Synthesis of nanosized β-BiTaO4 by the polymeric precursor method
Synthesis of nanosized β-BiTaO4 by the polymeric precursor method
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DOI：
10.1016/j.matlet.2010.02.020
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发表时间：
2010-05
影响因子：
3
通讯作者：
Cristiane Gomes Almeida;H. Andrade;A. Mascarenhas;L. A. Silva
中科院分区：
文献类型：
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作者：
Cristiane Gomes Almeida;H. Andrade;A. Mascarenhas;L. A. Silva
以柠檬酸铋和TaCl 5为原料，采用柠檬酸盐法合成了β-BiTaO 4粉体。通过热分析（TG和DTA）表征柠檬酸盐凝胶，以确定最佳聚合温度。聚合物前体基本上是无定形的，并且在400°C下煅烧后，与Bi 3 NbO 7和Bi 5 Nb 3 O 15同晶的钽酸盐的混合物开始结晶。在600°C下，除了这些相之外，还可以观察到与β-BiTaO 4相关的一些峰。最后，在800°C下，β-BiTaO 4为纯相，粒径约为47 nm。前驱体聚合方法允许在显著低于固态反应方法的温度下获得β-BiTaO 4纯相。
β-BiTaO4powder was synthesized by the citrate method, using bismuth citrate and TaCl5as precursors. The citrate gel was characterized by thermal analyses (TG and DTA), in order to determine the best polymerization temperature. The polymeric precursor is essentially amorphous and after calcination at 400°C a mixture of tantalates, that are isomorphic to Bi3NbO7and Bi5Nb3O15, starts to crystallize. At 600°C, in addition to those phases, one could observe some peaks related to β-BiTaO4. Finally, at 800°C β-BiTaO4can be observed as a pure phase, with particle size estimated as 47nm. The precursor polymeric method allowed obtaining β-BiTaO4pure phase at temperatures significantly lower than those found for solid state reaction method.