Thermoelectric Properties of Cr$&-Type Selenides

Several compounds with the Cr3S4 structure type have been studied for their thermoelectric properties. All exhibit low lattice thermal conductivity of about 15 mW/cmK, independent of temperature. Many of the compounds, such as Co3Se4, Ni3Se4, Fe3Se4, Ti3Se4, FeNizSe4, and FeCozSe4, are metals with relatively low electrical resistivity and Seebeck coefficient. The Crcontaining compounds, such as Cr3Se4, NiCr2Se4, Figure 1. Illustration of the Cr3S4 CoCr2Se4, and FeCr2Se4, have the lugest unit cell showing S atoms as spheres Seebeck coefficients and highest resistivity. and Cr atoms (not shown) at the The most promising of these materials for center of the shaded octahedra. The thermoelectric applications is FeCr2Se4. vertical chain of face sharin