期刊
DALTON TRANSACTIONS
卷 39, 期 4, 页码 1118-1123出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b914712h
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资金
- Agence Nationale pour la Recherche [ANR-JCJC06-1355090]
Polycrystalline samples of R4Sb3 (R = La, Ce, Smand Yb) and Yb4-xR'Sb-x(3)(R' = Sm and La) have been quantitatively synthesized by high-temperature reaction. They crystallize in the anti-Th3P4 structure type (I (4) over bar 3d, no. 220). Structural and chemical characterizations have been performed by X-ray diffraction and electron microscopy with energy dispersive X-ray analysis. Powders have been densified by spark plasma sintering (SPS) at 1300 degrees C under 50 MPa of pressure. Transport property measurements show that these compounds are n-type with low Seebeck coefficient except for Yb4Sb3 that shows a typical metallic behavior with hole conduction. By partially substituting Yb by a trivalent rare earth we successfully improved the thermoelectric figure of merit of Yb4-xR'Sb-x(3) up to 0.75 at 1000 degrees C.
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