Acta Crystallographica

A. Oberlin

<i>Electron microscopy of thin crystals</i>by P. B. Hirsch, A. Howie, R. B. Nicholson, D. W. Pashley and M. J. Whelan

《薄晶体的电子显微镜观察》作者：P. B. 赫希、A. 霍伊、R. B. 尼科尔森、D. W. 帕什利和M. J. 惠兰

The structures of K3Sb5O14 and K2Sb4O11 have been solved by the single-crystal X-ray direct method and the heavy-atom method, respectively. The structure of K3Sb5O14 is orthorhombic, with space group Pbam and cell parameters a = 24.247 (4), b = 7.157 (2), c = 7.334 (2) A, Z = 4. The structure of K2Sb4O11 is monoclinic, with space group C2/m and cell parameters a = 19.473 (4), b = 7.542 (1), c = 7.198 (1) A, beta = 94.82 (2) deg, Z = 4. A full-matrix least-squares refinement gave R = 0.072 and R = 0.067, respectively. In both structures, oxygen atoms form an octahedron around each Sb atom and an irregular polyhedron around each K atom. By sharing corners and edges, the octahedra form a skeleton network having intersecting b-axis and c-axis tunnels. The K(+) ions, which have more than ten oxygen near neighbors, are located in these tunnels. Evidence for K(+)-ion transport within and between tunnels comes from ion exchange of the alkali ions in molten salts and anisotropic temperature factors that are anomalously large in the direction of the tunnels.

H. Y.-P. Hong

The two-dimensional tunnel structures of K3Sb5O14 and K2Sb4O11

K3Sb5O14和K2Sb4O11的二维隧道结构

The difference electron density has been evaluated for potassium tetrachloropalladate, K2PdC14, using synchrotron radiation at 0.7 and 0 . 9 ~ at room temperature. A similar data set was measured with Mo Ka radiation. The Ap maps for the synchrotron data sets are consistent, and agree approximately with the Mo Ka map away from the Pd nucleus. There is marked depletion of electrons near the Pd core, and substantial movement of electron density near the structural cavities. The Pd-atom charge is approximately + 2, but the K-atom charge is significantly negative. These charges result from transfer of electron density from tightly packed to more open regions of the structure, and do not necessarily reflect atomic electronegativities. K2PdCI4, P4/mmm, Z = 1, /z0.7 = 4.1784, /Zo.9 = 8.6075 m m i, F(000) = 152, T= 293 K, Mr=326.4, a=7.0750(5) , c = 4.1158 (5) ~, V = 206.02 (4) .~3, D,. = 2.631 Mg m-3

J.R. Hester

E.N. Maslen

Nick Spadaccini

N. Ishizawa

Y. Satow

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation

出版信息	出版商: Wiley-Blackwell Publishing Ltd，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 1981，原创研究文献占比: ，自引率:， Gold OA占比:

Acta Crystallographica

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Electron microscopy of thin crystalsby P. B. Hirsch, A. Howie, R. B. Nicholson, D. W. Pashley and M. J. Whelan

The two-dimensional tunnel structures of K3Sb5O14 and K2Sb4O11

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation

Diffuse Röntgenreflexe und Ordnungsübergang beim Schmelzpunkt

The two-dimensional tunnel structures of K3Sb5O14 and K2Sb4O11

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation

Electron Density in Potassium Tetrachloropalladate (K2PdCl4) From Synchrotron Radiation