Semiconducting Ba3Sn3Sb4 and Metallic Ba7-xSn11Sb15-y (x = 0.4, y = 0.6) Zintl Phases

Haijie Chen, Awadhesh Narayan, Constantinos C. Stoumpos, Jing Zhao, Fei Han, Duck Young Chung, Lucas K. Wagner, Wai Kwong Kwok, Mercouri G. Kanatzidis*

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

We report the discovery of two ternary Zintl phases Ba3Sn3Sb4 and Ba7-xSn11Sb15-y (x = 0.4, y = 0.6). Ba3Sn3Sb4 adopts the monoclinic space group P21/c with a = 14.669(3) Å, b = 6.9649(14) Å, c = 13.629(3) Å, and β = 104.98(3)°. It features a unique corrugated two-dimensional (2D) structure consisting of [Sn3Sb4]6- layers extending along the ab-plane with Ba2+ atoms sandwiched between them. The nonstoichiometric Ba6.6Sn11Sb14.4 has a complex one-dimensional (1D) structure adopting the orthorhombic space group Pnma, with unit cell parameters a = 37.964(8) Å, b = 4.4090(9) Å, and c = 24.682(5) Å. It consists of large double Sn-Sb ribbons separated by Ba2+ atoms. Ba3Sn3Sb4 is an n-type semiconductor which has a narrow energy gap of ∼0.18 eV and a room temperature carrier concentration of ∼4.2 × 1018 cm-3. Ba6.6Sn11Sb14.4 is determined to be a metal with electrons being the dominant carriers.

Original languageEnglish (US)
Pages (from-to)14251-14259
Number of pages9
JournalInorganic chemistry
Volume56
Issue number22
DOIs
StatePublished - Nov 20 2017

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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    Chen, H., Narayan, A., Stoumpos, C. C., Zhao, J., Han, F., Chung, D. Y., Wagner, L. K., Kwok, W. K., & Kanatzidis, M. G. (2017). Semiconducting Ba3Sn3Sb4 and Metallic Ba7-xSn11Sb15-y (x = 0.4, y = 0.6) Zintl Phases. Inorganic chemistry, 56(22), 14251-14259. https://doi.org/10.1021/acs.inorgchem.7b02352