K2Pb3(CO3)3F2 and KCdCO3F: Novel Fluoride Carbonates with Layered and 3D Framework Structures

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• 作者：Yuan Lin ; Chun-Li Hu ; Jiang-Gao Mao
• 刊名：Inorganic Chemistry
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：54
• 期：21
• 页码：10407-10414
• 全文大小：523K
• ISSN：1520-510X

文摘

Two new mixed metal fluoride carbonates, KCdCO₃F and K₂Pb₃(CO₃)₃F₂, have been synthesized by solvothermal and solid-state techniques. KCdCO₃F crystallizes in the acentric nonpolar space group P6虆m2, and its structure features a three-dimensional anionic framework in which the CdCO₃ layers are further interconnected by bridging F^{鈥?/sup> anions with the negative charge balanced by K+ cations. K₂Pb₃(CO₃)₃F₂ crystallizes in the centrosymmetric space group P6₃/mmc, and its structure exhibits a layered anionic skeleton featuring corner-shared PbO₆F and PbO₆F₂ polyhedra. UV鈥搗is diffuse reflectance spectroscopy studies show that the short-wavelength absorption edges of KCdCO₃F and K₂Pb₃(CO₃)₃F₂ are 227 and 287 nm, respectively. The second harmonic generation (SHG) measurement reveals that KCdCO₃F is a phase-matchable material for generation of doubled-frequency light at both 532 and 266 nm, with a large SHG response of approximately 5.2 times that of KH₂PO₄ (KDP) at 532 nm and a moderate SHG response of approximately 0.75 times that of 尾-BaB₂O₄ (BBO) at 266 nm. Therefore, it is a promising UV material for fourth harmonic generation on a 1064 nm Q-switched Nd:YAG laser.}