Year: 2017
Type: article
Abstract: We report the discovery of two ternary Zintl phases Ba 3 Sn 3 Sb 4 and Ba 7– x Sn 11 Sb 15– y ( x = 0.4, y = 0.6). Ba 3 Sn 3 Sb 4 adopts the monoclinic space group P 2 1 / 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 [Sn 3 Sb 4 ] 6– layers extending along the ab -plane with Ba 2+ atoms sandwiched between them. The nonstoichiometric Ba 6.6 Sn 11 Sb 14.4 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 Ba 2+ atoms. Ba 3 Sn 3 Sb 4 is an n-type semiconductor which has a narrow energy gap of ∼0.18 eV and a room temperature carrier concentration of ∼4.2 × 10 18 cm –3 . Ba 6.6 Sn 11 Sb 14.4 is determined to be a metal with electrons being the dominant carriers.
Source: Inorganic Chemistry
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Northwestern University, University of Illinois at Urbana-Champaign, Office of Science, Materials Research Science and Engineering Center, Harvard University, Division of Materials Research, Division of Electrical, Communications and Cyber Systems, Basic Energy Sciences, Argonne National Laboratory
OpenAlex ID: W2767688396