Abstract
The new Chevrel phase Ti 0.3Mo 5RuSe 8 has been synthesized and characterized by quantitative microprobe analysis, powder X-ray diffraction, and high-temperature thermoelectric properties measurements. The thermoelectric properties of this compound are compared to the previously reported data for other related Chevrel phases. We report also the results of Rietveld analysis of powder X-ray diffraction data for Ti 0.3Mo 5RuSe 8. This compound adopts the rhombohedral Chevrel phase structure (space group R 3 ¯ , Z=3) with hexagonal lattice constants a=9.75430(25) Å and c=10.79064(40) Å. The low level of incorporation and low scattering power of Ti precluded the identification of the Ti positions, and Rietveld refinement was carried out only for the Mo 5RuSe 8 framework of Ti 0.3Mo 5RuSe 8 ( R p=10.5%, R wp=14.6%). Rietveld analysis was also used to refine the structure of the unfilled phase Mo 5RuSe 8 ( R 3 ¯ , Z=3, a=9.63994(8) Å, c=10.97191(11) Å, R p=8.0%, R wp=10.5%). Comparisons between the two structures are made.
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