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Effect of Synthesis Conditions on Phase Composition of Pyrochlore-Brannerite Ceramics

Published online by Cambridge University Press:  21 March 2011

S.V. Stefanovsky ,
S.V. Yudintsev ,
B.S. Nikonov ,
M.I. Lapina  and
A.S. Aloy
S.V. Stefanovsky
Affiliation:
SIA “Radon”, 7th Rostovskii per., 2/14, Moscow 119121Russia, Email: itbstef@cityline.ru
S.V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii 35, Moscow 109035, Russia
B.S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii 35, Moscow 109035, Russia
M.I. Lapina
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii 35, Moscow 109035, Russia
A.S. Aloy
Affiliation:
V.G. Khlopin Radium Institute, 2nd Murinskii pr. St-Petersburg, Russia
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Abstract

Three melted samples of pyrochlore-brannerite-based ceramics produced under different redox conditions were examined. Two of the samples were produced using cold crucible melting at ~1600 C. The third sample was obtained via melting in a microwave oven at 1700-1800 C. All the samples are composed of major pyrochlore and brannerite phases, and minor rutile and UO2-based solid solution or pseudobrookite phases. Pyrochlore-structured phases predominate in all three samples and account for 50-60% of the total bulk. Two pyrochlore varieties – Ca-pyrochlore (predominant) and Ba-pyrochlore have been found in these samples. The latter phase is more stable at high temperatures than the Ba-hollandite present in sintered pyrochlore-rich Synroc-F ceramics. Decomposition of the Ba-hollandite results in rutile formation in the melted samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 315
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. Laverov, N.P., Omelianenko, B.I., Yudintsev, S.Y., Nikonov, B.S., Sobolev, I.A., Stefanovsky, S.V., Geol. Ore Deposits. 39 (1997) 179.Google Scholar
2. Ringwood, A.E. // Miner. Mag. 49 (1985) 159.Google Scholar
3. Ryerson, F.J. // J. Amer. Ceram. Soc. 66 (1983) 629.Google Scholar
4. Ringwood, A.E., Kesson, S.E., Reeve, K.D. et. al. in Radioactive Wastes Forms for the Future, Lutze, W. and Ewing, R.C., Eds., Elsev. Publ., N.-Holl. 1988, pp.233–334.Google Scholar
5. Vance, E.R., Jostsons, A., Day, R.A., Ball, C.J., Begg, B.D., and Angel, P.J., Mat. Res. Soc. Symp. Proc. 412 (1996) 41.Google Scholar
6. Solomah, A.G., Sridhar, T.S., and Jones, S.C., in: Advances in Ceramics. Nuclear Waste Management, Clark, D.E., White, W.B. and Machiels, A.J., Eds., Amer. Ceramic Society, Columbus, Ohio, 8 (1986) pp.259–265.Google Scholar
7. Gould, T., Myers, B., Gray, L., Edmunds, T., in: Proc. 3-rd Topical Meet. on DOE Spent Nucl. Fuel and Fiss. Mat. Manag., Sept. 8-11, 1998, Charleston, SC, pp.366–373.Google Scholar
8. Ebbinghaus, B., VanKonynenburg, R., Shaw, H., Vance, E.R., Stewart, M., Congdon, J., Rankin, T., Allender, J., and Vienna, J., Ibid. p. 431.Google Scholar
9. Ebbinghaus, B.B., VanKonynenburg, R.A., Ryerson, F.J., Vance, E.R., M.W.A. Stewart, Jostsons, A., Allender, J.S., Rankin, T., and Congdon, J., in: Waste Management '98. Proc. Int. Symp. 1998. Rep. 65-04. CD Rom.Google Scholar
10. Sobolev, I.A., Stefanovsky, S.V., Lifanov, F.A., Mat. Res. Soc. Symp. Proc. 353 (1995) 833.Google Scholar
11. Stefanovsky, S.V., Knyazev, O.A., Lopukh, D.B., Ioudintsev, S.V., in IT3 Conference. Int. Conf. On Incineration & Thermal Treatment Technologies. Proceedings. May 11-15, 1998. Salt Lake City. 1998. P. 155–158.Google Scholar
12. Alexandrov, V.I., Osiko, V.V., Prokhorov, A.M., Tatarintsev, V.M., AS USSR Herald, [12[ (1973) 29.Google Scholar
13. Oversby, V.M. and Vance, E.R., Mat. Res. Soc. Symp. Proc. 353 (1995) 825.Google Scholar
14. Stefanovsky, S.V., Yudintsev, S.V., Ochkin, A.V., Ptashkin, A.G., and Chizhevskaya, S.V., Mat. Res. Soc. Symp. Proc. 506 (1998) 261.Google Scholar
15. Sobolev, I.A., Stefanovsky, S.V., Omelianenko, B.I., Yudintsev, S.V., Vance, E.R., and Jostsons, A., Mat. Res. Soc. Symp. Proc. 465 (1997) 363.Google Scholar
16. Pentinghaus, H., in: Proc. Intern. Seminar on Chemistry and Process Engineering for High Level Waste Solidification, Julich, 2 (1982), pp.713–731.Google Scholar
17. Vance, E.R., Urquhart, S., Anderson, D., and George, I.M., in: Advances in Ceramics. Nuclear Waste Manag., 20 (1996), pp.249–258.Google Scholar
18. Yamazaki, H. and Inoue, Y., Mat. Res. Soc. Symp. Proc. 353 (1995) 817.Google Scholar
19. Buck, E.C., Ebbinghaus, B., Bakel, A.J., and Bates, J.K., Mat. Res. Soc. Symp. Proc. 465 (1997) 1259.Google Scholar