journal of Physics: Condensed Matter
Volume: 27
Issue: 1
Copyright Statement: ©2014 IOP Publishing Ltd.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Defence Science and Technology Laboratory (DSTL)
Defence Science and Technology Laboratory (DSTL)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K028707/1
Dstlx - 1000045292
Keywords: 0204 Condensed Matter Physics
0912 Materials Engineering
1007 Nanotechnology
Fluids & Plasmas
Notes: journal_title: Journal of Physics: Condensed Matter article_type: paper article_title: Stabilization of boron carbide via silicon doping copyright_information: � 2015 IOP Publishing Ltd date_received: 2014-06-30 date_accepted: 2014-11-03 date_epub: 2014-11-27
Publication Status: Published
Article Number: 015401
Online Publication Date: 2014-11-27
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering