RT Journal Article
T1 Lithium‐filled skutterudites by intercalation at ambient‐temperature
A1 Prado Gonjal, Jesús de la Paz
A1 Vaqueiro, Paz
A1 Kowalczyk, Radoslaw
A1 Smith, Ronald
A1 Powell, Anthony
AB The incorporation of lithium as a filler species in Co1‐2xFexNixSb3 skutterudites was accomplished by intercalation at 60 °C, using n‐BuLi as a reducing agent. Solid state 7Li NMR and ICP‐MS analysis confirm the presence of lithium in the product phases and provide an estimate of the lithium content. The maximum uptake of lithium increases as cobalt is progressively substituted by an equimolar mixture of iron and nickel. Difference Fourier maps, calculated during Rietveld structure refinement using powder neutron diffraction data, locate the lithium cations at the 2a (0,0,0) sites within the cavities of the skutterudite framework. The intercalation of lithium results in reductions in thermal conductivity of up to 47 %, indicative of phonon glass electron crystal (PGEC) type behaviour. Charge transfer from lithium to the framework that accompanies intercalation results in a substantial decrease in electrical resistivity in lithiated phases and a more metal‐like temperature dependence. The increased carrier concentration also decreases the Seebeck coefficient, with the consequence that modest increases in the figure of merit occur, despite the reduced thermal conductivity.
PB Wiley
SN 0044-2313
SN 1521-3749
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/88939
UL https://hdl.handle.net/20.500.14352/88939
LA eng
NO J. Prado-Gonjal, P. Vaqueiro, R. M. Kowalczyk, R. I. Smith, A. V. Powell, Z. Anorg. Allg. Chem. 2023, 649, e202300087
NO Engineering and Physical Sciences Council (Reino Unido)
DS Docta Complutense
RD 11 abr 2025