The Crystallization of Ba-Substituted CsTiSi2O6.5 Pollucite Using CsTiSi2O6.5 Seed Crystals
The Crystallization of Ba-Substituted CsTiSi2O6.5 Pollucite Using CsTiSi2O6.5 Seed Crystals
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使用 CsTiSi2O6.5 晶种结晶 Ba 取代的 CsTiSi2O6.5 铯榴石
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
A. Navrotsky
中科院分区：
文献类型：
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作者：
T. Garino;T. Nenoff;T. Park;A. Navrotsky
合成了BaBa1xTiSi2O6.5(7−x/2)和CsxBa1xTiSi2O6.5(1−x)/2TiSi2O6.5两种类型的钙钛矿结构的CsxBa1−xTiSi2O6.5材料。当Ba基前驱体材料在850℃热处理4h时，形成了无定形和无法识别的相的混合物。添加10wt%的晶态CsTiSi2O6.5后，当x≥为0.6时，在750°C下反应20h，可得到几乎为单相的闪锌矿。添加的晶态CsTiSi2O6.5颗粒起到了原子核的作用，使含BA的材料结晶成波利石相，并避免形成原本会形核和长大的不需要的相。这些新材料可以用来研究CsTiSi2O6.5作为一种耐久的陶瓷废料形式的稳定性，它可以随时间同时容纳Cs及其衰变产物Ba。
Barium (Ba)-substituted CsTiSi2O6.5 materials of two types, CsxBa1−xTiSi2O(7−x/2) and CsxBa(1−x)/2TiSi2O6.5 were synthesized with the pollucite structure with 1≥x≥0.6. When the Ba-substituted precursor materials were heat treated to 850°C for 4 h, a mixture of amorphous and unidentifiable phases formed. However, with the addition of 10 wt% of crystalline CsTiSi2O6.5 to the Ba-containing precursors, nearly single-phase pollucite was obtained after 20 h at 750°C for x≥0.6. The added crystalline CsTiSi2O6.5 particles act as nuclei that allow the Ba-containing materials to crystallize into the pollucite phase and to avoid the formation of unwanted phases that would otherwise nucleate and grow. These new materials can be used to study the stability of CsTiSi2O6.5 as a durable ceramic waste form, which could accommodate with time both Cs and its decay product, Ba.