ダブルペロブスカイト型(Sr, Ba)2(Fe, Mn)(Mo, V)O6の熱電特性

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Sr2FeMo1-xVxO6 (x=0-1.0), Sr2-yBayFeMo0.8V0.2O6 (y=0-1.0) and Sr1.4Ba0.6Fe1-zMnzMo0.8V0.2O6 (z=0-1.0) samples were prepared by using a conventional ceramic method. The crystal structure, bulk density and resistivity of the samples were investigated. The thermoelectric properties of Sr2-yBayFe1-zMnzMo0.8V0.2O6 were examined. In the X-ray diffraction patterns of the samples sintered at 1200°C, the double perovskite phase was confirmed. Sr1.4Ba0.6FeMo0.8V0.2O6 sample had the highest conductivity in Sr2-yBayFe1-zMnzMo0.8V0.2O6 samples. The Seebeck coefficients S of Sr2-yBayFe1-zMnzMo0.8V0.2O6 are negative for 100°C < T < 700°C so that these samples are n-type semiconductors. In particular, the power factor S2σ of Sr2-yBayFe1-zMnzMo0.8V0.2O6 samples increased with increasing Ba and Mn doping up to y=0.6 and z=0.2. The power factor S2σ of Sr1.4Ba0.6Fe0.8Mn0.2Mo0.8V0.2O6 showed the largest value of 83.2 mW/K2m.