Materials Research Bulletin, Vol.34, No.1, 93-101, 1999
Synthesis, crystal and electronic structures, and electrical properties of Rb2Mo12Se14 containing trioctahedral Mo-12 clusters
The synthesis of the new ternary molybdenum chalcogenide Rb2Mo12Se14 is reported. It crystallizes in the trigonal space group with hexagonal lattice parameters a = 9.538 (2) and c = 24.66 (1) Angstrom. The main structural building block of the crystal structure of Rb2Mo12Se14 is the Mo12Se14 cluster unit, which is also found in Cs2Mo12Se14. Electrical resistivity measurements performed on a single crystal indicate that Rb2Mo12Se14 is a metallic conductor with an unusual temperature dependence of its resistivity. Moreover, a superconducting transition was observed at 2.5 K. Extended Huckel tight-binding (EHTB) calculations have been made and are discussed.
Keywords:CS2MO12SE14