THERMOELECTRIC STUDY on POLYCRYSTALLINE La{sub}(1-x)Sr{sub}xRuO{sub}3

摘要

The polycrystalline samples of the orthorhombic perovskite La{sub}(1-x)Sr{sub}xRuO{sub}3 (0.1≤x≤0.9) have been prepared by conventional solid state chemistry reactions. The phase constituents, composition homogeneity and micro-morphology were measured by X-ray powder diffraction, Energy Disperse X-ray spectroscopy and scanning electron microscopy. Subsequently, the materials were then characterized by means of the electrical resistivity, thermal conductivity and thermopower measurements. In particular, the temperature and composition dependence of thermopower was approached in light of the spin-entropy model proposed by W. Koshibae et al. for the strongly correlated system, Na{sub}xCoO{sub}4.