The precise crystal structure of Zn
4Sb
3, which is one of the most efficient thermoelectric materials, has been determined by combination of Maximum Entropy Method and Rietveld analysis using synchrotron-radiation powder diffraction at SPring-8. The identification of Sb
3- ions and Sb2
4- dimers reveals that Zn
4Sb
3 is a valence semiconductor with the ideal stoichiometry Zn
13Sb
10. The structure contains significantly disordered with zinc atoms distributed over multiple positions. The crystal structure of Zn
4Sb
3 in present study allows a general explanation of the thermal conductivity which explains the remarkable thermoelectric figure of merit.
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