Incorporation of Ba in Al and Fe pollucite

Vance, ER; Gregg, DJ; Griffiths, GJ; Gaugliardo, PR; Grant, C

Incorporation of Ba in Al and Fe pollucite

Date

2016-09-01

Authors

Publisher

Elsevier B.V.

Abstract

Ba, the transmutation product of radioactive Cs, can be incorporated at levels of up to ∼0.07 formula units in Cs(1−2x)BaxAlSi2O6 aluminium pollucite formed by sol-gel methods and sintering at 1400 °C, with more Ba forming BaAl2Si2O8 phases. The effect of Ba substitution in pollucite-structured CsFeSi2O6 was also studied and no evidence of Ba substitution in the pollucite structure via cation vacancies or Fe2+ formation was obtained. The Ba entered a Fe-silicate glass structure. Charge compensation was also attempted with a Cs+ + Fe3+ ↔ Ba2+ + Ni2+ scheme but again the Ba formed a glass and NiO was evident. PCT leaching data showed CsFeSi2O6 to be very leach resistant. © 2016 Elsevier B.V.

Keywords

Barium, Aluminium, Pollucite, Positron annihilation spectroscopy, Iron, Barium, Leaching

Citation

Vance, E. R., Gregg, D. J., Griffiths, G. J., Gaugliardo, P. R., & Grant, C. (2016). Incorporation of Ba in Al and Fe pollucite. Journal of Nuclear Materials, 478, 256-260. doi:10.1016/j.jnucmat.2016.06.025