Calcium uranium titanate-A new pyrochlore

F. J. Dickson; K. D. Hawkins; T. J. White

doi:10.1016/0022-4596(89)90234-X

Calcium uranium titanate-A new pyrochlore

F. J. Dickson, K. D. Hawkins, T. J. White^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Calcium uranium dititanate pyrochlore (A₂B₂O₇), a component of a high-level nuclear waste ceramic, was characterized by powder X-ray diffraction, analytical electron microscopy and selected area electron diffraction. The cubic unit cell (a = 10.1579(5) Å) has symmetry Fd3m with A in 16(c), B in 16(d), O₁ in 48(f), and O₂ in 8(a). A preliminary examination of the peak intensity in X-ray powder patterns and chemical analyses by energy dispersive X-ray spectroscopy suggest that although this pyrochlore can be approximately described by the crystallochemical formula [Ca, U][Ti₂]O₇ the Ca U ratio may deviate from unity with some trivalent titanium partitioning onto the A-site.

Original language	English
Pages (from-to)	146-150
Number of pages	5
Journal	Journal of Solid State Chemistry
Volume	82
Issue number	1
DOIs	https://doi.org/10.1016/0022-4596(89)90234-X
Publication status	Published - Sept 1989
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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10.1016/0022-4596(89)90234-X

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title = "Calcium uranium titanate-A new pyrochlore",

abstract = "Calcium uranium dititanate pyrochlore (A2B2O7), a component of a high-level nuclear waste ceramic, was characterized by powder X-ray diffraction, analytical electron microscopy and selected area electron diffraction. The cubic unit cell (a = 10.1579(5) {\AA}) has symmetry Fd3m with A in 16(c), B in 16(d), O1 in 48(f), and O2 in 8(a). A preliminary examination of the peak intensity in X-ray powder patterns and chemical analyses by energy dispersive X-ray spectroscopy suggest that although this pyrochlore can be approximately described by the crystallochemical formula [Ca, U][Ti2]O7 the Ca U ratio may deviate from unity with some trivalent titanium partitioning onto the A-site.",

author = "Dickson, {F. J.} and Hawkins, {K. D.} and White, {T. J.}",

year = "1989",

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T1 - Calcium uranium titanate-A new pyrochlore

AU - Dickson, F. J.

AU - Hawkins, K. D.

AU - White, T. J.

PY - 1989/9

Y1 - 1989/9

N2 - Calcium uranium dititanate pyrochlore (A2B2O7), a component of a high-level nuclear waste ceramic, was characterized by powder X-ray diffraction, analytical electron microscopy and selected area electron diffraction. The cubic unit cell (a = 10.1579(5) Å) has symmetry Fd3m with A in 16(c), B in 16(d), O1 in 48(f), and O2 in 8(a). A preliminary examination of the peak intensity in X-ray powder patterns and chemical analyses by energy dispersive X-ray spectroscopy suggest that although this pyrochlore can be approximately described by the crystallochemical formula [Ca, U][Ti2]O7 the Ca U ratio may deviate from unity with some trivalent titanium partitioning onto the A-site.

AB - Calcium uranium dititanate pyrochlore (A2B2O7), a component of a high-level nuclear waste ceramic, was characterized by powder X-ray diffraction, analytical electron microscopy and selected area electron diffraction. The cubic unit cell (a = 10.1579(5) Å) has symmetry Fd3m with A in 16(c), B in 16(d), O1 in 48(f), and O2 in 8(a). A preliminary examination of the peak intensity in X-ray powder patterns and chemical analyses by energy dispersive X-ray spectroscopy suggest that although this pyrochlore can be approximately described by the crystallochemical formula [Ca, U][Ti2]O7 the Ca U ratio may deviate from unity with some trivalent titanium partitioning onto the A-site.

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Calcium uranium titanate-A new pyrochlore

Abstract

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