title: Size as a Parameter to Stabilize New Phases: Rock Salt Phases of Pb(m)Sb(2n)Se(m+3n).
abstract: A series of Pb(m)Sb(2n)Se(m+3n) nanocrystals (m = 2, 4, 6 and 8; n = 1) are demonstrated that exist only as a distinct phase on the nanoscale. The nanocrystals aggregates are new compounds adopting the cubic NaCl-type structure. These materials form aggregates comprised of nanocrystallites that are attached at a preferred orientation. Elemental compositions were studied using the complementary techniques of scanning transmission electron microscopy/energy dispersive X-ray spectroscopy and inductively coupled plasma-atomic emission spectroscopy. The new ternary nanocrystal aggregates are moderately monodisperse and exhibit well-defined band gap energies in the mid-IR region. The Pb(m)Sb(2n)Se(m+3n) nanomaterials behave as homogeneous solid solutions with lattice parameter trending as a function of Sb incorporation at room temperature and tend to phase separate into PbSe and Sb2Se3 at 400 °C.
authors.affiliation: †Department of Chemistry and ‡Department of Material Science, Northwestern University, Evanston, Illinois 60208 United States.
authors.forename: Ronald B
authors.initials: RB
authors.lastname: Soriano
authors.affiliation: †Department of Chemistry and ‡Department of Material Science, Northwestern University, Evanston, Illinois 60208 United States.
authors.forename: Jinsong
authors.initials: J
authors.lastname: Wu
authors.affiliation: †Department of Chemistry and ‡Department of Material Science, Northwestern University, Evanston, Illinois 60208 United States.
authors.forename: Mercouri G
authors.initials: MG
authors.lastname: Kanatzidis