1. XRD patterns of ZrNiSn and Zr_0.5Hf_0.5Ni_1-xPt_xSn

2. Secondary electron images of Zr_0.5Hf_0.5Ni_1-xPt_xSn

3. EPMA elemental mappings of nominal Zr_0.5Hf_0.5Ni_0.85Pt_0.15Sn sample

4. (a) Temperature dependence of electrical conductivity, (b) room temperature carrier concentration and carrier mobility varied with Pt content, temperature dependence of (c) Seebeck coefficient and (d) power factor of ZrNiSn and Zr_0.5Hf_0.5Ni_1-xPt_xSn

5. Temperature dependence of (a) thermal diffusivity and (b) specific heat capacity for ZrNiSn and Zr_0.5Hf_0.5Ni_1-xPt_xSn samples

6. (a) Temperature dependence of total thermal conductivity, (b) change of lattice thermal conductivity with configuration entropy at 923 K, (c) temperature dependence of lattice thermal conductivity of Zr_0.5Hf_0.5Ni_1-xPt_xSn (x=0, 0.1, 0.15, 0.2, 0.25, 0.3), and (d) comparison of lattice thermal conductivity of different samples ^{[17,23-24,35]}

7. ZT of ZrNiSn and Zr_0.5Hf_0.5Ni_1-xPt_xSn samples