Alpha self-irradiation effects in ternary oxides of actinides elements: The zircon-like phases AmIIIVO4 and AIINpIV(VO4)2 (A=Sr, Pb)

Goubard, Fabrice; Griesmar, Pascal; Tabuteau, A.

doi:10.1016/j.jssc.2005.03.039

Cited by 16 publications

(25 citation statements)

References 28 publications

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“…391 With the same objective, samples of (La,Am)PO 4 with 23 wt.% 243 Am were prepared. 179,180 Goubard et al 392 reports the experimental studies by X-ray diffraction of irradiation damage from alpha decay in neptunium and americium vanadates versus cumulative dose. The isotopes used were the 237 Np ␣-emitter and the 241 Am ␣, ␥-emitter.…”

Section: Effect Of Irradiation On the Monazite Structurementioning

confidence: 99%

Crystal chemistry of the monazite structure

Clavier

Podor

Dacheux

2011

Journal of the European Ceramic Society

344

243

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Section: Effect Of Irradiation On the Monazite Structurementioning

confidence: 99%

Crystal chemistry of the monazite structure

Clavier

Podor

Dacheux

2011

Journal of the European Ceramic Society

344

243

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“…11 In addition to the trivalent rare-earth ion vanadates, mixed cation vanadates with tetravalent cation, namely, Th 4+ , Am 4+ , and Np 4+ or Pu 4+ , with appropriate divalent cations have been reported in literature. [12][13][14][15] Such vanadates of actinides exhibit polymorphic behavior, where the scheelite, monazite, and zircon-type structures are reported depending on the composition and preparation temperature. 12,14,15 Most of the mixed cation phosphates crystallize in low symmetric monoclinic monazite or hexagonal NaZr 2 (PO 4 ) 3 -related lattices.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure, electrical, and thermal properties of Ca_0.5Th_0.5VO₄

2009

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Ca 0.5 Th 0.5 VO 4 was prepared by a solid-state reaction of component oxides and characterized by powder x-ray diffraction (XRD) at ambient and higher temperatures and impedance spectroscopy. Crystal structure was refined by Rietveld refinements from powder XRD data. At room temperature, Ca 0.5 Th 0.5 VO 4 has a zircon-type tetragonal (I4 1 /amd) lattice with unit cell parameters: a = 7.2650(1) and c = 6.4460(1) Å . Despite the large charge difference, Ca 2+ and Th 4+ are statistically distributed over a single site. The crystal structure of Ca 0.5 Th 0.5 VO 4 is built from the (Ca/Th)O 8 (bisdisphenoid) and VO 4 tetrahedra. The in situ high-temperature XRD studies on Ca 0.5 Th 0.5 VO 4 revealed anisotropic thermal expansion behavior with coefficients of thermal expansion a c = 10.96 Â 10 À6 / C and a a = 5.32 Â 10 À6 / C. The impedance measurements carried out in the temperature range from ambient to 800 C indicate semiconducting behavior with appreciable ionic conductivity above 400 C. The activation energy obtained from the temperature-dependent AC conductivity data is $1.37 eV. In wider range of frequencies and temperatures, the relative permittivity of approximately 50 to 60 is observed for Ca 0.5 Th 0.5 VO 4 .

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“…EXAFS studies of metamict natural minerals [15] and 238 Pu doped waste forms such as zirconolite [16] and zircon [17] show a loss of long range order with accumulation of self-irradiation, whereas the nearest-neighbour coordination shell remains less affected. Despite Am being a major a-decay source of high level waste generated from reprocessing, less information is available for Am bearing phases [18].…”

Section: Introductionmentioning

confidence: 99%