Glass-ceramic nuclear waste forms obtained from SiO2-Al2O3-CaO-ZrO2-TiO2 glasses containing lanthanides (Ce, Nd, Eu, Gd, Yb) and actinides (Th):: study of internal crystallization
Glass-ceramic nuclear waste forms obtained from SiO2-Al2O3-CaO-ZrO2-TiO2 glasses containing lanthanides (Ce, Nd, Eu, Gd, Yb) and actinides (Th):: study of internal crystallization
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DOI：
10.1016/j.jnucmat.2004.05.020
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发表时间：
2004-10-01
影响因子：
3.1
通讯作者：
Fillet, C
中科院分区：
文献类型：
--
作者：
Loiseau, P;Caurant, D;Fillet, C
玻璃陶瓷废物形式，如锆英石（名义上CaZrTi 2 O 7）为基础的，可以设想作为良好的候选人，为次要锕系元素或钚固定。这种材料，其中锕系元素（或用作锕系元素替代物的镧系元素）将优先结合到均匀分散在耐用玻璃基质中的锆英石晶体中，可以通过属于SiO2-Al 2 O3-CaO-ZrO 2-TiO 2系统的母体玻璃的受控结晶（成核+晶体生长）来制备。在这项工作中，我们提出的影响的性质的次要锕系元素的替代品（Ce，Nd，Eu，Gd，Yb，Th）的结构，显微结构和组成的锆英石晶体中形成的大块的玻璃陶瓷。镧系元素和钍纳入锆英石晶体的量进行了讨论，在与玻璃的能力，以容纳这些元素和晶体，将它们纳入其结构的钙和锆网站。(C)2004 Elsevier B. V.保留所有权利。
Glass-ceramic waste forms such as zirconolite (nominally CaZrTi2O7) based ones can be envisaged as good candidates for minor actinides or Pu immobilization. Such materials, in which the actinides (or lanthanides used as actinide surrogates) would be preferentially incorporated into zirconolite crystals homogeneously dispersed in a durable glassy matrix, can be prepared by controlled crystallization (nucleation + crystal growth) of parent glasses belonging to the SiO2-Al2O3-CaO-ZrO2-TiO2 system. In this work we present the effects of the nature of the minor actinide surrogate (Ce, Nd, Eu, Gd, Yb, Th) on the structure, the microstructure and the composition of the zirconolite crystals formed in the bulk of the glass-ceramics. The amount of lanthanides and thorium incorporated into zirconolite crystals is discussed in relation with the capacity of the glass to accommodate these elements and of the crystals to incorporate them in the calcium and zirconium sites of their structure. (C) 2004 Elsevier B.V. All rights reserved.