𝔖 Bobbio Scriptorium
✦   LIBER   ✦

On the cleavage energy of magnesium oxide

✍ Scribed by S. Boffi; M. Ricci

Publisher
Elsevier Science
Year
1976
Weight
272 KB
Volume
1
Category
Article
ISSN
0390-6035

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✦ Synopsis

The cleavage process of MgO is investigated in terms of a phase transition promoted by an applied mechanical stress. The model requires knowledge of the eigenfrequencies and eigenvectors of the normal modes of vibration, as well as an anal~/.tical definition of the critical interplanar displacement appropriate to the cleavage mode. The present results are in better agreement with experiment than those obtained in other theoretical calculations.

SURFACE ENERGY AND CLEAVAGE

In recent years, interest has been concentrated on ceramic materials, such as MgO, due to their mechanical and thermal properties.

The wide spectrum of technological applications stems from their possibility of operating at high temperatures and in the elastic region up to relatively large stresses. However, at least at ordinary temperatures ceramics cannot undergo plastic deformation even at stresses appro-

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