Pyrochlore to fluorite transitions - Ordering in fluorites?

Karl R. Whittle; Lachlan M. Cranswick; Simon A.T. Redfern; Ian P. Swainson; Gregory R. Lumpkin

doi:10.1557/proc-1122-o03-01

Pyrochlore to fluorite transitions - Ordering in fluorites?

Karl R. Whittle, Lachlan M. Cranswick, Simon A.T. Redfern, Ian P. Swainson, Gregory R. Lumpkin

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

Two systems have been studied La_2-xY_xZr ₂O₇ and La_2-xY_xHf₂O ₇, 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.

Original language	English
Title of host publication	Structure/Property Relationships in Fluorite-Derivative Compounds
Publisher	Materials Research Society
Pages	66-71
Number of pages	6
ISBN (Print)	9781615677627
DOIs	https://doi.org/10.1557/proc-1122-o03-01
Publication status	Published - 2008
Externally published	Yes
Event	2008 MRS Fall Meeting - Boston, MA, United States Duration: Dec 1 2008 → Dec 5 2008

Publication series

Name	Materials Research Society Symposium Proceedings
Volume	1122
ISSN (Print)	0272-9172

Conference

Conference	2008 MRS Fall Meeting
Country/Territory	United States
City	Boston, MA
Period	12/1/08 → 12/5/08

ASJC Scopus Subject Areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1557/proc-1122-o03-01

Cite this

@inproceedings{14bbaf997f334fbf93a87622645f3640,

title = "Pyrochlore to fluorite transitions - Ordering in fluorites?",

abstract = "Two systems have been studied La2-xYxZr 2O7 and La2-xYxHf2O 7, 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.",

author = "Whittle, {Karl R.} and Cranswick, {Lachlan M.} and Redfern, {Simon A.T.} and Swainson, {Ian P.} and Lumpkin, {Gregory R.}",

year = "2008",

doi = "10.1557/proc-1122-o03-01",

language = "English",

isbn = "9781615677627",

series = "Materials Research Society Symposium Proceedings",

publisher = "Materials Research Society",

pages = "66--71",

booktitle = "Structure/Property Relationships in Fluorite-Derivative Compounds",

address = "United States",

note = "2008 MRS Fall Meeting ; Conference date: 01-12-2008 Through 05-12-2008",

}

Whittle, KR, Cranswick, LM, Redfern, SAT, Swainson, IP & Lumpkin, GR 2008, Pyrochlore to fluorite transitions - Ordering in fluorites? in Structure/Property Relationships in Fluorite-Derivative Compounds. Materials Research Society Symposium Proceedings, vol. 1122, Materials Research Society, pp. 66-71, 2008 MRS Fall Meeting, Boston, MA, United States, 12/1/08. https://doi.org/10.1557/proc-1122-o03-01

Pyrochlore to fluorite transitions - Ordering in fluorites? / Whittle, Karl R.; Cranswick, Lachlan M.; Redfern, Simon A.T. et al.
Structure/Property Relationships in Fluorite-Derivative Compounds. Materials Research Society, 2008. p. 66-71 (Materials Research Society Symposium Proceedings; Vol. 1122).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution