Semimetallic behaviour

These results are consistent with the electronic properties of CNTs probed by magnetic measurements. In sum, most of MWCNTs show semimetallic behaviour experimentally. 

Similar alloys have been investigated theoretically more and more in the last years LiSi [9], CsPb [10], MgBi [11]. Such previous investigations on the conductivity of alloys were based on simulation data for only one composition. We analyze, for the first time, by means of computer simulation, the strong variation of the conductivity with concentration - ranging from metallic to semimetallic behaviour. 

Actinide chalcogenides can be obtained for instance by reaction of the elements, and thermal stability decreases S > Se > Te. Those of a given actinide differ from those of another in much the same way as do the oxides. Nonstoichiometry is again prevalent and, where the actinide appears to have an uncharacteristically low oxidation state, semimetallic behaviour is usually observed. 

In comparison with aluminium and gallium, the germanium ternary compounds exhibit semimetallic behaviours, and the tin phases are rather metalhc ones. 

The second group is characterized by a smaller number of ternary compounds, which may be explained by the similarity of the crystallochemical behaviours of the two components Be, Mg, Ga or Ge, and Al. As one can see, scandium generally forms a small number of compounds in the investigated systems (Sc is rather similar with a 3d transition metal, than with the other rare earths). All of the ternary compounds with solved crystal structures are characterized by structure types of the binary compounds or closely related ones. Systems with Ge and Al show the La202S type of crystal structure. This may be explained by the partially semimetallic properties of Al in these systems. 

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