An exploration of noble metal substitution in germanium based clathrates : International Conference on Thermoelectrics (2008)

• The thermopower (S) is sensitive to changes in the d. of states (g()) near the Fermi level (F). Strongly correlated electron systems with transitions metals and/or rare earth elements exhibit sharp d. of states features near the Fermi level due to the d and f states. This leads to the large thermopowers often found in these compds. A wide variety of germanium based clathrates contg. transition metals form (Ba8TM-xGe46-x where TM = Ni, Pd, Pt, Cu, Ag and Au are known to exist). Enhancement of the thermopower while retaining the low thermal cond. and relatively high elec. cond. characteristic of the clathrates will improve thermoelec. performance of these compds. As part of an ongoing investigation of transition metal substituted clathrates, in this paper we present a characterization of the structural and electronic transport properties of two p-type silver and gold substituted samples. Recently the thermoelec. properties of several Ba8AuxGe46-x samples were presented in a proceedings paper, but to the best of our knowledge this is the first time thermoelec. properties are presented for Ba8Ag6Ge40.

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