Highly polarized [GeOTe ₃ ] motif-driven structural order promotion and an enhanced second harmonic generation response in the new nonlinear optical oxytelluride Ba ₃ Ge ₂ O ₄ Te ₃

A new NLO-active oxytelluride, Ba 3 Ge 2 O 4 Te 3 , was successfully synthesized by using Ba 2 ZnGe 2 O 7 as a parent model. Both experiments and theoretical calculations show that Ba 3 Ge 2 O 4 Te 3 is a promising NLO material with well-balanced properties.