Phase composition of brown ceramics of lava-like fuel-containing materials of the object 'Shelter' ChNPP
| Autor: | A.V. Nosovsky, S.O. Chikolovets, I. V. Zhyganiuk, V. G. Kudlai, S. V. Gabielkov, P. E. Parkhomchuk, V.M. Shcherbin |
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| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Materials science crystallization oxidation Lava zirconium Mineralogy inclusions of uranium oxide lcsh:Atomic physics. Constitution and properties of matter Object (computer science) compression silicon oxides lcsh:QC170-197 brown ceramics x-ray phase analysis phase composition silicates of uranium and calcium lava-like fuel-containing materials aluminum visual_art Phase composition visual_art.visual_art_medium inclusions of zirconium oxides Ceramic |
| Zdroj: | Âderna Fìzika ta Energetika, Vol 19, Iss 4, Pp 388-396 (2019) |
| ISSN: | 2074-0565 1818-331X |
| DOI: | 10.15407/jnpae2019.04.388 |
| Popis: | Using the X-ray diffraction method, the phase content of brown ceramics of lava-like fuel-containing materials of the “New Safe Confinement – Shelter Object” Complex was investigated. Their type was identified and crystalline phase composition was estimated. Characterization of the silicate glass phase was also carried out. Uranium oxide is a derivative of “initial” reactor materials before the Chornobyl accident, cubic and tetragonal zirconium oxide and silicate zirconium were produced during the accident, and some silicium oxides, uranium, aluminum, and calcium silicates were formed during the glass matrix crystallization in the course of 33 years after the accident. Uranium oxide in the inclusions oxidized to UO2.34, it has cubic lattice, which is metastable under such oxygen content. These inclusions exist due to their compaction in the glass matrix. Their increased volume, due to oxidation of uranium oxide, is the cause of cracks in the material. Under degradation of brown ceramics, 20 - 25 % of uranium oxide from inclusions transfer into U3O8 oxide with grain degradation to micron and submicron levels. Currently, the crystallization of the glass matrix is at the stable development stage. A range of silicium oxides and uranium, aluminum and calcium silicates were formed during crystallization. There are typical and non-typical phases in the viewpoint of crystallization of industrial silicate glass. |
| Databáze: | OpenAIRE |
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