Metallike behavior of lithium intercalated in molybdenum cluster chalcogenides

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00034a020· OSTI ID:5224408

Prigge, C; Mueller-Warmuth, W ^[1]; Gocke, E; Scheollhorn, R ^[2]

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1. Universitaet Muenster (Germany)
2. Universitaet Berlin (Germany)

Binary and ternary molybdenum cluster chalcogenides are of interest as superconductors. [sup 7]Li solid-state NMR studies have been carried out on the molybdenum cluster chalcogenides ( Chevrel phases') Li[sub 3]Mo[sub 6]X[sub 8], Li[sub 3.8]Mo[sub 6]X[sub 8], and Li[sub 4]Mo[sub 6]X[sub 8] at 16 and 117 MHz and various temperatures. The low-temperature spectra of Li[sub 3]Mo[sub 6]X[sub 8], Li[sub 3.8]Mo[sub 6]X[sub 8], and Li[sub 4]Mo[sub 6]x[sub 8] can be interpreted in terms of chemical shift (CS), nuclear quadrupole (Q), and dipole-diple (D) interaction, where the principal axes of the CS and Q tensors do not coincide. The spin-lattice relaxation of these compounds is governed by contributions from the lithium diffusion and from the interaction with conduction electrons. The latter part is connected with the isotropic (Knight) shift by a Korrienga relation. The formation of lithium triclusters with partial charge transfer to the host lattice, short Li-Li distances and remaining electron density in the 2s orbitals is concluded from the various data. In Li[sub 4]Mo[sub 6]X[sub 8] by contrast, the intercalated lithium is completely ionized. Models for structure and motion have been developed in connection with recent neutron diffraction studies. 12 refs., 8 figs., 2 tabs.

• OSTI ID: 5224408
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:10; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL ISOTOPES
ALKALI METALS
CHALCOGENIDES
ELEMENTS
ISOTOPES
LIGHT NUCLEI
LITHIUM
LITHIUM 7
LITHIUM ISOTOPES
MAGNETIC RESONANCE
METALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM SELENIDES
MOLYBDENUM SULFIDES
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
REFRACTORY METAL COMPOUNDS
RESONANCE
SELENIDES
SELENIUM COMPOUNDS
STABLE ISOTOPES
STOICHIOMETRY
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS