The crystal structures of CeSiO4 and Ca2Ce8(SiO4)6O2

J. M.S. Skakle*, C. L. Dickson, F. P. Glasser

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Two new solubility-limiting phases relevant to nuclear waste disposal are reported, namely CeSiO4 and Ca2Ce8(SiO4)O2, produced by hydrothermal synthesis at 180°C. X-ray diffraction data are presented for both compounds. Rietveld refinement was performed for each of these phases. CeSiO4 was confirmed to be a zircon structure type, with space group I41/amd, unit cell a=6.9564(3), c=6.1953(4) Å. Bond lengths for SiO4 are in excellent agreement with published values; Ce4+ is coordinated to eight oxygen atoms with four regular and four short bonds. Ca2Ce8(SiO4)O2 was shown to have an apatite structure, with space group P63/m and unit cell a=9.4343(3), c = 6.8885(4) Å. The unit cell and bond lengths were found to be slightly smaller than would be expected from other lanthanide-containing analogs; possible reasons for this are discussed.

Original languageEnglish
Pages (from-to)234-238
Number of pages5
JournalPowder Diffraction
Volume15
Issue number4
DOIs
Publication statusPublished - 31 Dec 2000

Fingerprint

Bond length
Crystal structure
Radioactive Waste
Apatites
Lanthanoid Series Elements
Zircon
crystal structure
Rietveld refinement
Hydrothermal synthesis
Apatite
Radioactive wastes
Rare earth elements
cells
Waste disposal
waste disposal
Solubility
radioactive wastes
apatites
Oxygen
X ray diffraction

Keywords

  • Actinide simulants
  • Cement
  • Disposal
  • Nuclear waste
  • Powder diffraction
  • Rietveld refinement

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Instrumentation
  • Condensed Matter Physics

Cite this

The crystal structures of CeSiO4 and Ca2Ce8(SiO4)6O2. / Skakle, J. M.S.; Dickson, C. L.; Glasser, F. P.

In: Powder Diffraction, Vol. 15, No. 4, 31.12.2000, p. 234-238.

Research output: Contribution to journalArticle

Skakle, J. M.S. ; Dickson, C. L. ; Glasser, F. P. / The crystal structures of CeSiO4 and Ca2Ce8(SiO4)6O2. In: Powder Diffraction. 2000 ; Vol. 15, No. 4. pp. 234-238.
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