Systematization of the relationship "composition - structure - nonlinear optical property" for aluminate crystals
The relation «composition - structure - property» for a set of more then 160 simple and binary noncentrosymmetric aluminate crystals is considered. These crystals are distributed on the plane of the shortest chemical bond lengths metal-oxygen over an area, covered by a rosette of three ellipses. The distribution of ferroelastic and paraelastic aluminates having measurable level of nonlinear optical susceptibility is different. It is shown that small part of trigonal and monoclinic aluminum-bearing borates and phosphates possess noticeable x(2) level and only three polar crystals related to aluminum iodate family are characterized by pronounced x(2) level.