基陶固化产品的制备和密度功能理论研究,用于Sr固定
Yan Wu1, Hongji Sang1, Jiawei Zheng1
1School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Toxics
|October 27, 2023
概括
这项研究开发了使用亚洛用于放射性废物处理的固化陶产品. 含有Sr2Al2SiO7和SrAl2Si2O8的陶提供稳定的固定和环境保护.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 核化学 核化学 核化学
背景情况:
- 放射性由于在核废物中常见存在,造成了重大环境风险.
- 有效的处置方法对于防止释放造成生态系统损害至关重要.
- ,一种天然矿物质,被探索为放射性废物固定化的基材.
研究的目的:
- 开发稳定的陶产品,用于最终处理放射性.
- 为了研究艾洛芬作为固化的基质的有效性.
- 分析含相的结构特征和稳定性.
主要方法:
- 采用冷压和烧结技术来制备陶制品.
- 微观形态学和能量分散光谱学用于样本分析.
- 密度函数理论 (DFT) 用于结构稳定的量子化学计算.
主要成果:
- 成功合成了各种晶体结构的陶固化产品.
- (Sr) 在固化产品中均分布.
- 确定了稳定的固化阶段Sr2Al2SiO7和SrAl2Si2O8.
- 根据DFT的计算,Sr2Al2SiO7具有比SrAl2Si2O8.8更高的抗变形能力.
- 由于CaO杂质,推断出一个潜在的混合晶体结构 (Ca2-xSrxAl2SiO7).
结论:
- 基陶有效地固化放射性,形成稳定的矿物阶段.
- 对于固定,Sr2Al2SiO7的结构稳定性比SrAl2Si2O8的结构稳定性更高.
- 这些发现支持在安全的放射性废物管理中使用亚洛陶.
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