Effect of impurities on thermoelectric power in thallium blue bronze Tl0.3MoO3

Abstract Temperature dependence of thermoelectric power of thallium blue bronze Tl 0.3 MoO 3 doped with K and W atoms impurities are presented. The experimental results display that thermoelectric power data for all the doped samples can be fitted to an expression of the type, S = At + B / T , below and above T p . With the addition of impurities, the absolute values of the thermoelectric power decrease and the temperature of the sign change of thermoelectric power T s increases. The mechanisms of drift diffusion and phonon drag of the thermoelectric power are involved. The donor effect of the impurities and the influence of weak inter-chain coupling are proposed.