Abstract
BaMn 2Sb 2 single crystals, synthesized by a Sn-flux method, were characterized by powder X-ray diffraction and scanning electron microscopy equipped with electron energy dispersive spectroscopy, respectively. The single crystals were determined to have the body-centered tetragonal ThCr 2Si 2 crystal structures with space group I4/ mmm. Their thermoelectric properties from room temperature to ∼773 K were also investigated. The electrical conductivity of the crystals is very low at room temperature. And it increases slowly and rapidly with temperature as the temperature is below and above ∼600 K, respectively. The Seebeck coefficient of the crystals is ∼225 μV/K at room temperature. And it decreases quickly and gradually below and above ∼600 K, respectively and tends to be negative at ∼773 K. The material has poor thermoelectric properties when the temperature is below 773 K.
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