Thermoelectric properties of the layered Pd oxide R₂PdO₄ (R = La, Nd, Sm and Gd)

الأصل · EN

We prepared polycrystalline samples of R₂PdO₄ (R = La, Nd, Sm and Gd) using a NaCl-flux technique. The measured resistivity is of the order of 10³-10⁴ Ωcm at room temperature, which is two orders of magnitude smaller than the values reported so far. We further studied the substitution effects of Ce for Nd in Nd₁.₉Ce₀.₁PdO₄, where the substituted Ce decreases the resistivity and the magnitude of the thermopower. The activation energy gap of 70-80 meV and the effective mass of 15 evaluated from the measured data are suitable for thermoelectric materials, but the mobility of 10⁻⁶ cm²/Vs is much lower than a typical value of 1-10 cm²/Vs for other thermoelectric oxides.