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p-type Ce1.05Fe4Sb12.04 filled skutterudites with much improvedthermoelectric properties have been synthesized by rapidly converting nearlyamorphous ribbons into crystalline pellets under pressure. It is found thatthis process greatly suppresses grain growth and second phaseformation/segregation, and hence results in the samples consisting ofnano-sized grains with strongly-coupled grain boundaries, as observed bytransmission electron microscopy. The room temperature carrier mobility inthese samples is significantly higher (nearly double) than those in the samplesof the same starting composition made by the conventional solid-state reaction.Nanostructure reduces the lattice thermal conductivity, while cleaner grainboundaries permit higher electron conduction.

Strong impact of grain boundaries on the thermoelectric properties of  non-equilibrium synthesized p-type Ce1.05Fe4Sb12.04 filled skutterudites with  nanostructure