摘要
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 and Fourier 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 structure of KoCrNb_(15)O_(42)may be described as consisting of corner-shared and edge-shared octahedra,the ring units 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).
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 and Fourier 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 structure of KoCrNb_(15)O_(42)may be described as consisting of corner-shared and edge-shared octahedra,the ring units 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).
