Single crystals of CsBi2Ti2TaO10 (I) are prepared by solid state reaction of Cs2CO3, Bi2O3, TiO2, and Ta2O5 (Pt crucible, 1000 °C, 24 h, 30% yield).

The remarkably large SHG efficiency of KCdCO3F originates from enhancement via interatomic interactions between the s and p states of Cd2+ and the π-conjugated groups of the [CO3]2− unit.

Solid solutions of noncentrosymmetric Dion–Jacobson phases, CsBi1-xEuxNb2O7, have been synthesized. Second harmonic generation and photoluminescence properties of the materials are reported.