Abstract
Abstract This paper consists of three parts. In the first section a review is given of the structures and some properties of the dichalcogenides of titanium, vanadium and chromium. The second section deals with the results of thermal expansion studies of these dichalcogenides. A thermodynamic discussion of the thermal expansion in uniaxial crystals is given. The thermal expansion of these compounds, except TiS 2 , is anomalous, the expansion in the plane perpendicular to the unique axis is larger than along the unique axis. This anomalous behaviour is ascribed to the strong repulsion between the 3d electrons. In section 3 the structures and physical properties of the intercalates of the 3d transition metal dichalcogenides are discussed. New results are given for nonstoichiometric chromium intercalates. These compounds show semiconducting behaviour and have localized magnetic moments. The localization of the d electrons in the alkali metal intercalates increases in the series Ti, V, Cr. Chromium compounds always show localized behaviour while the vanadium compounds occur in two forms with resp. localized behaviour for the stoichiometric compounds and delocalized behaviour for the alkali-metal poor compounds.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physica B+C
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
