title: Average and Local Crystal Structures of (Ga(1-x)Znx)(N(1-x)Ox) Solid Solution Nanoparticles.
abstract: We report a comprehensive study of the crystal structure of (Ga(1-x)Znx)(N(1-x)Ox) solid solution nanoparticles by means of neutron and synchrotron X-ray scattering. In our study, we used four different types of (Ga(1-x)Znx)(N(1-x)Ox) nanoparticles, with diameters of 10-27 nm and x = 0.075-0.51, which show energy band gaps from 2.21 to 2.61 eV. Rietveld analysis of the neutron diffraction data revealed that the average crystal structure is hexagonal wurtzite (space group P63mc) for the larger nanoparticles, while the crystal structure of smaller nanoparticles is disordered hexagonal. Pair-distribution-function analysis found that the intermediate crystal structure retains a "motif" of the average one; however, the local structure is more disordered. The implications of disorder on the reduced energy band gap are discussed.
authors.affiliation: Chemical and Engineering Materials Division, Spallation Neutron Source (SNS), Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Mikhail
authors.initials: M
authors.lastname: Feygenson
authors.affiliation: Chemical and Engineering Materials Division, Spallation Neutron Source (SNS), Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
authors.forename: Joerg C
authors.initials: JC
authors.lastname: Neuefeind
authors.affiliation: Department of Physics, New Jersey Institute of Technology , Newark, New Jersey 07102, United States.
authors.forename: Trevor A
authors.initials: TA
authors.lastname: Tyson
authors.affiliation: Vanderbilt University , Nashville, Tennessee 37235, United States.
authors.forename: Natalie
authors.initials: N
authors.lastname: Schieber
authors.affiliation: Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201, China.
authors.forename: Wei-Qiang
authors.initials: WQ
authors.lastname: Han