First experimental evidence of potassium ordering in layered K4Co7O14

被引：31
作者：
Blangero, M
Decourt, R
Carlier, D
Ceder, G
Pollet, M
Doumerc, JP
Darriet, J
Delmas, C
机构：
[1] CNRS, Inst Chim Mat Condensee Bordeaux, F-33608 Pessac, France
[2] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
来源：
INORGANIC CHEMISTRY | 2005年 / 44卷 / 25期
关键词：
D O I：
10.1021/ic0514804
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The layered P2-K4CO7O14 oxide has been prepared and characterized by means of X-ray diffraction, electrical conductivity, thermopower, and magnetic measurements. The crystal structure of K4Co7O14 (P6(3)/m space group, Z = 2, a = 7.5171 (1) angstrom, and c = 12.371 (1) angstrom) consists of a stacking of slabs of edge-shared CoO6 octahedra with K+ ions occupying ordered positions in the interslab space, leading to a a(0)root 7 x a0 root 7 supercell. Potential energy calculations at 0 K are in good agreement with the ordered distribution of potassium ions in the (ab) plane. This oxide is metallic, and the magnetic susceptibility is of Pauli-type, which contrasts with the Curie-Weiss behavior of the homologous NaxCoO2 (x approximate to 0.6) oxide with close alkali content. The thermopower at room temperature is about one-third that of polycrystalline Na0.6CoO2.
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页码：9299 / 9304
页数：6
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