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Synthesis and characterisation of transition metal substituted barium hollandite ceramics

Published online by Cambridge University Press:  21 March 2011

Neil C. Hyatt ,
Martin C. Stennett ,
Steven G. Fiddy ,
Jayne S. Wellings ,
Sian S. Dutton ,
Ewan R. Maddrell ,
Andrew J. Connelly  and
William E. Lee
Neil C. Hyatt
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK
Martin C. Stennett
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK
Steven G. Fiddy
Affiliation:
CCLRC Daresbury Laboratory, Warrington, WA4 4AD., UK
Jayne S. Wellings
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK
Sian S. Dutton
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK
Ewan R. Maddrell
Affiliation:
Nexia Solutions Ltd., Sellafield, Seascale, Cumbria, CA20 1PG., UK
Andrew J. Connelly
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK
William E. Lee
Affiliation:
Immobilisation Science Laboratory, Department of Engineering Materials, The University of Sheffield, Mappin Street, Sheffield, S1 3JD., UK
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Abstract

A range of transition metal bearing hollandite phases, formulated Ba1.2B1.2Ti6.8O16 (B2+ = Mg, Co, Ni, Zn, Mn) and Ba1.2B2.4Ti5.6O16 (B3+ = Al, Cr, Fe) were prepared using an alkoxide - nitrate route. X-ray powder diffraction demonstrated the synthesis of single phase materials for all compositions except B = Mn. The processing conditions required to produce > 95 % dense ceramics were determined for all compositions, except B = Mg for which the maximum density obtained was > 93 %. Analysis of transition metal K-edge XANES data confirmed the presence of the targeted transition metal oxidation state for all compositions except B = Mn, where the overall oxidation state was found to be Mn3+. The K-edge EXAFS data of Ba1.2B1.2Ti6.8O16 (B = Ni and Co) were successfully analysed using a crystallographic model of the hollandite structure, with six oxygen atoms present in the first co-ordination shell at a distance of ca. 2.02Å. Analysis of Fe K-edge EXAFS data of Ba1.2B2.4Ti5.4O16 revealed a reduced co-ordination shell of five oxygens at ca. 1.99Å.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 932: Symposium – Scientific Basis for Nuclear Waste Management XXIX , 2006 , 60.1
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

1. Ringwood, A.E., Kesson, S.E., Reeve, K.D., Levins, D.M., and Ramm, E.J., in “Radioactive Wasteforms For The Future”, Ed. Lutze, W. and Ewing, R.C. (1988).Google Scholar
2. Fillet, C., Advocat, T., Bart, F., Leturcq, G., and Rabiller, H., Comptes Rendus Chimie, 7 (2004) 1165.Google Scholar
3. Post, J.E., Dreele, R.B. von, and Buseck, P.R., Acta Cryst., B38 (1982) 1056.Google Scholar
4. Binsted, N., PAXAS Program for Analysis of X-ray Absorption Apectra, University of Southampton, 1988.Google Scholar
5. Gurman, S.J., Binsted, N., and Ross, I, J. Phys. Chem., 17 (1984) 143;Google Scholar
6. Gurman, S.J., Binsted, N., and Ross, I, J. Phys. Chem., 19 (1989) 1845.Google Scholar
7. Shannon, R.D., Acta Cryst., A32 (1976) 751.Google Scholar
8. Zhang, J. and Burnham, C.W., Am. Miner., 79 (1994) 168.Google Scholar
9. Corker, J.M. and Evans, J., J. Chem. Soc. Chem. Commun., (1994) 1027.Google Scholar
10. Corker, J.M., Evans, J., Leach, H., and Levason, W., J. Chem. Soc. Chem. Commun., (1989) 181.Google Scholar
11. Arcon, I., Mirtic, B., and Kodre, A., J. Am. Ceram. Soc., 81 (1998) 222.Google Scholar
12. Ressler, T., Womg, J., Roos, J., and Smith, I.L., Environ. Sci. Technol., 34 (2000) 950.Google Scholar
13. Wu, G., Zhang, Y., Ribaud, L., Coppens, P., Wilson, C., Iverson, B.B., and Larsen, F.K., Inorg. Chem., 37 (1998) 6078.Google Scholar
14. Waychunas, G.A., Apted, M.J., and Brown, G.E., Phys. Chem. Miner., 10 (1983) 1.Google Scholar
15. Marco, J.F., Grancedo, J.R., Garcia, M., Gautier, J.L., Rios, E., and Berry, F.J., J. Solid State Chem., 153 (2000) 74.Google Scholar
16. Carter, M.L., Vance, E.R., Mitchell, D.R.G., and Zhang, Z., Mat. Res. Symp. Proc., 824 (2004) 249.Google Scholar
17. Cheary, R.W., Acta Cryst., B43 (1987) 28.Google Scholar