氟化镱是一种无色透明立方结晶或白色粉末。它溶于盐酸、硝酸、氢氟酸和氯化铵溶液,微溶于水。
目前,氟化物光学玻璃材料的需求逐年增长,主要应用于光纤通讯、医学等领域。氟化物光学玻璃主要由碱土金属氟化物和稀土氟化物组成。将氟化镱加入到氟化物玻璃中,能使其具有优良的近红外性能和特殊的光学性能。
应用氟化镱由于其发光特性,可用作多种光学材料,如光纤掺杂、激光晶体、单晶原料、激光放大器等,以及用于氟化玻璃的制备与研究。
制备 第一步:合成氟化镱将第一步制备好的氟化镱沉淀物与去离子水搅拌均匀,形成含固量为40%的糊状物,并升温至105℃保温2.5小时以去除二氧化碳。若未能彻底清除,则最终产品的纯度会受到影响。
在保温过程中需定期测试反应物pH值,如pH不在1~1.5之间时可通过添加35%高纯氢氟酸来调整。
第三步:焙烧氟化镱将经过第二步处理后的氟化镱送入板框压滤机进行洗涤,直至氯离子和硫酸根离子含量均低于20ppm后,压干并取出。然后将其装入陶瓷坩埚中,在梯度升温下焙烧以获得最终产品。
该氟化镱主要用于制备和研究用于光学领域的氟化玻璃。
YF[SeO3]-type rare-earth metal(III) fluoride oxoselenates(IV) MF[SeO3] (M = Y, Ho-Lu) crystallize monoclinically in space group P21/c (no. 14) with Z = 4. Obeying the lanthanoid contraction, the lattice parameters decrease successively from a = 657.65(7), b = 689.71(7), c = 717.28(7) pm and β = 99.036(5)° for YF[SeO3] at 298 K to a = 648.39(6), b = 681.28(7), c = 705.81(7) pm and β = 98.657(5)° for LuF[SeO3] at 100 K (LT-LuF[SeO3], LT ≡ Low Temperature). The M3+ cations are occupying the general site 4e. Contrary to the triclinic structure of RT-LuF[SeO3] (RT ≡ Room Temperature; CN(Lu3+) = 7) the higher coordination number eight is achieved for the M3+ cations in all YF[SeO3]-type compounds. This results in [MO6F2]11− polyhedra (d(M-O) = 228 - 243/225 - 239 plus 263/258 pm, d(M-F) = 219/216 pm, M = Y/Lu), which are connected via common O・ ・ ・O edges to form infinite chains 1 ∞[MOe 4/2Ot 2/1Ft 2/1]7−} (e ≡ edge-sharing, t ≡ terminal) running along [010]. Neighboring chains share common O3・ ・ ・O3 and O3・ ・ ・F edges generating 2 ∞[M(O3)3/3(O2)2/2(O1)1/1F2/2]4−} sheets parallel to the (100) plane. Finally, these 2 ∞[MO3F]4−} sheets are interconnected by Se4+ cations, which appear in isolated ψ1-tetrahedral [SeO3]2− anions (d(Se-O) = 167 - 175 pm). For the synthesis of the YF[SeO3]-type rare-earth metal(III) fluoride oxoselenates( IV) MF[SeO3] (M = Y, Ho-Lu), the rare-earth metal sesquioxides (M2O3) and trifluorides (MF3), and selenium dioxide (SeO2) in molar ratios of 1 : 1 : 3 with the fluxing agent CsBr were reacted within five days at 700 - 750 °C in evacuated graphitized silica ampoules.