Syntheses, Crystal Structure, and Second Harmonic Generation Response of Four Novel Noncentrosymmetric Tellurites of Quaternary A/M/Te/O (A = Ba, Sr, Ca; M = V, Nb, Ta) System: BaTa 4 Te 3 O 17 , BaNb 4 Te 3 O 17 , SrTa 4 Te 3 O 17 , and CaV 2 TeO 8 .

Four new noncentrosymmetric tellurites of quaternary A/M/Te/O (A = Ba, Sr, Ca; M = V, Nb, Ta) system, namely, BaTa 4 Te 3 O 17 ( 1 ), BaNb 4 Te 3 O 17 ( 2 ), SrTa 4 Te 3 O 17 ( 3 ), and CaV 2 TeO 8 ( 4 ), were synthesized and characterized by single-crystal X-ray diffraction, thermal analysis, diffuse reflectance spectroscopy, and powder second harmonic generation (SHG) response measurements. The isostructural compounds 1-3 crystallize in the P 2 1 2 1 2 1 space group and have a three-dimensional (Ta 4 Te 3 O 17 ) 2- /(Nb 4 Te 3 O 17 ) 2- anionic framework, whereas the layered compound 4 crystallizes in the Ccc 2 space group and has a [V 2 TeO 8 ] 2- anionic layer. The phase-matching compounds 1 , 2, and 3 and the non-phase-matching compound 4 show powder SHG responses equivalent to ∼27, ∼13, ∼24, and ∼68% of that of LiNbO 3 , respectively.