Phase evolution and aqueous durability of Zr 1-x-y Ce x Nd y O 2-y/2 ceramics designed to immobilize actinides with multi-valences
Phase evolution and aqueous durability of Zr 1-x-y Ce x Nd y O 2-y/2 ceramics designed to immobilize actinides with multi-valences
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DOI：
10.1016/j.jnucmat.2017.02.024
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发表时间：
2017-04
影响因子：
3.1
通讯作者：
Yi Ding;X. Long;S. Peng;Dong Zhang;Zhaoyi Tan;Xirui Lu
中科院分区：
文献类型：
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作者：
Yi Ding;X. Long;S. Peng;Dong Zhang;Zhaoyi Tan;Xirui Lu
采用Ce 4+和Nd 3+同时取代ZrO 2中的Zr 4+的方法，制备了Zr 1 −x− yCexNdyO 2 −y/2陶瓷。系统研究了Ce和Nd同时替代对ZrO 2相变的影响。此外，陶瓷的水耐久性进行了评价。结果表明，同时置换引起的相变主要与Ce和Nd的总量有关。当Ce + Nd含量< 30 mol%时，ZrO 2陶瓷为单斜相和立方相，而当Ce + Nd含量≥ 30 mol%时，陶瓷为立方相。加入30mol%的Ce + Nd可以稳定立方相。此外，由于氧空位的存在，通过引入Ce和Nd，LRi被改性。Nd和Ce共掺杂的氧化锆废物形式表现出优异的水性耐久性（10 - 5g m-2d-1）。
Zr1−x−yCexNdyO2−y/2ceramics, which were designed as waste form materials, were obtained by simultaneous substitution of Ce4+and Nd3+for Zr4+in ZrO2. The influences of the simultaneous substitution of Ce and Nd on phase transformation of ZrO2were investigated systematically. Also, the aqueous durability of the ceramics was evaluated. The results show that the phase transformation caused by the simultaneous substitution mainly relates to the total content of Ce and Nd. The ZrO2ceramics containing Ce + Nd < 30 mol% exhibit both monoclinic and cubic phases, while the ceramics containing Ce + Nd ≥ 30 mol% are cubic phase. And the cubic phase can be stabilized by incorporating 30 mol% Ce + Nd. Moreover, LRiare modified by the incorporation of Ce and Nd, because of the presence of oxygen vacancies. The Nd and Ce co-doped zirconia waste form exhibit excellent aqueous durability (∼10−5g m−2d−1).