Intercalation of the layer type transition metal dichalcogenides by a variety of organic molecules, alkali metals, or ‘3d’ transition metals, provides a powerful way to finely tune the electron occupation of the relatively narrow ‘d’ bands met in these solids These transition metal dichalcogenides are highly anisotropic solids, sometimes referred to as ‘two-dimensional’ solids, and the intercalant molecules which are electron donors enter between the layers This can result in profound changes in the electronic properties of the host lattice, and these changes can be understood in terms of charge transfer and increased interlayer separation The phenomena discussed include optical properties, transport properties, super-conductivity, order-disorder phenomena and phase changes, staging, magnetic properties, metal-insulator transitions, Anderson localization, and fast-ion conduction Some possible practical applications are also considered

Electronic properties of intercalation complexes of the transition metal dichalcogenides

Structural and electrochemical properties of the proton / γ-MnO2 system

Selenium-77 nuclear magnetic resonance spectroscopy

Single crystals of PbWO 4 at room temperature show a narrow excitation peak around 325 nm with the FWHM as small as 10 nm and a broad emission peak around 420–440 nm. The light output is about 4.4% of that in BGO. The luminescence is fast with the decay constant less than 10 ns for 84% and as fast as 40 ns for the rest. Degradation in optical transmittance due to γ-ray irradiation is not large up to at least 10 7 rad in the present crystals which are slightly coloured yellow. Spontaneous recovery of the radiation damage occurs to some extent with a time constant much shorter than 18 days. The above result indicates a possibility that this material may be resistive enough against radiation if colourless crystals could be grown.

Scintillation characteristics of PbWO4 single crystals at room temperature

Lithium batteries: a new tool in solid state chemistry

Semiconductor-metal transition upon intercalation in LixZrSe2

The Na-TiS2 system: A critical discussion of the phase boundaries, structural and NMR studies

Dependence of the physical properties of pure and lithium intercalated zirconium diselenide on the host lattice stoichiometry

LixZrS2 intercalation compounds

Les conducteurs ioniques NaxYxZr1−xS2

L. Trichet

Papers

Semiconductor-metal transition upon intercalation in LixZrSe2

The Na-TiS2 system: A critical discussion of the phase boundaries, structural and NMR studies

Dependence of the physical properties of pure and lithium intercalated zirconium diselenide on the host lattice stoichiometry

LixZrS2 intercalation compounds

Les conducteurs ioniques NaxYxZr1−xS2