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Erschienen in:
01.12.2012
Preparation and thermoelectric properties of BaMn2−xZnxSb2 zintl compounds
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 12/2012
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Abstract
Zn doped BaMn2Sb2 single crystals were synthesized by a Sn-flux method using nominal compositions of BaMn2−xZnxSb2 (x = 0.0, 0.3, 0.5, 0.7, and 1.0). The products were characterized by powder X-ray diffraction and scanning electron microscopy equipped with electron energy dispersive spectroscopy, respectively. A pure phase of BaMn2Sb2 for x = 0, a mixture of Zn doped BaMn2Sb2 and Sn for x = 0.3–0.7, and a mixture of Zn doped BaMn2Sb2, Sn and ZnSb for x = 1 were obtained. The electrical conductivity and Seebeck coefficient of the crystals from room temperature to 773 K were measured. The electrical conductivity of all the crystals increased with increasing temperature, while the Seebeck coefficient decreased with increasing temperature and approached negative values at high temperatures. The Zn doped BaMn2Sb2 crystals showed significantly higher Seebeck coefficient at low temperatures (T < 550 K) and lower electrical conductivity at higher temperatures (T > 550 K) than the BaMn2Sb2 single crystal.