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0.3 Mo 5 RuSe 8 .-The new Chevrel phase is prepared by Cu-deintercalation of CuMo5RuSe8 (reaction with I2 in MeCN) followed by reaction with Ti powder (1100°C, evacuated silica tube, 48 h). Ti0.3Mo5RuSe8 is characterized by powder XRD (rhombohedral, space group R3, Z = 3) and high-temperature thermoelectric measurements. The structure of the unfilled phase Mo 5 RuSe 8 (R3, Z = 3) is also refined from powder XRD data. The thermoelectric properties of the new Chevrel phase are compared to previously reported data for related Chevrel phases. Ti0.3Mo5RuSe8 behaves like a heavily doped semiconductor with an estimated band gap of 0.16 eV. Although its high temperature thermoelectric properties are not as good as those of the best Chevrel phase (Cu3.1Mo6Se8), the results demonstrate how a combination of both filling and cluster core substitutions can lead to improved thermoelectric materials. -(MCGUIRE, M. A.; SCHMIDT, A. M.; GASCOIN, F.; SNYDER, G.