Fine-Grained Tungstates SrWO4 and NaNd(WO4)2 with the Scheelite Structure Prepared by Spark Plasma Sintering
| Autor: | Maksim Boldin, M. G. Tokarev, O. A. Belkin, E. A. Lantsev, A. I. Orlova, D. A. Mikhailov, V. N. Chuvil’deev, A. V. Nokhrin, E. A. Potanina, N. V. Sakharov |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Materials Science (miscellaneous) Analytical chemistry Spark plasma sintering Sintering Activation energy Microstructure Inorganic Chemistry chemistry.chemical_compound X-ray photoelectron spectroscopy chemistry Scheelite visual_art visual_art.visual_art_medium Ceramic Physical and Theoretical Chemistry Powder diffraction |
| Zdroj: | Russian Journal of Inorganic Chemistry. 64:296-302 |
| ISSN: | 1531-8613 0036-0236 |
| DOI: | 10.1134/s0036023619030161 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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