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Oxide Ion Disorder in Nd 2 Hf 2 O 7
Author(s) -
Ubic Rick,
Abrahams Isaac,
Hu Yi
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02025.x
Subject(s) - rietveld refinement , pyrochlore , fluorite , lattice constant , neutron diffraction , ion , crystallography , crystal structure , oxide , diffraction , materials science , lattice (music) , chemistry , physics , organic chemistry , optics , metallurgy , phase (matter) , acoustics
The compound Nd 2 Hf 2 O 7 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 3 m , structurally lying between the ideal pyrochlore and fluorite forms, with 0.26% of the oxide ions residing on the 8 a sites usually vacant in pyrochlores. The lattice constant is 10.6469(2) Å, and the overall fit parameter was R wp =0.0398.