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

被引：0
|
作者：
E. A. Potanina
A. I. Orlova
A. V. Nokhrin
D. A. Mikhailov
M. S. Boldin
N. V. Sakharov
O. A. Belkin
E. A. Lantsev
M. G. Tokarev
V. N. Chuvil’deev
机构：
[1] Nizhny Novgorod National Research University,
来源：
Russian Journal of Inorganic Chemistry | 2019年 / 64卷
关键词：
ceramics; density; diffusion; activation energy; spark plasma sintering;
D O I：
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学科分类号：
摘要：
Fine-grained SrWO4 and NaNd(WO4)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.
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页码：296 / 302
页数：6
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