Low-angle Boundary in High-temperature Scintillating Crystal Ce:YAP

Two kinds of low-angle boundary (mosaic structure) in Ce:YAP were observed by etching figures and rocking-curve. From SEM figure, the boundary angle on (010) plane estimated is 51. The rocking-curve by four-crystal high-resolution XRD shows that the boundary angle on the plane paralleled with [010] is 58. The FWHM (Full Width-Half Maximum) of rocking-curve is 54, and the one of ideal YAP crystal calculated out is 17 according to Darwin's theory. The integrality of Ce:YAP sample was analyzed on the basis of these result.