We investigate the simultaneous emission of electrons and photons during the deformation and fracture of two types of high-purity single-crystal MgO. These crystals exhibit significant differences in optical opacity due to differences in void and precipitate concentrations. Measurements of the emission of visible photons during deformation and prior to failure of the crystals are presented, along with the time dependencies of the photon and electron emission during and after fracture. Correlations with fracture strength and fractographic features are also discussed.
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Langford et al. (1987) studied this question.
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