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Hydration behavior of MgO single crystals and thin films

Published online by Cambridge University Press:  31 January 2011

Jung Heon Lee ,
Jae Hwan Eun ,
Soo Gil Kim ,
Sun Young Park ,
Mi Jung Lee  and
Hyeong Joon Kim
Jung Heon Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Jae Hwan Eun
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Soo Gil Kim
Affiliation:
Department of Electronic Engineering, Kyungwon University, Seongnam 461-701, Korea
Sun Young Park
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Mi Jung Lee
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Hyeong Joon Kim
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
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Abstract

MgO single crystals and thin films were intentionally hydrated to determine the critical factors affecting the hydration behavior. The degree of hydration was affected by the crystallographic orientation in the initial stages. The (111) plane showed a higher tendency to hydrate than (100). The shape of the hydration clusters also differed according to the orientation of MgO single crystals. After long-term hydration, the density and grain size appeared to influence the hydration along with the orientation. On low-density thin films, Mg atoms are easily supplied to the surface, which induces large hydration clusters. As the grain boundary area increased, the number of nucleation sites for the formation of hydration clusters increased, which increases the number of clusters. Hydration also occurred in the inner part of thin films. The density of thin films is the most important property in this case because it governs the diffusion of Mg atoms, water, and OH through the thin films.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 12 , December 2003 , pp. 2895 - 2903
Copyright
Copyright © Materials Research Society 2003

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