Quaternary rare earth transition metal arsenide oxides RTAsO (T=Fe, Ru, Co) with ZrCuSiAs type structure
作者:P Quebe、L.J Terbüchte、W Jeitschko
DOI:10.1016/s0925-8388(99)00802-6
日期:2000.4
the tetragonal ZrCuSiAs type structure, which was refined from single-crystal X-ray diffractometer data of PrFeAsO: P 4/ nmm , Z =2, a =398.5(1) pm, c =859.5(3) pm, R =0.058 for 167 structure factors and 12 variable parameters. All atomic positions are fully occupied. Chemical bonding in PrFeAsO can be rationalized with oxidation numbers corresponding to the formula Pr +3 Fe +2 As −3 O −2 . An electron
摘要 等原子四元化合物 R FeAsO ( R =La–Nd, Sm, Gd), R RuAsO ( R =La–Nd, Sm, Gd–Dy) 和 R CoAsO ( R =La–Nd) 以四方 ZrCuSiAs 型结晶结构,由 PrFeAsO 的单晶 X 射线衍射仪数据精修:P 4/ nmm , Z = 2, a =398.5(1) pm, c =859.5(3) pm, R =0.058 167 个结构因子和12 个可变参数。所有原子位置都被完全占据。PrFeAsO 中的化学键合可以通过对应于公式 Pr +3 Fe +2 As -3 O -2 的氧化数来合理化。只有在将 281.8 pm 的 Fe-Fe 相互作用视为键合时,铁原子的电子数才能达到 18。