BLANGERO, Maxime; DECOURT, Rodolphe; CARLIER-LARREGARAY, Dany; CEDER, Gerbrand; POLLET, Michaël; DOUMERC, Jean-Pierre; DARRIET, Jacques; DELMAS, Claude

doi:10.1021/ic0514804

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BLANGERO, Maxime
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DECOURT, Rodolphe
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CARLIER-LARREGARAY, Dany
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Inorganic Chemistry. 2005, vol. 44, n° 25, p. 9299-9304

American Chemical Society

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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 (P63/m space group, Z = 2, a = 7.5171(1) Å, and c = 12.371(1) Å) consists of a stacking of slabs of edge-shared CoO6 octahedra with K+ ions occupying ordered positions in the interslab space, leading to a a0V7×a0V7 supercell. Potential energy calculations at 0 K are ivn 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~0.6) oxide with close alkali content...< Leer menos

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Thermoelectric power

NaxCoO2

Bronzes

NaCo2O4

Sodium

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First experimental evidence of potassium ordering in layered K4Co7O14

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