论文部分内容阅读
K_6CrNb_(15)O_(42)crystallizes in the hexagonal system with a=9.126(3)A,c=12.068(3)A,V=870.4(5)A~3,and space group P6_2/mcm,Z=1.The structure was solved using direct method andFourier Techniques.Of the 829 unique reflections measured by counter techniques,448 with I≥3σ(I)were used in the least-squares refinement of the model to R=0.034(R_w=0.044).The structureof KoCrNb_(15)O_(42)may be described as consisting of corner-shared and edge-shared octahedra,the ringunits composed of six octahedra of Nb(1)are corner-shared one another along the c-axis to formhexagonal column octahedra chains which are connected by K~+ and octahedra of Nb(2).
K_6CrNb_ (15) O_ (42) crystallizes in the hexagonal system with a = 9.126 (3) A, c = 12.068 (3) A, V = 870.4 (5) A ~ 3, and space group P6_2 / The structure was solved using direct method and Fourier techniques. Of the 829 unique reflections by counter techniques, 448 with I ≥ 3σ (I) were used in the least-squares refinement of the model to R = 0.034 (R_w = 0.044). The structure of KoCrNb_ (15) O_ (42) may be described as consisting of corner-shared and edge-shared octahedra, the ringunits composed of six octahedra of Nb (1) are corner-shared one another along the c-axis to form hexagonal column octahedra chains which are connected by K ~ + and octahedra of Nb (2).