Transmission Electron Microscopy Studies of NaLaMgWO[sub6]: Spontaneous Formation of Compositionally Modulated Stripes.
Transmission electron microscopy studies of the perovskite NaLaMgWO[sub6] reveal the formation of a complex, compositionally modulated structure. Annular dark field scanning transmission electron microscopy images and scanning transmission electron microscopy-electron energy-loss spectroscopy scans...
| Publicado en: | Journal of the American Chemical Society Vol. 130; no. 45; pp. 15028 - 15038 |
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| Autores principales: | , , , , |
| Formato: | Artículo |
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American Chemical Society
11/12/2008
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=35398451&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 35398451 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 11/12/2008 vid: 130 iid: 45 pid: 997 pub: American Chemical Society artinfo: ui: 35398451 10.1021/ja802511d ppf: 15028 ppct: 10 formats: tig: atl: Transmission Electron Microscopy Studies of NaLaMgWO[sub6]: Spontaneous Formation of Compositionally Modulated Stripes. aug: au: García-Martín, Susana Esteban Urones-Garrote Knapp, Meghan C. King, Graham Woodward, Patrick M. affil: Departamento de Química Inorgánica, Facultad de Ciencias Quínzicas, Universidad Complutense, Madrid-28040, Spain Department of Chemistry, Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210-1185 Department of Chemistry, Georgetown College, Georgetown, KY su: Electron microscopy Perovskite Electron energy loss spectroscopy Modulation spectroscopy Electron diffraction Stoichiometry sug: subj: Electron microscopy Perovskite Electron energy loss spectroscopy Modulation spectroscopy Electron diffraction Stoichiometry ab: Transmission electron microscopy studies of the perovskite NaLaMgWO[sub6] reveal the formation of a complex, compositionally modulated structure. Annular dark field scanning transmission electron microscopy images and scanning transmission electron microscopy-electron energy-loss spectroscopy scans show that this modulation involves a repeating pattern of La-rich and La-poor stripes, each stripe 6a[subp] or ∼24 Å wide (where a[subp] is the edge length of the simple cubic perovskite unit cell). High-resolution transmission electron microscopy images clearly show, and electron diffraction patterns confirm, a periodicity of 12a[subp] along either the [100][subp] or [010][subp], direction. Available evidence suggests a spontaneous separation into stripes that possess the nominal stoichiometry, NaLaMgWO[sub6], alternating with Na-poor/La-rich stripes that have a stoichiometry of (La[subx]Na[sub1-3x])LaMgWO[sub6]. X-ray powder diffraction measurements are insensitive to this intricate structural complexity, which may be a more widespread feature of (A[sup+]Ln[sup3+])MM'O[sub6] perovskites than previously appreciated. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2008 holdings: @attributes: islocal: N |
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