Syntheses, Crystal Structure, and Second Harmonic Generation Response of Noncentrosymmetric Layered Selenites and Tellurites of Antimony(V), ASb3X2O12 (A = K, Rb, Cs, Tl; X = Se, Te)

Eightquaternary selenites and tellurites of antimony-(V), ASb(3)X(2)O(12) (A = K, Rb, Cs, Tl; X = Se, Te),have been synthesized by solid state reactions and structurally characterizedby single crystal X-ray diffraction. They are isostructural compounds,which crystallize in the polar noncentrosymmetric P6(3) mc space group with hexagonal unitcell parameter values in the ranges of a = 7.1538(1)-7.2429(1)& ANGS; and c = 11.8978(4)-12.0478(3) & ANGS;.Their noncentrosymmetric layered structure consists of hexagonal-tungsten-oxide-related(Sb3X2O12)(-) layersinterleaved with A(+) ions. They have optical band gap valuesof 2.90-4.46 eV and showed powder second harmonic generationresponse equivalent to 1.0-37.2 x KDP. Eight isostructural ASb(3)X(2)O(12) (A = K, Rb, Cs, Tl; X = Se, Te) compounds ofantimony-(V) were synthesizedand structurally characterized by single crystal X-ray diffraction.They have hexagonal-tungsten-oxide (HTO)-related noncentrosymmetriclayered structures and showed powder second harmonic generation (SHG)response. TlSb3Te2O12 compound showedsignificantly high SHG response of 37.2 x KDP.

Automated summary

Eight isostructural ASb(3)X(2)O(12) (A = K, Rb, Cs, Tl; X = Se, Te) compounds of antimony-(V) were synthesized and structurally characterized by single crystal X-ray diffraction. They have hexagonal-tungsten-oxide (HTO)-related noncentrosymmetric layered structures and showed powder second harmonic generation (SHG) response. TlSb3Te2O12 compound showed significantly high SHG response of 37.2 x KDP.