Preparation of Y2Ti2O7 pyrochlore glass-ceramics as potential waste forms for actinides: The effects of processing conditions

Glass-Y2Ti2O7 pyrochlore was fabricated by sintering the mixture of glass precursor powder and (YTi)-composite which was prepared by a soft chemistry route. X-ray diffraction and Raman spectroscopy confirmed that the phase pure pyrochlore was crystallized in-situ in amorphous glass matrix at 1200 °C...

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Bibliographic Details
Published in:Journal of nuclear materials 2017-10, Vol.494, p.29-36
Main Authors: Kong, Linggen, Zhang, Yingjie, Karatchevtseva, Inna
Format: Article
Language:English
Subjects:
Actinides
Chemical elements
Cooling rate
Crystallization
Electron microscopy
Glass ceramics
Glass-ceramic
Immobilization
Impurities
Particulate composites
Powder
Pyrochlore
Raman spectroscopy
Scanning electron microscopy
Sintering
Sintering (powder metallurgy)
Spectroscopy
Studies
Waste form
Y2Ti2O7
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Summary:Glass-Y2Ti2O7 pyrochlore was fabricated by sintering the mixture of glass precursor powder and (YTi)-composite which was prepared by a soft chemistry route. X-ray diffraction and Raman spectroscopy confirmed that the phase pure pyrochlore was crystallized in-situ in amorphous glass matrix at 1200 °C with dwelling time over 1 h. Pyrochlore was formed in glass matrix with cooling rate ∼0.1–40 °C/min, and independent of addition of alkali/alkaline earth fluorides. Glass matrix was able to accommodate/dissolve small amounts of impurities and the mean pyrochlore particle size was between 1 and 2 μm in glass observed by scanning electron microscopy. [Display omitted] •Preparation of Y2Ti2O7 pyrochlore glass-ceramics.•The phase pure pyrochlore particles (1–2 μm) internally crystallized in glass.•Pyrochlore formation and processing conditions investigated.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2017.07.004