High-voltage electron microscopy of radiation damages in octacalcium phosphate

The present high-voltage electron microscopic study showed two types of radiation damages in OCP. The first type commenced with the formation of voids, which later grew and coalesced along the c-axis. The second type was characterized by the appearance of paired and concentric strain fields and the subsequent formation of dislocations. The origin of the strain fields is attributed tentatively to a precipitation of a second phase in the crystal.