Phase matching achieved by isomorphous substitution in IR nonlinear optical material Ba2SnSSi2O7with an undiscovered [SnO4S] functional motif

A new paradigm for designing high-performance PM NLO crystals: a novel PM fresnoite oxychalcogenide, Ba 2 SnSSi 2 O 7 , has been successfully designed and obtained by the isomorphous substitution strategy, on the basis of the NPM parent Ba 2 TiOSi 2 O 7 .