Na 11 Ta 8 P 7 O 43 : (Ta 8 O 33 ) bi-capped triangular prisms connected by PO 4 groups resulting in a phase-matched second harmonic response.

Much effort has been devoted to synthesizing nonlinear optical crystals with efficient second harmonic responses. Herein, a tantalum phosphate crystal Na 11 Ta 8 P 7 O 43 with a moderate second harmonic response was obtained using self-fluxes of NaH 2 PO 4 and Na 2 HPO 4 . Na 11 Ta 8 P 7 O 43 belongs to the C c space group of monoclinic systems with cell parameters of a = 8.5710(2) Å, b = 15.1144(4) Å, c = 28.7712(7) Å, β = 92.304(2)°, Z = 4. Its structural features were unique (Ta 8 O 33 ) bi-capped triangular prisms uniformly oriented with a PO 4 connection in the ab plane, which were further joined through additional PO 4 groups in the c direction, resulting in moderate nonlinear effects. In addition, this crystal has the characteristics of phase-matchable second harmonic generation, a shorter cutoff edge than the known materials LiTaO 3 and KTiOPO 4 , and high transmittance from the visible to the near infrared band, and may serve as a potential nonlinear optical crystal.