RT Journal Article
T1 Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure
A1 Serrano Sánchez, F.
A1 Gharsallah, M.
A1 Nemes, Norbert Marcel
A1 Biskup Zaja, Nevenko
A1 Varela Del Arco, María
A1 Martínez, J. L.
A1 Fernández Díaz, M. T.
A1 Alonso, J. A.
AB Sb-doped Bi2Te3 is known since the 1950s as the best thermoelectric material for near-room temperature operation. Improvements in material performance are expected from nanostructuring procedures. We present a straightforward and fast method to synthesize already nanostructured pellets that show an enhanced ZT due to a remarkably low thermal conductivity and unusually high Seebeck coefficient for a nominal composition optimized for arc-melting: Bi0.35Sb1.65Te3. We provide a detailed structural analysis of the Bi2−xSbxTe3 series (0 ≤ x ≤ 2) based on neutron powder diffraction as a function of composition and temperature that reveals the important role played by atomic vibrations. Arc-melting produces layered platelets with less than 50 nm-thick sheets. The low thermal conductivity is attributed to the phonon scattering at the grain boundaries of the nanosheets. This is a fast and cost-effective production method of highly efficient thermoelectric materials.
PB Nature Research
YR 2017
FD 2017-07-24
LK https://hdl.handle.net/20.500.14352/91844
UL https://hdl.handle.net/20.500.14352/91844
LA eng
NO Serrano-Sánchez, F., Gharsallah, M., Nemes, N.M. et al. Enhanced figure of merit in nanostructured (Bi,Sb)2Te3 with optimized composition, prepared by a straightforward arc-melting procedure. Sci Rep 7, 6277 (2017). https://doi.org/10.1038/s41598-017-05428-4
NO Ministerio de Economía, Comercio y Empresa (España)
DS Docta Complutense
RD 6 abr 2025