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. 2016 Mar 7;7:10892. doi: 10.1038/ncomms10892

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(a) Δ versus biaxial strain ɛ in two representative CaAl₂Si₂-type Zintl compounds Mg₃Sb₂ and CaZn₂Sb₂. Here biaxial strain ɛ is defined as (a−a₀)/a₀ × 100%, where a₀ and a are the in-plane lattice parameters with unstrained and strained states, respectively. (b) The contour map of calculated zT value of Mg₃Sb₂ at 800 K as a function of hole concentration p and biaxial strain ɛ.