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Oxide Ion Disorder in Nd2Hf2O7

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The compound Nd2Hf2O7 was synthesized via a solid-state route and the crystal structure determined by electron diffraction and Rietveld refinement of both X-ray and neutron diffraction data. A small amount of disorder was found on the anion sublattice, while no evidence of disorder in the cation sublattice could be verified. The compound is cubic with space group Fd 3m, structurally lying between the ideal pyrochlore and fluorite forms, with 0.26% of the oxide ions residing on the 8a sites usually vacant in pyrochlores. The lattice constant is 10.6469(2) Å, and the overall fit parameter was Rwp=0.0398.
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Document Type: Research Article

Affiliations: 1: Department of Materials, Queen Mary, University of London, Mile End Road, London E1 4NS, UK 2: Centre for Materials Research, School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK

Publication date: January 1, 2008

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