作者:Andreas Leineweber、Herbert Jacobs
DOI:10.1016/s0925-8388(98)00636-7
日期:1998.8
Single crystals of the compound LaAl have been prepared by the reaction of a mixture of lanthanum and aluminium under nitrogen at 950°C. Previously reported crystal structure data determined by X-ray powder diffraction are now confirmed by an X-ray single crystal structure analysis on LaAl: space group Cmcm, Z=8, a=9.455(1) A, b=7.753(1) A, c=5.791(1) A, R1/wR2=2.4/5.6, N(F2≥2σ(I2))=685, N(var.)=16
镧和铝的混合物在氮气下在 950°C 下反应制备了化合物 LaAl 的单晶。先前报道的由 X 射线粉末衍射确定的晶体结构数据现在通过对 LaAl 的 X 射线单晶结构分析得到证实:空间群 Cmcm, Z=8, a=9.455(1) A, b=7.753(1) A , c=5.791(1) A, R1/wR2=2.4/5.6, N(F2≥2σ(I2))=685, N(var.)=16。LaAl 的结构包含由两个晶体学独立的 Al 原子形成的锯齿形链,Al-Al-Al 的交替角为 64° 和 180°。链通过镧原子连接。