Fractoluminescence and Dislocation Density of Ionic Crystals after X-Ray Irradiation
Hiroki TANIO, Shoichi NAKAMURA and Tomiyasu OHGAKU
Abstract:Fractoluminescence(FL) has been observed by three bending tests of KCl single crystals doped with Ca2+, the size of which is 3~1~12mm3. FL has occurred only in the vicinity of fracture surface (within 0.3mm) and FL intensity as well as dislocation density has sharply decreased with increasing distance from fracture surface. And the dislocation density has approached to the initial one. Collecting data from many samples, it has been found that the FL intensity is proportional to the three-half power of the dislocationdensity. The relation between FL intensity and dislocation density has been explained by dislocation intersection. Key Words:Fractoluminescence, Dislocation, X-ray irradiation, Ionic Crystal