SZAJWAJ, Olivier; GAUDIN, Etienne; WEILL, François; DARRIET, Jacques; DELMAS, Claude

doi:10.1021/ic9008653

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SZAJWAJ, Olivier
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GAUDIN, Etienne
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

WEILL, François
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
Centre de Ressources en Microscopie Electronique et Microanalyse [CREMEN]

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Inorganic Chemistry. 2009, vol. 48, n° 19, p. 9147-9154

American Chemical Society

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A new layered phase Na0.60VO2 was synthesized by chemical deintercalation of sodium from the pristine compound O3-NaVO2. The Na0.60VO2 compound exhibits a distorted P′3-type oxygen stacking (AABBCC) with an average monoclinic unit cell containing a = 4.9862(14) Å, b = 2.8708(8) Å, c = 5.917(2) Å, and β = 104.36(3)°. A modulated structure was observed by transmission electron microscopy and X-ray diffraction (XRD) measurements. Indexation of the XRD pattern was achieved by using the q vector equal to 0.44b*, and the 4D superspace group C2/m (0 β 0) s0 was then deduced. The specific heat measurement showed a strong correlated system with a γ value of around 20 mJ·mol−1·K−2. The electrical conductivity shows a semiconductor-like behavior with an activation energy of 0.52 eV. A paramagnetic behavior of the susceptibility is observed below room temperature with a Curie constant equal to C = 0.076 emu·K−1·mol−1·Oe−1. To explain this small value, a model of pseudotriangular clusters of vanadium with a random distribution of V3+ and V4+ was considered.< Réduire

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Investigation of the new P′3-Na<sub>0.60</sub>VO<sub>2</sub> phase: structural and physical properties

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