Can aluminium or magnesium be a surrogate for beryllium: A critical investigation of their chemistry
Can aluminium or magnesium be a surrogate for beryllium: A critical investigation of their chemistry
复制标题
DOI：
10.1016/j.fusengdes.2013.04.040
复制
发表时间：
2013-10
影响因子：
1.7
通讯作者：
L. Marot;C. Linsmeier;B. Eren;L. Moser;R. Steiner;E. Meyer
中科院分区：
文献类型：
--
作者：
L. Marot;C. Linsmeier;B. Eren;L. Moser;R. Steiner;E. Meyer
根据关于热核实验堆中预计将发生的等离子体-壁相互作用的研究，铍的使用仍然是一个存在的问题。预测热核实验堆的侵蚀和共沉积过程对于第一壁的设计和材料选择是必要的。在目前的配置下，预计将形成含有Be、钨和可能还有碳的共沉积层。然而，Be的毒性限制了它在世界各地的许多实验设施中的使用。在实验室实验中使用铝或镁作为Be的替代品，可以解决Be混合材料的毒性和处理问题。自动产生的一个关键问题是，与热核实验堆预期的共沉积层相比，在这两种元素的物理和化学性质方面使用铝或镁是否具有相关性。本文综述了铝和镁的化学和物理性质，并与铍的性质进行了比较。由于铝的电负性与Be相似，所以在化合物的形成方面，特别是氧化物和氢化物的形成方面，Al可以成功地与Be相似。然而，由于成键性质的不同，镁不能取代可能形成的氢化物沉积。
The use of beryllium is still an existing question according to the studies concerning the plasma–wall interactions which are expected to occur in ITER. Prediction of erosion and co-deposition processes for ITER is necessary for the design and the material choice of the first wall. In the current configuration, it is expected that co-deposited layers containing Be, tungsten and possibly carbon will be formed. However, the toxicity of Be limits its use in many experimental facilities around the world. Using aluminium or magnesium as Be replacements in laboratory experiments would solve this problem of toxicity and handling of Be mixed materials. A critical question which automatically arises is the relevance to use Al or Mg regarding the physical and chemical properties of both elements in comparison to the co-deposited layers expected in ITER. This work provides a review of the chemical and physical properties of Al and Mg, in the respect of comparing these properties to those of Be. Thanks to the similarity of its electronegativity to Be, Al can successfully resemble Be in terms of formation of compounds, especially the oxides and possibly the hydrides. However, due to the difference in the nature of the bonding, Mg cannot be a replacement for a possible hydride deposit formation.