Selective and low temperature transition metal intercalation in layered tellurides

Layered materials embrace rich intercalation reactions to accommodate high concentrations of foreign species within their structures, and find many applications spanning from energy storage, ion exchange to secondary batteries. Light alkali metals are generally most easily intercalated due to their light mass, high charge/volume ratio and in many cases strong reducing properties. An evolving area of materials chemistry, however, is to capture metals selectively, which is of technological and environmental significance but rather unexplored. Here we show that the layered telluride T2PTe2 (T=Ti, Zr) displays exclusive insertion of transition metals (for example, Cd, Zn) as opposed to alkali cations, with tetrahedral coordination preference to tellurium. Interestingly, the intercalation reactions proceed in solid state and at surprisingly low temperatures (for example, 80?°C for cadmium in Ti2PTe2). The current method of controlling selectivity provides opportunities in the search for new materials for various applications that used to be possible only in a liquid

THE X-RAY-EMISSION SPECTRA AND ELECTRONIC-STRUCTURE OF THE MISFIT LAYER COMPOUNDS (BIS)1.08NBS2 AND (PBS)1.14TAS2

The x-ray emission lines S Kbeta (3p --> 1s) and S L2,3 (3s --> 2p) have been measured for the misfit layer compounds (BiS)1.08NbS2 and (PbS)1.14TaS2 and the corresponding binary sulphides Bi2S3, NbS2, PbS and TaS2. The x-ray emission data are compared with x-ray photoelectron spectra and band structure calculations of isolated model layers. The experimental data show very clearly the character of the different valence band states, and partial density of states schemes are easily deduced from these data. A comparison with band structure calculations shows a good agreement with the measured spectra

THE X-RAY-EMISSION SPECTRA AND ELECTRONIC-STRUCTURE OF THE MISFIT LAYER COMPOUNDS (BIS)1.08NBS2 AND (PBS)1.14TAS2

The x-ray emission lines S Kbeta (3p --> 1s) and S L2,3 (3s --> 2p) have been measured for the misfit layer compounds (BiS)1.08NbS2 and (PbS)1.14TaS2 and the corresponding binary sulphides Bi2S3, NbS2, PbS and TaS2. The x-ray emission data are compared with x-ray photoelectron spectra and band structure calculations of isolated model layers. The experimental data show very clearly the character of the different valence band states, and partial density of states schemes are easily deduced from these data. A comparison with band structure calculations shows a good agreement with the measured spectra