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The Effect of Dopant Additions on the Microstructure of Boron Fibers Before and After Reaction to MgB2

Published online by Cambridge University Press:  01 February 2011

James V. Marzik ,
Raymond J. Suplinskas ,
William J. Croft ,
Warren J. MoberlyChan ,
John D. DeFouw  and
David C. Dunand
James V. Marzik
Affiliation:
Specialty Materials, Inc., Lowell, MA, U.S.A.
Raymond J. Suplinskas
Affiliation:
Specialty Materials, Inc., Lowell, MA, U.S.A.
William J. Croft
Affiliation:
Harvard University, Cambridge MA, U.S.A.
Warren J. MoberlyChan
Affiliation:
Harvard University, Cambridge MA, U.S.A.
John D. DeFouw
Affiliation:
Northwestern University, Evanston, IL, U.S.A.
David C. Dunand
Affiliation:
Northwestern University, Evanston, IL, U.S.A.
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Abstract

Boron fibers made by a commercial chemical vapor deposition (CVD) process have been used as precursors for the formation of magnesium diboride (MgB2) superconducting wires. Prior to a reaction with magnesium, the addition of dopants such as carbon and titanium to the boron fiber has been shown to enhance the superconducting properties of MgB2. These dopants also influence the kinetics of the reaction with magnesium. In this study, the effect of carbon dopant additions on the microstructure of boron fibers was investigated using powder x-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Additionally, bundles of boron fibers were pressure infiltrated with molten magnesium and reacted at elevated temperatures. The microstructure and microchemistry of the fiber-metal interfaces were investigated by TEM and energy dispersive x-ray analysis (EDS).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF6.2
Copyright
Copyright © Materials Research Society 2005

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References

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