A highly thermostable carbonatoperoxovanadate, Cs 3 VO(O 2 ) 2 CO 3 , exhibits a remarkably strong SHG response of approximately 23.0 times that of KDP, which is the largest among those of the reported NLO carbonate materials.
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.