Abstract
The effect of substitution for La by Ba on the thermoelectric property of rare earth chalcogenide La3S4 was examined. Cubic γ-phase (Th3P4-type) was obtained in the range of 0≤y≤1 in La3-yBayS4. The lattice parameter (a), electrical resistivity (r) and thermoelectric power (α) of La3-yBayS4 increase with an increase of Ba content y. Power factor α2/r shows a maximum value at y=0.6. It seems that there is the most suitable value of y for the power factor.
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