Fig. 4
From: Insights into the design of thermoelectric Mg3Sb2 and its analogs by combining theory and experiment
Solid solution map and biaxial strain engineering for materials design. a Calculated Δ versus the lattice constant a in CaAl2Si2-type compounds with Eg < 1.5 eV. Reported thermal conductivities14,15,17,18,19,20,21,22,23,24,25,26,27,39,40,41 at 500 K are shown in color bar. The stars correspond to solid solutions YbCd1.5Zn0.5Sb2 and EuZn1.75Cd0.25Sb2 with nearly zero Δ values. b Δ as a function of biaxial strain ε in two representative CaAl2Si2-type compounds Mg3Sb2 and CaZn2Sb2. Biaxial strain ε is defined as (a − a0)/a0 × 100%, where a0 and a are the in-plane lattice parameters with unstrained and strained states, respectively. Figure is adapted from ref. 105, CC-BY-4.0
