Abstract
The thermoelectric power and electrical resistivity of cluster-type compounds Re 6Se 8Te 7 and Re 6Te 15 have been measured over the temperature range 90–420 K. Samples were prepared by reacting elemental powders at 1150 K in a closed system for 170 h. X-ray analysis revealed orthorhombic and tetragonal lattices for Re 6Te 15 and Re 6Se 8Te 7, respectively. The lattice parameters and unit cell volume decrease from Re 6Te 15 to Re 6Se 8Te 7. Measurements indicate p-type semiconducting behavior for both Re 6Te 15 and Re 6Se 8Te 7. Electrical resistivity data suggest hopping conduction below 220 K for Re 6Te 15 and 190 K for Re 6Se 8Te 7. The presence of the energy gap is observed in both compounds at higher temperatures. The thermoelectric power of Re 6Te 15 initially increases with temperature and reaches a peak value at 340 K. The thermoelectric power of Re 6Se 8Te 7 increases sharply as temperature increases and then levels off above 260 K. Analysis of the power factors indicates that selenium substitution in Re 6Te 15 leads to a material with better thermoelectric properties above 320 K.
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