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Orientation relationship and interfaces in nonfaceted-nonfaceted ZrO2(c)–CaZrO3 lamellar eutectics

Published online by Cambridge University Press:  31 January 2011

A. Larrea ,
V. M. Orera ,
J. I. Peña  and
R. I. Merino
A. Larrea
Affiliation:
Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas–Universidad de Zaragoza, María de Luna 3, E-50015 Zaragoza, Spain
V. M. Orera
Affiliation:
Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas–Universidad de Zaragoza, María de Luna 3, E-50015 Zaragoza, Spain
J. I. Peña
Affiliation:
Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas–Universidad de Zaragoza, María de Luna 3, E-50015 Zaragoza, Spain
R. I. Merino
Affiliation:
Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas–Universidad de Zaragoza, María de Luna 3, E-50015 Zaragoza, Spain
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Abstract

The orientation relationship and the interfaces of ZrO2(c)–CaZrO3 unidirectional solidified eutectics have been investigated by means of electron diffraction and transmission electron microscopy (TEM). In contrast to previous studies on lamellar oxide-oxide systems, neither a constant orientation relationship between contiguous lamellae nor low-index interfaces are observed in this eutectic. As for metals and plastic crystals, it displays incoherent interfaces and nonfaceted growth. This unusual behavior is discussed in terms of entropy of fusion and related to the presence of oxygen vacancies in the ZrO2(c) phase.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2588 - 2593
Copyright
Copyright © Materials Research Society 1999

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