Topochemical Synthesis of Plate‐Like Na0.5Bi0.5TiO3 from Aurivillius Precursor
Topochemical Synthesis of Plate‐Like Na0.5Bi0.5TiO3 from Aurivillius Precursor
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DOI：
10.1111/j.1551-2916.2007.02250.x
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发表时间：
2008-04
影响因子：
3.9
通讯作者：
Wei Zhao;Heping Zhou;Yongke Yan;Danian Liu
中科院分区：
文献类型：
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作者：
Wei Zhao;Heping Zhou;Yongke Yan;Danian Liu
在 950°C 的 NaCl 熔盐中，通过拓扑化学微晶转化将层状结构的 Na0.5Bi4.5Ti4O15 (NBIT) 颗粒合成了具有钙钛矿结构的板状 Na0.5Bi0.5TiO3 (NBT) 颗粒。作为NBT的前驱体，板状NBIT颗粒首先由Bi4Ti3O12、Na2CO3和TiO2通过熔盐法反应合成。拓扑化学反应后，层状结构的 NBIT 颗粒转化为钙钛矿 NBT 片晶。厚度约为0.5μm、长度为10-15μm的NBT颗粒保留了前驱体的形貌特征。高纵横比NBT片晶是通过（反应性）模板晶粒生长过程获得织构陶瓷（特别是NBT基陶瓷）的合适模板。
Plate-like Na0.5Bi0.5TiO3 (NBT) particles with perovskite structure were synthesized by topochemical microcrystal conversion from plate-like particles of layer-structured Na0.5Bi4.5Ti4O15 (NBIT) at 950°C in NaCl molten salt. As the precursors of NBT, plate-like NBIT particles were first synthesized by molten salt process by the reaction of Bi4Ti3O12, Na2CO3, and TiO2. After the topochemical reactions, layer-structured NBIT particles were transformed to the perovskite NBT platelets. NBT particles with a thickness of approximately 0.5 μm and a length of 10–15 μm retained the morphology feature of the precursor. High-aspect-ratio NBT platelets are suitable templates to obtain textured ceramics (especially NBT-based ceramics) by (reactive) template grain growth process.