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Alpha-Decay Effects in 241Am-Doped Gadolinium Zirconate

Published online by Cambridge University Press:  16 May 2012

S.V. Stefanovsky ,
A.G. Ptashkin ,
S.V. Yudintsev  and
B.F. Myasoedov
S.V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 Russia, [email protected] Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31, Moscow 119071 Russia
A.G. Ptashkin
Affiliation:
SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121 Russia, [email protected]
S.V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, Staromonetny 35, Moscow 119117 Russia
B.F. Myasoedov
Affiliation:
Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskii av. 31, Moscow 119071 Russia
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Abstract

Sample of zirconate ceramic with a composition corresponding to formula Gd1.7241Am0.3Zr2O7 was synthesized by heat-treatment of mechanically activated and compacted in pellet oxide mixture at 1500 °C for 30 min. The d values on XRD pattern of the sample soon after synthesis (D = 7.9×1015 α-decays/g or 0.001 dpa) demonstrated fluorite structure with the most intensive peak with d111 =3.042 Å (a = 5.269 Å) and very weak diffuse reflections due to d-pyrochlore. At a dose of 7.9×1017 α-decays/g or 0.11 dpa the reflections were broadened by approximately 20% and their relative intensity slightly reduced. At higher doses all the weak superstructure reflections disappeared and the growth in intensity and narrowing of the main reflection occurred. Lattice parameter a increased with the dose and reached 5.343 Å (d111 = 3.085 Å) at a dose of 4.6×1018 α-decays/g or 0.42 dpa. At a dose of 5.5×1018 α-decays/g or 0.78 dpa positions of reflections were shifted to lower d-spaces (d111 value reduced to 3.071 Å) and the half-width of the major reflection was 67% of initial. For the 241Am-doped Gd-zirconate the structure recovery rate exceeds disordering rate and no amorphization occurred at doses higher than ∼0.2-0.3 dpa.

Keywords

actinideceramicx-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1444: Symposium S/Y – Actinides and Nuclear Energy Materials , 2012 , mrss12-1444-y10-20
Copyright
Copyright © Materials Research Society 2012

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