O. Vlokh et al., ELASTOOPTIC LIGHT-DIFFRACTION ON THE DOMAIN-STRUCTURE OF PB-3(PO4)(2)FERROELASTIC CRYSTALS, Ferroelectrics, 191(1-4), 1997, pp. 427-431
The results of the investigation of elastooptic light diffraction on f
erroelastic domains in Pb-3(PO4)(2) crystals are submitted in this pap
er. The description of the orientation of the optical indicatrices in
various domains at the ferroelastic phase transition with a change of
symmetry (3) over bar m --> 2/m is made. The temperature and angular d
ependencies of the diffraction efficiency are obtained. It is found th
at most probably the change of the diffraction angle wih temperature i
s connected to the change of the orientation of W'-domain walls.