Author:
Skakle J. M. S.,Dickson C. L.,Glasser F. P.
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 type="bold">abold=6.9564(3), type="bold">cbold=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 type="bold">abold=9.4343(3), type="bold">cbold=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.
Publisher
Cambridge University Press (CUP)
Subject
Condensed Matter Physics,Instrumentation,General Materials Science,Radiation
Reference21 articles.
1. Bond lengths in oxygen and halogen compounds of d and f elements
2. X-ray study of the system ThO2CeO2Ce2O3
3. Von Dreele, R. B., and Larson, A. C. (1998). GSAS-Generalised Crystal Structure Analysis System, Neutron Scattering Centre, Los Alamos National Laboratory, California.
4. The crystal structures of the ThSiO4 polymorphs: huttonite and thorite
5. Crystal structure of synthetic hafnon, HfSiO4, comparison with zircon and the actinide orthosilicates;Speer;Am. Mineral.,1982
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