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Title: Solid phases of spatially nanoconfined oxygen: A neutron scattering study

We present a comprehensive neutron scattering study on solid oxygen spatially confined in 12 nm wide alumina nanochannels. Elastic scattering experiments reveal a structural phase sequence known from bulk oxygen. With decreasing temperature cubic γ-, orthorhombic β- and monoclinic α-phases are unambiguously identified in confinement. Weak antiferromagnetic ordering is observed in the confined monoclinic α-phase. Rocking scans reveal that oxygen nanocrystals inside the tubular channels do not form an isotropic powder. Rather, they exhibit preferred orientations depending on thermal history and the very mechanisms, which guide the structural transitions.
Authors:
 [1] ;  [2] ; ;  [1] ; ;  [3] ;  [4]
  1. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin (Germany)
  2. (Germany)
  3. Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France)
  4. Technische Universität Hamburg-Harburg, 21073 Hamburg (Germany)
Publication Date:
OSTI Identifier:
22253605
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM OXIDES; ANTIFERROMAGNETISM; ELASTIC SCATTERING; GRAIN ORIENTATION; MONOCLINIC LATTICES; NANOSTRUCTURES; NEUTRON DIFFRACTION; ORTHORHOMBIC LATTICES; OXYGEN; POWDERS; SOLIDS