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[摘要]：La1-xSrxCoO3 is a leading candidate oxide electrode material for replacing standard metal electrodes. Here we investigate the origin of its high electronic conductivity by means of Rietveld analysis, Hall effect measurements, and band-structure calculations. A high electrical conductivity at room temperature, sigma = 4.4 x 10(3) S cm(-1) (which is the largest value for oxides that do not contain noble metals), was achieved by the substitution of 40-50 mol% Sr into the La sites, with a high carrier concentration of 4.5 x 10(21) cm(-3) and a carrier mobility of 5.8 cm(2) V-1 s(-1). The carrier concentration results from a trade-off between hole generation via Sr substitution and electron generation via oxygen deficiency. The high mobility arises from the small effective mass originating in the transition to a higher spin state. |
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