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Alpha-Decay Damage in Murataite-Based Ceramics

Published online by Cambridge University Press:  01 February 2011

S.V. Stefanovsky ,
A.N. Lukinykh ,
S.V. Tomilin ,
A.A. Lizin  and
S.V. Yudintsev
S.V. Stefanovsky
Affiliation:
Centre of Advanced Technologies, SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 Russia
A.N. Lukinykh
Affiliation:
Research Institute of Atomic Reactors, Dimitrovgrad-10 433510 Russia
S.V. Tomilin
Affiliation:
Research Institute of Atomic Reactors, Dimitrovgrad-10 433510 Russia
A.A. Lizin
Affiliation:
Research Institute of Atomic Reactors, Dimitrovgrad-10 433510 Russia
S.V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits, Staromonetniy lane 35, Moscow 119017 Russia
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Abstract

Samples of murataite ceramics with the composition (wt.%) 3.8 Al2O3, 10.5 CaO, 54.0 TiO2, 10.6 MnO, 6.0 Fe2O3, 4.6 ZrO2, 8.1 ThO2, 2.4 Cm2O3 (1.8 244Cm) and a specific activity of 5.5×1010 Bq/g were prepared by cold pressing and sintering at 1250 °C for 24 hrs or by melting and recrystallisation in a resistive furnace at 1325 °C and 1350 °C for 1 hr. In the sintered ceramics murataite polytypes with five-fold (5C) or three-fold (3C) repeats of the fluorite unit cell and crichtonite were found to be the major phases. Perovskite, pseudobrookite, and pyrochlore were observed as minor phases. The 5C polytype was rendered X-ray amorphous at a cumulative dose of 2.73×1018 μ–decays/g (0.21 dpa) whilst the 3C polytype, which contained only traces of Cm, remains crystalline at this dose. In the melted ceramics the 5C and 8C murataite polytypes were found to be the major phases (80–90 % of the bulk) and minor amounts of rutile, crichtonite and perovskite were also observed. Complete amorphization of the murataite polytypes in the ceramics melted at 1325 and 1350 °C was achieved at doses of 2.46×1018 μ-decays/g (0.19 dpa) and 2.53×1018 μ-decays/g (0.20 dpa), respectively.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 389
Copyright
Copyright © Materials Research Society 2008

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References

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