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Solid solution directionally solidified eutectic oxide composites: Part II. Co1-xNixO single-crystal growth and characterization

Published online by Cambridge University Press:  31 January 2011

L. N. Brewer ,
V. P. Dravid ,
M. Velázquez  and
A. Revcolevschi
L. N. Brewer
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
V. P. Dravid
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
M. Velázquez
Affiliation:
Laboratoire de Physico-chimie de l'Etat Solide, Universite’ de Paris—Sud Centre d'Orsay, France
A. Revcolevschi
Affiliation:
Laboratoire de Physico-chimie de l'Etat Solide, Universite’ de Paris—Sud Centre d'Orsay, France
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Abstract

The growth and structure of the Co1−xNixO series of single crystals with 0 ≤ x ≤ 1 were investigated with the goal of achieving a single-phase crystal over several centimeters of bulk growth. The single crystals were grown via the floating zone method controlling the partial pressure of oxygen to prevent secondary phase precipitation. The resulting crystals were single phase for all compositions. CoO was a single-domain crystal but contained microvoids. The lattice parameters followed a rule-of-mixtures trend, but the coefficient of thermal expansion exhibited a maximum in the middle of the solid solution, which was attributed to enhanced vacancy formation.

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Articles
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Journal of Materials Research , Volume 17 , Issue 4 , April 2002 , pp. 768 - 773
Copyright
Copyright © Materials Research Society 2002

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