Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, PR China.
J Am Chem Soc. 2011 Dec 14;133(49):20001-7. doi: 10.1021/ja209276a. Epub 2011 Nov 15.
A new series of alkaline-alkaline earth fluoride carbonates (KSrCO(3)F, RbSrCO(3)F, KCaCO(3)F, RbCaCO(3)F, CsCaCO(3)F, and Cs(3)Ba(4)(CO(3))(3)F(5)) were synthesized by spontaneous crystallization with molten fluxes. Their crystal structures, except for Cs(3)Ba(4)(CO(3))(3)F(5), exhibit the stacking of AF (A = K, Rb, Cs) and B(CO(3)) (B = Ca, Sr) layers, and the coplanar alignment of [CO(3)] triangles. The results from the UV-vis diffuse reflectance spectroscopy study of the powder samples indicated that the short-wavelength absorption edges were all below 200 nm, except for Cs(3)Ba(4)(CO(3))(3)F(5), which is about 210 nm. Second-harmonic generation (SHG) on polycrystalline samples was measured using the Kurtz and Perry technique, which indicated that these carbonates are all phase-matchable materials in both visible and the UV region, and their measured SHG coefficients were about 3.33, 3.33, 3.61, 1.11, 1.11, and 1.20 times as large as that of d(36) (KDP), respectively.
一系列新的碱性-碱土氟碳酸盐（KSrCO(3)F、RbSrCO(3)F、KCaCO(3)F、RbCaCO(3)F、CsCaCO(3)F 和 Cs(3)Ba(4)(CO(3))(3)F(5))是通过熔融盐自发结晶合成的。除了 Cs(3)Ba(4)(CO(3))(3)F(5)之外，它们的晶体结构都表现出 AF（A=K、Rb、Cs）和 B(CO(3))（B=Ca、Sr）层的堆叠，以及 [CO(3)]三角形的共面排列。粉末样品的紫外-可见漫反射光谱研究结果表明，除了 Cs(3)Ba(4)(CO(3))(3)F(5)之外，所有样品的短波长吸收边缘都低于 200nm，约为 210nm。使用 Kurtz 和 Perry 技术对多晶样品进行了二次谐波产生（SHG）测量，结果表明这些碳酸盐在可见和紫外区域都是相匹配的材料，其测量的 SHG 系数分别约为 d(36)（KDP）的 3.33、3.33、3.61、1.11、1.11 和 1.20 倍。
