Two new phosphates Pb₃AP₃O₁₂ (A = Sc, Gd), have been synthesized through the high-temperature solution method. They crystallize in the same noncentrosymmetric space group I^‾43d, and feature a three-dimensional A–O (A = Pb_0.75Sc_0.25 or Pb_0.75Gd_0.25) framework with the isolated PO₄ tetrahedra filled in the space of framework. The UV–vis–NIR diffuse reflectance spectra show their band gaps are 4.4 and 4.3 eV, respectively. Interestingly, Pb₃ScP₃O₁₂ exhibits a quite weak second harmonic generation (SHG) responses, less than 0.05 × KH₂PO₄ (KDP), whereas the isomorphic Pb₃GdP₃O₁₂ shows a much larger SHG response, 0.6 × KDP. The relationship between structures and properties indicates that the enhanced SHG response of Pb₃GdP₃O₁₂ originates from the effect of rare-earth on the distortion of [Pb_0.75/Gd_0.25O₆] octahedron.

通过高温溶液法合成了两种新的磷酸盐Pb ₃ AP ₃ O ₁₂（A = Sc，Gd）。它们结晶相同非中心对称空间群我^〜 43 d，并配有三维A-O（A =铅_0.75钪_0.25或Pb _0.75钆_0.25）与分离的PO框架₄填充在框架的空间四面体。紫外可见近红外漫反射光谱显示其带隙分别为4.4和4.3 eV。有趣的是，Pb ₃ ScP ₃ O ₁₂Pb ₃ GdP ₃ O ₁₂表现出相当弱的二次谐波（SHG）响应，小于0.05×KH ₂ PO ₄（KDP），而同构Pb ₃ GdP ₃ O ₁₂显示出更大的SHG响应，即0.6×KDP。结构与性质之间的关系表明，Pb ₃ GdP ₃ O _12的SHG响应增强是由于稀土对[Pb _0.75 / Gd _0.25 O ₆ ]八面体的畸变的影响。