Fine-Grained Tungstates SrWO4 and NaNd(WO4)2 with the Scheelite Structure Prepared by Spark Plasma Sintering

Fine-grained SrWO 4 and NaNd(WO 4 ) 2 ceramics with the scheelite structure having high relative densities (99 and 95.8%), which can appear candidate matrices for radioactive waste (RAW) management, are prepared by spark plasma sintering (SPS). The phase identity of the ceramics is determined by X-r...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2019-03, Vol.64 (3), p.296-302
Main Authors: Potanina, E. A., Orlova, A. I., Nokhrin, A. V., Mikhailov, D. A., Boldin, M. S., Sakharov, N. V., Belkin, O. A., Lantsev, E. A., Tokarev, M. G., Chuvil’deev, V. N.
Format: Article
Language:English
Subjects:
Activation energy
Ceramic powders
Ceramics
Chemistry
Chemistry and Materials Science
Inorganic Chemistry
Photoelectrons
Plasma sintering
Radioactive wastes
Scheelite
Spark plasma sintering
Synthesis and Properties of Inorganic Compounds
Tungstates
X ray powder diffraction
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Summary:Fine-grained SrWO 4 and NaNd(WO 4 ) 2 ceramics with the scheelite structure having high relative densities (99 and 95.8%), which can appear candidate matrices for radioactive waste (RAW) management, are prepared by spark plasma sintering (SPS). The phase identity of the ceramics is determined by X-ray powder diffraction; their microstructure is studied by X-ray photoelectron spectroscopy. The tungstates under study are sintered at rather low temperatures (580–665°C). The intensity of compaction of the tungstates at the early sintering stage is determined by the degree of powder agglomeration. The activation energy of fine-grained scheelite ceramics at high temperatures corresponds with the activation energy of grain-boundary oxygen diffusion.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023619030161