Achieving High Thermoelectric Performance in Rare-Earth Element-Free CaMg2Bi2 with High Carrier Mobility and Ultralow Lattice Thermal Conductivity
(a) The electrical conductivity as a function of temperature for Bax () samples. (b) Temperature-dependent carrier concentration and mobility for BaxZny (;). The dotted line represents the relationship of ~T-1.5. (c) Temperature-dependent Seebeck coefficient for Bax samples. (d) Room temperature Seebeck coefficient vs carrier concentration for our work and the previously reported data [33, 42–44], where the black curve is calculated Pisarenko plot with . (e) Variation of the PF for Bax samples. (f) Carrier concentration dependent at different temperatures. The solid lines are calculated based on SPB with the hypothesis of the insensitive to carrier concentration. The fitting values are 164, 130, and 102 cm-2 V-1 s-1 at 300 K, 400 K, and 500 K, respectively.