Mechanochemical synthesis of strontium britholites: Reaction mechanism

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• 作者：Nadia Gmati^a ; Khaled Boughzala^a ; Mohieddine Abdellaoui^b ; Khaled Bouzouita^a ;   ; ^{khaled.bouzouita@ipeim.rnu.tn}
• 关键词：Britholite ; Strontium ; Lanthanum ; Mechanochemical synthesis ; Reaction mechanism
• 刊名：Comptes Rendus Chimie
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：14
• 期：10
• 页码：896-903
• 全文大小：729 K

文摘

The britholites have gained a great interest thanks to their potential applications as matrices for the confinement of the byproducts in the nuclear industry such as minor actinides and long-lived fission products. However, the preparation of britholites requires high temperatures, above 1200 ¡ãC. In this work, we strive to prepare these kinds of compounds by a mechanochemical synthesis at room temperature from the starting materials SrF₂, SrCO₃, Sr₂P₂O₇, La₂O₃ and SiO₂ using a planetary ball mill. The obtained results showed that the prepared products were carbonated apatites and the corresponding powders contained some unreacted silica and lanthana. To obtain pure britholites, a heat-treatment at 1100 ¡ãC was required. The mechanism involved in the different steps of the reaction is discussed in this paper. The obtained results suggest that the use of raw materials containing no carbonate is expected to directly lead to pure britholites by appropriate milling at room temperature.