Chamoire A, Gascoin F, Estournès C, Caillat T, Tédenac JC. High-temperature transport properties of complex antimonides with anti-Th3P4 structure.
Dalton Trans 2010;
39:1118-23. [PMID:
20066200 DOI:
10.1039/b914712h]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polycrystalline samples of R(4)Sb(3) (R = La, Ce, Sm and Yb) and Yb(4-x)R'(x)Sb(3) (R' = Sm and La) have been quantitatively synthesized by high-temperature reaction. They crystallize in the anti-Th(3)P(4) structure type (I43d, 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 Yb(4)Sb(3) 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 Yb(4-x)R'(x)Sb(3) up to 0.75 at 1000 degrees C.
Collapse