Structural integrity of Cs and Sr immobilized lacunar apatite phosphate simulated ceramic wasteform Na0.9Cs0.1Pb3Sr(PO4)3 under heat and aqueous flow
| Autor: | Ramya Ravikumar, Buvaneswari Gopal |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Nuclear and High Energy Physics
Strontium Materials science Analytical chemistry chemistry.chemical_element Atmospheric temperature range Apatite Thermal expansion Nuclear Energy and Engineering chemistry Elemental analysis visual_art visual_art.visual_art_medium General Materials Science Thermal stability Ceramic Leaching (metallurgy) |
| Zdroj: | Journal of Nuclear Materials. 558:153388 |
| ISSN: | 0022-3115 |
| Popis: | Lacunar apatite host, NaPb4(PO4)3was converted into a ceramic wasteform with the incorporation of Cs and Sr ions. The systematic substitution yielded the wasteform composition Na0.9Cs0.1Pb3Sr(PO4)3 with 8.52 wt% of Strontium and 1.29 wt% of Cesium. The wasteform was subjected to continuous heating in the temperature range 298-973K and aqueous flow to study the thermal stability and chemical durability respectively. The wasteforms response was studied by powder X-Ray diffraction analysis (Room temperature and High temperature), electron microscopic & elemental analysis and normalized mass loss (NLi) & leach rate (LRi) calculations. The average thermal expansion coefficient (αavg) value of 14.4 ± 1.1 × 10−6 K−1 and the leach rates of immobilised Cs, LRCs (10−6 – 10−8 gm−2d−1) and Sr, LRSr (10−3 – 10−4 gm−2d−1) demonstrate the structural integrity of the phase. The anisotropic nature of thermal expansion and the mechanistic feature of leaching are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect