【摘要】 用Phillips PW-1100型单晶四圆衍射仪收集五磷酸铽晶体的三维强度数据.应用重原子法测定了晶体结构.在四圆衍射仪上测得晶胞参数:α=8.721（3）A,b=8.877（2）A,c=12.911（1）A,β=90.52（2）°,Z=4.空间群为C_2h⁵-P2₁/c.原子坐标参数、标度因子参数及所有原子的各向异性温度因子参数一起进行全矩阵及方块矩阵最小二乘修正,最后R因子为0.075,R_ω=0.079.晶体结构分析结果表明,结构系由阳离子连结阴离子带构成络合物.由氧原子构成阳离子的八配位稍歪扭的正方反棱柱体.Tb-Tb最短距离为5.904A.更多还原

【Abstract】 The crystal structure of the compound terbium pentaphosphate has been determined from three dimensional intensities measured with an automatic Phillips PW-1100 single crystal diffractometer. The structure was solved by heavy-atom method. It has a monoclinic unit cell with a= 8.721（3）, 6=8.877（2）, c=12.911（1） A, β=90.52（2）° and Z=4. The space group is C_2h⁵-P2₁/c. The positional and scale parameters with anisotropic temperature factors for the atoms were refined by fullmatrix and block-diagonal least squares calculations to a final R=0.075 and R_w=0.079. The result of structural analysis establishes that the structure is built up with discrete anionio ribbons linked by the cations in a complex way. The coordination of the cation by oxygen atoms is eight-fold with the geometry of a slightly distorted square antiprism. Tb-Tb distance is 5.904 A.更多还原