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A Study of Natural Metamict Yttrium Niobate as Analogue of Actinide Ceramic Waste Form

Published online by Cambridge University Press:  01 July 2014

Cao Qiuxiang ,
Anton I. Isakov ,
Liu Xiaodong ,
Sergey V. Krivovichev  and
Boris E. Burakov
Cao Qiuxiang
Affiliation:
East China Institute of Technology, Guanglan Road, 418, 330013, Nanchang, Jiangxi, China Saint-Petersburg State University, Universitetskaya emb. 7/9, 199034, St.-Petersburg, Russia
Anton I. Isakov
Affiliation:
Saint-Petersburg State University, Universitetskaya emb. 7/9, 199034, St.-Petersburg, Russia V.G. Khlopin Radium Institute, 2-nd Murinskiy Ave. 28, 194021, St.-Petersburg, Russia
Liu Xiaodong
Affiliation:
East China Institute of Technology, Guanglan Road, 418, 330013, Nanchang, Jiangxi, China
Sergey V. Krivovichev
Affiliation:
Saint-Petersburg State University, Universitetskaya emb. 7/9, 199034, St.-Petersburg, Russia
Boris E. Burakov
Affiliation:
V.G. Khlopin Radium Institute, 2-nd Murinskiy Ave. 28, 194021, St.-Petersburg, Russia
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Abstract

Natural metamict mineral found as large (1-3 cm in size) homogeneous grains (as assumed, former single crystals), was investigated by X-ray powder diffraction (pXRD), high-temperature pXRD, scanning electron microscopy (SEM) and electron microprobe analysis (EMPA). The average chemical composition obtained by EMPA is (wt. %): Nb2O5 – 42.6; Ta2O5 – 4.4; TiO2 – 9.2; UO3 – 4.4; ThO2 – 1.0; MnO – 1.3; FeO – 19.4; Y2O3 – 16.6.

The untreated (original) sample is X-ray amorphous. The sample remained amorphous after annealing at 400 °C for 1 hour. The sample became almost fully crystalline after annealing at 700 °C for 1 hour with an X-ray diffraction pattern similar to that of Fe-columbite (ICCD: 01-074-7356). Further annealing at 1000 °C and higher temperatures caused changes in the phase composition of the sample. It was proposed that under self-irradiation a single-phase U-Th-bearing solid solution, based on monocrystalline Y-niobate, became metamict but remained homogeneous without evidence of solid solution destruction. However, this metamict solid solution is unstable under thermal treatment and recrystallization.

Keywords

Yceramicwaste management
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1665: Symposium NW – Scientific Basis for Nuclear Waste Management XXXVII , 2014 , pp. 313 - 318
Copyright
Copyright © Materials Research Society 2014 

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References

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