Na₁₁Ta₈P₇O₄₃: (Ta₈O₃₃) bi-capped triangular prisms connected by PO₄ 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 Na11Ta8P7O43 with a moderate second harmonic response was obtained using self -fluxes of NaH2PO4 and Na2HPO4. Na11Ta8P7O43 belongs to the Cc space group of monoclinic systems with cell parameters of a = 8.5710(2) & Aring;, b = 15.1144(4) & Aring;, c = 28.7712 (7) & Aring;, beta = 92.304(2)degrees, Z = 4. Its structural features were unique (Ta8O33) bi-capped triangular prisms uniformly oriented with a PO4 connection in the ab plane, which were further joined through additional PO4 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 LiTaO3 and KTiOPO4, and high transmittance from the visible to the near infrared band, and may serve as a potential nonlinear optical crystal.