Solid phases of spatially nanoconfined oxygen: A neutron scattering study

Journal Article · Tue Jan 14 00:00:00 EST 2014 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.4860555· OSTI ID:22253605

Kojda, Danny ^[1]; Wallacher, Dirk; Hofmann, Tommy ^[1]; Baudoin, Simon; Hansen, Thomas ^[2]; Huber, Patrick ^[3]

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1. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 14109 Berlin (Germany)
2. Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9 (France)
3. Technische Universität Hamburg-Harburg, 21073 Hamburg (Germany)

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.

• OSTI ID: 22253605
• Journal Information: Journal of Chemical Physics, Vol. 140, Issue 2; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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