The flexure strength and the intensity of the photon emission during fracture were measured to investigate a correlation between them on single crystal and polycrystalline MgO. Prior to the fracture, IR and UV/vis photons were emitted due to the plastic deformation only in the single crystal. At the moment of the fracture, intense IR and UV/vis photon emissions were observed in both of the single crystal and polycrystalline MgO. In the single crystal, the peak emission intensities of the UV/vis and IR photons…
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