Unravelling
the Beneficial Influence of Ag insertion
on the Thermoelectric Properties of the Cluster Compound K2Mo15Se19
Posted on 2020-02-20 - 21:03
Mo-based
cluster compounds are an emerging class of potential candidates
for thermoelectric applications because of several key crystallographic
characteristics that drive their ability to transport heat close to
that of amorphous systems. Here, we report on a detailed investigation
of the crystal structure and high-temperature transport properties
of the cluster compound K2Mo15Se19 and of its Ag-filled variant Ag3K2Mo15Se19. Single-crystal X-ray diffraction confirms that both
compounds crystallize with a hexagonal crystal structure, successfully
solved in the space group R3c, built by octahedral Mo6Se8 and bioctahedral Mo9Se11 clusters with K and
Ag cations filling the large intercluster voids. In agreement with
electronic band structure calculations, the electron transfer that
occurs from the filling cations to the cluster subnetwork provides
a simple guiding rule to predict the evolution of the transport properties
upon filling with Ag. The metallic state observed in K2Mo15Se19 is turned into a more heavily doped
semiconducting character in the presence of Ag resulting in enhanced
thermopower values in Ag3K2Mo15Se19. The beneficial influence of Ag on the thermoelectric properties
is also reflected by lowered lattice thermal conductivity values that
reach 0.45 W m–1 K–1 at 750 K.
These results indicate that inserting an additional element in the
ternaries M2Mo15Se19 is an interesting route to improving their thermoelectric properties.
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Daigre, Gilles; Gougeon, Patrick; Gall, Philippe; Merdrignac-Conanec, Odile; Al Rahal Al Orabi, Rabih; Gautier, Régis; et al. (2020). Unravelling
the Beneficial Influence of Ag insertion
on the Thermoelectric Properties of the Cluster Compound K2Mo15Se19. ACS Publications. Collection. https://doi.org/10.1021/acsaem.9b02488