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Growth of Boron Carbide Crystals from a Copper Flux

Published online by Cambridge University Press:  31 January 2011

Yi Zhang ,
James Edgar ,
Jack Plummer ,
Clinton Whiteley ,
Hui Chen ,
Yu Zhang ,
Michael Dudley ,
Yinyan Gong ,
James Gray  and
Martin Kuball
Yi Zhang
Affiliation:
[email protected], Kansas State University, Chemical Engineering, Manhattan, Kansas, United States
James Edgar
Affiliation:
[email protected], Kansas State University, Chemical Engineering, Manhattan, United States
Jack Plummer
Affiliation:
[email protected], Kansas State University, Chemical Engineering, Manhattan, Kansas, United States
Clinton Whiteley
Affiliation:
[email protected], Kansas State University, Chemical Engineering, Manhattan, Kansas, United States
Hui Chen
Affiliation:
[email protected], Stony Brook University, Materials Science and Engineering, Stony Brook, New York, United States
Yu Zhang
Affiliation:
[email protected], Stony Brook University, Materials Science and Engineering, Stony Brook, New York, United States
Michael Dudley
Affiliation:
[email protected], Stony Brook University, Materials Science and Engineering, Stony Brook, New York, United States
Yinyan Gong
Affiliation:
[email protected], University of Bristol, H.H.Wills Physics Laboratory, Bristol, United Kingdom
James Gray
Affiliation:
[email protected], University of Bristol, H.H.Wills Physics Laboratory, Bristol, United Kingdom
Martin Kuball
Affiliation:
[email protected], University of Bristol, H.H.Wills Physics Laboratory, Bristol, United Kingdom
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Abstract

Boron carbide crystals ranging in size from 50 microns to several millimeters have been grown from a copper-boron carbide flux at temperatures from 1500°C to 1750°C. The crystal size increased with growth temperature although copper evaporation limited growth at the higher temperatures. Synchrotron X-ray Laue patterns were indexed according to (001) orientation boron carbide structure, indicating the bulk crystals were single crystalline with {001} growth facets. Raman spectrum of boron carbide indicates an improved crystal quality compared to the source powder, but peaks of crystals grown from 11B -enriched source shifted to the lower energy by 1-4 cm−1 from literature values, possibly due to the boron isotope dependency. Five fold symmetry defects and twin planes were common as observed by optical microscope and scanning electron microscope. Raindrop shape etch pits were formed after defect selective etching in molten potassium hydroxide at 600°C for 6 minutes. Typically, the etch pit density was on the order of 106/cm2.

Keywords

crystal growthflux growthneutron irradiation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1164: Symposium L – Nuclear Radiation Detection Materials–2009 , 2009 , 1164-L06-02
Copyright
Copyright © Materials Research Society 2009

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