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Title: Pyrochlore to fluorite transitions - ordering in fluorites?
Authors: Whittle, KR
Cranswick, LMD
Redfern, SAT
Swainson, IP
Lumpkin, GR
Keywords: Pyrochlore
Neutron diffraction
Electron microscopy
Diffuse scattering
Issue Date: 1-Dec-2008
Publisher: Materials Research Society
Citation: Whittle, K. R., Cranswick, L. M., Redfern, S. A. T., Swainson, I. P., & Lumpkin, G. R. (2008). Pyrochlore to fluorite transitions - ordering in fluorites? 2008 MRS Fall Meeting, 1st – 5th December 2008. Boston, Massachusetts, United States of America: Hynes Convention Center. In K.E. Sickafus, A. Navrotsky, S.R. Phillpot (Eds.), MRS Proceedings: Structure/Property Relationships in Fluorite-Derivative Compounds, 1122E, 66-71(1122-O03-01). doi:10.1557/PROC-1122-O03-01
Abstract: Two systems have been studied La2-xYxZr2O7 and La2-xYxHf2O7, as part of an on-going study of radiation tolerance in nuclear waste forms and related oxide materials. The structural effects of increasing Y content in La based zirconate and hafnate pyrochlores have been studied with neutron diffraction and electron microscopy. Results have shown a difference in structural stability for both the pyrochlore and fluorite phases within each system, including the presence of two-phase regions in both systems. In the zirconate, the two-phase region lies in the range x = 0.9-1.6. This is shifted to higher Y content in the hafnate system and lies in the range of x = 1.5 to approximately 1.8-1.9. In addition to the differences in phase stability, electron diffraction, predominantly down the [110] zone axis, has shown evidence for ordering in the form of structured diffuse scattering within the fluorite phases.
Gov't Doc #: 2282
ISSN: 0272-9172
Appears in Collections:Conference Publications

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