RT Journal Article
T1 SnSe: Kx intermetallic thermoelectric polycrystals prepared by arc-melting
A1 Gainza, Javier
A1 Molto, Sergio
A1 Serrano Sánchez, Federico
A1 Dura, Óscar
A1 Fernández Díaz, Maria Teresa
A1 Biskup Zaja, Nevenko
A1 Martínez, Jose Luis
A1 Alonso, José Antonio
A1 Nemes, Norbert Marcel
AB Neutron powder diffraction and thermoelectric characterization of SnSe:Kx intermetallic alloys are presented. Nanostructured ingots were prepared by arc-melting elemental tin and selenium along with potassium hydride. Up to x = 0.1 of K can be incorporated into SnSe. Rietveld refinement of the diffractograms locates potassium on the Sn site in the high-temperature Cmcm structure. However, in the low-temperature Pnma structure, K cannot be localized by difference Fourier maps, indicating the incorporation of K in a disordered form in the interlayer space. STEM-EELS indicates the incorporation of K into the SnSe grains. The resistivity upon K-doping at intermediate temperatures decreases by 1–2 orders of magnitude, but at high temperature is higher than the undoped SnSe. The Seebeck coefficient of K-doped SnSe remains p-type and almost temperature independent (400 μV/K for x = 0.1). The ultralow thermal conductivity of undoped SnSe decreases further upon K-doping to below 0.3 W/m K.
PB Springer
SN 0022-2461
YR 2022
FD 2022
LK https://hdl.handle.net/20.500.14352/91198
UL https://hdl.handle.net/20.500.14352/91198
LA eng
NO J. Gainza, S. Moltó, F. Serrano-Sánchez, O. J. Dura, M. T. Fernández-Díaz, N. Biškup, J. L. Martínez, J. A. Alonso, and N. M. Nemes, J Mater Sci 57, 8489 (2022).
NO CRUE-CSIC (Acuerdos Transformativos 2022).The online version contains supplementary material available at https://doi.org/10.1007/s10853-021-06864-4.
NO Ministerio de Ciencia, Innovación y Universidades (España)
DS Docta Complutense
RD 21 ene 2026