title: Melting and Sintering of a Body-Centered Cubic Superlattice of PbSe Nanocrystals Followed by Small Angle X-ray Scattering.
abstract: The structural evolution of a body-centered cubic (bcc) superlattice of 6.6 nm diameter organic ligand-coated PbSe nanocrystals was studied in situ by small angle X-ray scattering (SAXS) as it was heated in air from room temperature to 350°C. As it was heated above room temperature, the superlattice contracted slightly, but maintained bcc structure up to 110°C. Once the temperature rose above 110°C, the superlattice began to disorder, by first losing long-range translational order and then local positional order. At temperatures exceeding 168°C, the nanocrystals sintered and oxidized, transforming into PbSeO(3) nanorods.
authors.affiliation: Department of Chemical Engineering, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin, Austin, Texas 78712-1062.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Goodfellow
authors.forename: Reken N
authors.initials: RN
authors.lastname: Patel
authors.forename: Matthew G
authors.initials: MG
authors.lastname: Panthani
authors.forename: Detlef-M
authors.initials: DM
authors.lastname: Smilgies
authors.forename: Brian A
authors.initials: BA
authors.lastname: Korgel