Electron Poor Materials Research Group

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Presentation transcript:

Electron Poor Materials Research Group EPMRG

Synthesis, Characterizations and Properties of Thermoelectric Zn-Sb-In & “Thermoelectric” (ZnSnSb2)x(InSb)2-2x Yang Wu

Outline Thermoelectric Zn-Sb-In Ternaries Synthesis explorations of Zn-Sb-In system Property Characterizations Solid Solution (ZnSnSb2)1-x(InSb)2x Metal-Non Metal Transition Thermoelectric Property

Motivation – Thermoelectric b-Zn4Sb3 E – EF (eV) 37 e- for Zn6Sb5 38 e- to be electron precise Zn5InSb5? Zn In Sb Electronegativity 1.6 1.7 1.9 Sootsman, J. R.; Chung, D.; Kanatzidis, M. Angewandte Chemie International Edition 2009, 48, 8616-8639. Haussermann, U.; Mikhaylushkin, A. S. Dalton Trans. 2010, 39, 1036-1045.

Synthetic Exploration of Zn-Sb-In System Region 2:Zn5Sb4In2 Pbcn (No. 60), Z=4 Region 2:Zn9Sb6In2 P21 21 21(No. 19), Z=8 Metastable Region 1:Zn4Sb3 Wu, Y.; Lidin, S.; Groy, T. L.; et al. Inorganic Chemistry 2009, 48, 5996-6003.

Structural and Phase Relations of Zn5Sb4In2-d & Zn9Sb6In2: I

Structural and Phase Relations of Zn5Sb4In2-d & Zn9Sb6In2: II

Thermoelectric Property Characterizations for Zn5Sb4In2-δ: I Wu, Y.; Lidin, S.; Groy, T. L.; et al. Inorganic Chemistry 2009, 48, 5996-6003.

Thermoelectric Property Characterizations for Zn5Sb4In2-δ: II

Sphalerite-type solid solution (ZnSnSb2)1-x(InSb)2x + 4Sn

Future Work Growth of B crystal in metal melts (Cu, Pt, Ni etc.) Make SiB3, a reported III-IV compound Transport property measurements of (ZnSnSb2)1-x(InSb)2x