Hydrogen intercalates of low-dimensional dichalcogenides of transition metals

Temperature dependences of electrical conductivity and magnetic susceptibility of intercalates H x NbSe 2 (0 ⩽ x ⩽ 5.2) and D x NbSe 2 (0 ⩽ x ⩽ 0.53) have been studied. A change of the metallic type of conductivity for the semiconducting one for H x NbSe 2 ( x > 1) is related to the structural tr...

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Bibliographic Details
Published in:	International journal of hydrogen energy Vol. 22; no. 2; pp. 233 - 239
Main Authors:	Makara, V.A., Babich, N.G., Zakharenko, N.I., Pasechny, V.A., Rudenko, O.V., Surzhko, V.F., Kulikov, L.M., Semenov-Kobzar, A.A., Antonova, M.M., Chekhovsky, A.A., Askel-Rud, L.G., Romaka, L.P.
Format:	Journal Article Conference Proceeding
Language:	English
Published:	Oxford Elsevier Ltd 01-02-1997 Elsevier
Subjects:	Condensed matter: electronic structure, electrical, magnetic, and optical properties Conductivity of specific materials Electronic transport in condensed matter Exact sciences and technology Magnetic properties and materials Magnetically ordered materials: other intrinsic properties Other crystalline inorganic semiconductors Physics Saturation moments and magnetic susceptibilities Quantity ratio Micellar catalysis Transition metal compounds Niobium selenides Hydrogen additions Intercalation compounds Experimental study Electric conductivity Magnetic susceptibility
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Summary:	Temperature dependences of electrical conductivity and magnetic susceptibility of intercalates H x NbSe 2 (0 ⩽ x ⩽ 5.2) and D x NbSe 2 (0 ⩽ x ⩽ 0.53) have been studied. A change of the metallic type of conductivity for the semiconducting one for H x NbSe 2 ( x > 1) is related to the structural transition of the 2HTaS 2 → 2HMoS 2 type. D x NbSe 2 (with the exception of x = 0.41) has a metallic type of conductivity. H x NbSe 2, D x NbSe 2 are paramagnets. Their magnetic susceptibility at small contents of hydrogen (deuterium) depends weakly on the temperature. At x > 1 the magnetic susceptibility of intercalates changes according to the Curie-Weiss law. The 2HNbSe 2 treatment with the hydrogen plasma leads to the formation of the H x NbSe 2 intercalates with the 2HTaS 2 and 2HMoS 2 structural type. The temperature rise results in the formation of only 2HTaS 2 structural type. Hydrogen intercalates in considerable quantities in 2HWSe 2 and 2HMoSe 2 (H x WSe 2:0 < x < 3.9; H x MoSe 2:0 < x < 2.08) with the dominating intercalation of hydrogen on cooling. 2H-WSe 2 possesses improved sorption properties as compared to 2HMoSe 2. Hydrogen intercalates of layered dichalcogenides of d-transition metals are promising as new hydrogen-containing materials applied for different purposes.
ISSN:	0360-3199 1879-3487
DOI:	10.1016/S0360-3199(96)00159-0