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Effect of Temperature and Vapor-phase Encapsulation on Particle Growth and Morphology

Published online by Cambridge University Press:  31 January 2011

Sheryl H. Ehrman ,
Maria I. Aquino-Class  and
Michael R. Zachariah
Sheryl H. Ehrman*
Affiliation:
Chemical Science and Technology Laboratory, Building 221, Room B312, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Maria I. Aquino-Class
Affiliation:
Chemical Science and Technology Laboratory, Building 221, Room B312, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
Michael R. Zachariah
Affiliation:
Chemical Science and Technology Laboratory, Building 221, Room B312, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of in situ vapor phase salt-encapsulation on particle size and morphology was systematically investigated in a sodium co-flow/furnace reactor. The temperature of the furnace was varied, and the primary particle size and degree of agglomeration of the resulting silicon and germanium particles were determined from transmission electron micrograph images of particles sampled in situ. Particle size increased with increasing temperature, a trend expected from our understanding of particle formation in a high-temperature process in the absence of an encapsulant. Germanium, which coalesces faster than silicon, formed larger particles than silicon at the same temperatures, also in agreement with observations of particle growth in more traditional aerosol processes. At the highest temperatures, unagglomerated particles were formed, while at low temperatures, agglomerated particles were formed, with agglomerate shape following the shape of the salt coating.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1664 - 1671
Copyright
Copyright © Materials Research Society 1999

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