Abstract
The fracture toughness of MgO has been studied as a function of the concentration of an intergranular LiF phase, added to enhance densification. The fracture toughness increases as lithium and fluorine are volatilized from the MgO while the fracture morphology changes from intergranular to transgranular. The data are interpreted with respect to competing embrittlement and crack-deflection toughening mechanisms, and a scheme is proposed for determining conditions for embrittlement and toughening.
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