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

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(a) Calculated Δ as a function of the lattice constant a in CaAl₂Si₂-type Zintl compounds with E_g<1.5 eV. The stars correspond to solid solutions YbCd_1.5Zn_0.5Sb₂ and EuZn_1.75Cd_0.25Sb₂ with nearly zero Δ values. Reported values¹⁸,¹⁹,²⁰,²¹,²²,²³,²⁴,²⁵,²⁶,²⁷,²⁸,²⁹,³⁰,³¹,³²,³³ of thermal conductivity at 500 K are shown in colour bar. (b) Calculated Δ versus the fraction x in two representative solid solutions Yb(Zn_1–xCd_x)₂Sb₂ and Eu(Zn_1–xCd_x)₂Sb₂. The stars represent solid solutions YbCd_1.5Zn_0.5Sb₂ and EuZn_1.75Cd_0.25Sb₂ with nearly zero Δ values. (c,d) Temperature dependence of power factors¹⁸,¹⁹ α²σ (c) and zT values¹⁸,¹⁹ (d) of YbZn₂Sb₂ (EuZn₂Sb₂), YbCd₂Sb₂ (EuCd₂Sb₂) and their solid solutions YbCd_1.6Zn_0.4Sb₂ and EuZn_1.8Cd_0.2Sb₂.