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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

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