Neutron Powder Diffraction Studies of Fluorite and Pyrochlore NdxZr1-xO2-x/2 Solid Solutions with 0.25<x<0.55

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Dijk, T. van and Helmholdt, R.B. and Burggraaf, A.J. (1980) Neutron Powder Diffraction Studies of Fluorite and Pyrochlore NdxZr1-xO2-x/2 Solid Solutions with 0.25<x<0.55. Physica Status Solidi B: Basic research, 101 (2). pp. 765-774. ISSN 0370-1972

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Abstract:Neutron powder diffraction studies on stoichiometric and non-stoichiometric pyrochlore phases of the ZrO2- Nd2O3 system show remarkable differences in the occupation factor of the 8b site of space group Fd3m to which the pyrochlore phase belongs. Stoichiometric Nd2Zr2O7 can be described as a perfect pyrochlore phase in which the 8b site is either vacant or at least has a low occupation factor. The occupation factors of the 8b sites of non-stoichiometric NdxZr1-xO2-x/2 pyrochlores reveal that these contain a large degree of disorder in the anion sublattice. Best refinement results on non-stoichiometric materials are achieved when the overall structure of the non-stoichiometric pyrochlore phase is described as a hybrid phase consisting of a major volume fraction of the stoichiometric pyrochlore phase and a minor fraction of the defect fluorite phase.
Item Type:Article
Copyright:© 1980 Wiley InterScience
Link to this item:http://purl.utwente.nl/publications/70716
Official URL:http://dx.doi.org/10.1002/pssb.2221010239
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