Abstract
The products of synthesis of crystalline matrices promising for immobilization of actinides were studied by the method of x-ray phase analysis. The experiments were performed on compositions corresponding to the phase stoichiometry of structural types of zirconolite (CaZrTi2O7) and pyrochlore (CaCeTi2O7, Gd2Ti2O7, Gd2Zr2O7). The experiments were carried out within a temperature range of 800 – 1600°C for a sintering time of 5 – 50 h, in air and in an oxygen temperature. The phase formation conditions in matrices of different compositions are identified. Practical recommendations are issued.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
A. E. Ringwood, S. E. Kesson, K. D. Reeve, et al., “Synroc,” in: Radioactive Waste Forms for the Future, New York (1988), pp. 233–334.
E. R. Vance, C. J. Ball, R. A. Day, et al., “Actinide and rare earth incorporation into zirconolite,” J. Alloys Comp., No. 213/214, 406–409 (1994).
P. E. Raison, R. G. Haire, T. Sato, and T. Ogawa, “Fundamental and technological aspects of actinide oxide pyrochlores: relevance for immobilization matrices,” in: Sci. Bas. Nucl. Waste Managem.-XXII: MRS Symp. Proc., Vol. 556, (1999), pp. 3–10.
B. B. Ebbinghaus, R. A. VanKonynenburg, F. J. Ryerson, et al., “Ceramic Formulation for Immobilization of Plutonium,” in: Proc. Int. Conf. “HLW, LLW, Mix. Wastes and Env. Restor. Working Towards a Clean. Env.”, Sess. No. 65–04 (1998).
E. R. Vance, D. J. Cassidy, C. J. Ball, and G. J. Thorogood, “High-temperature study of CaZrTi2O7,” J. Nucl. Mater., 190, 295–297 (1992).
D. Swenson, T. G. Nieh, and J. H. Fournelle, “The CaO – TiO2 – ZrO2 system at 1200°C and the solubilities of Hf and Gd in zirconolite,” in: Sci. Bas. Nucl. Waste Managem.-XIX: MRS Symp. Proc., Vol. 412 (1996), pp. 337–344.
H. Xu, Y. Wang, R. L. Putnam, et al., “Microstructure and composition of synroc samples crystallized from a CaCeTi2O7 chemical system: HRTEM_EELS Investigation,” in: Sci. Bas. Nucl. Waste Managem.-XXIII: MRS Symp. Proc., Vol. 608 (2000), pp. 461–466.
B. D. Begg and E. R. Vance, “Cerium incorporation in zirconolite,” in: Sci. Bas. Nucl. Waste Managem.-XX: MRS Symp. Proc., Vol. 465 (1997), pp. 333–340.
Yu. A. Pyatenko and A. A. Voronkov, “Comparative characteristics of the crystal-chemical functions of titanium and zirconium in mineral structures,” Izv. Akad. Nauk SSSR, Ser. Geol., No. 9, 77–88 (1977).
S. V. Yudintsev and T. S. Yudintseva, “Nonstoichiometry of pyrochlore Ca(U, Pu)Ti2O7 and problems of brannerite (U, Pu)Ti2O6 in ceramic for actinide immobilization,” in: Proc. 8th Conf. Env. Remed. (ICEM'01), Bruges (2001).
S. V. Stefanovskii, B. S. Nikonov, B. I. Omel'yanenko, et al., “Artificial melted zirconolite-based materials for immobilization of radioactive waste,” Fiz. Khim. Obrab. Mater., No. 6, 111–117 (1997).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Yudintsev, S.V., Stefanovskii, S.V., Jang, Y.N. et al. X-Ray Diffraction Analysis of Phase Formation in Synthesis of Actinide Matrices. Glass and Ceramics 59, 237–241 (2002). https://doi.org/10.1023/A:1020931312984
Issue Date:
DOI: https://doi.org/10.1023/A:1020931312984