Crystallographic Distribution of Internal Interfaces in Spinel Polycrystals

Abstract:

Measurements of the grain boundary character distribution in MgAl2O4 (spinel) as a function of lattice misorientation and boundary plane orientation show that at all misorientations, grain boundaries are most frequently terminated on {111} planes. Boundaries with {111} orientations are observed 2.5 times more frequently than boundaries with {100} orientations. Furthermore, the most common boundary type is the twist boundary formed by a 60° rotation about the [111] axis. {111} planes also dominate the external form of spinel crystals found in natural settings, and this suggests that they are low energy and/or slow growing planes. The mechanisms that might lead to a high population of these planes during solid state crystal growth are discussed.

• Periodical: Materials Science Forum (Volumes 467-470)
• Pages: 783-788
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.467-470.783
• Online since: October 2004
• Authors: Herbert M. Miller, David Saylor, Bassem S. El Dasher, Anthony D. Rollett, Gregory S. Rohrer
• Keywords: Stereology, Grain Boundary Character Distribution (GBCD), Grain Boundary Plane, Spinel

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