Large-scale growth and shape evolution of bismuth ferrite particles with a hydrothermal method
Large-scale growth and shape evolution of bismuth ferrite particles with a hydrothermal method
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水热法铁酸铋颗粒的大规模生长和形状演化
DOI：
10.1016/j.matchemphys.2011.01.027
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发表时间：
2011-04-15
影响因子：
4.6
通讯作者：
Liu, Peng
中科院分区：
文献类型：
--
作者：
Chen, Xian-Zhi;Qiu, Zhong-Cheng;Liu, Peng
采用水热法在一系列实验条件下合成了大尺寸多面体铁酸铋（BiFeO3）颗粒。X射线衍射分析表明，BiFeO3粉体具有钙钛矿结构。扫描电子显微镜观察结果表明，BiFeO3颗粒的形貌为球形、八面体、截顶八面体、立方八面体和截顶立方体。实验结果表明，KOH浓度、反应时间、升温速率和降温速率对BiFeO3颗粒的尺寸和形貌有重要影响。详细讨论了大尺寸多面体BiFeO3颗粒的形成机理和变化过程。所制备的BiFeO3具有铁电性和磁响应性，证实了BiFeO3晶化的多铁性。BiFeO3颗粒的光学行为揭示了约2 eV的带隙能量，这是小于由于纳米微晶的BiFeO3块体。(C)2011 Elsevier B.V.保留所有权利。
Large-scale polyhedral bismuth ferrite (BiFeO3) particles were synthesized with a hydrothermal method under a series of experimental conditions. X-ray diffraction revealed that the BiFeO3 powders had a perovskite structure. Scanning electron microscopy images showed different BiFeO3 particles were formed, including sphere, octahedron, truncated octahedron, cubo-octahedron and truncated cube. The experimental results showed that the concentration of KOH, reaction time, heating and cooling rates had important impacts on the size and morphology of the BiFeO3 particles. The formation mechanism and change process of the large-scale polyhedral BiFeO3 particles were discussed in detail. The obtained BiFeO3 showed ferroelectric behavior and magnetic response, which approved the multiferroic property of the BiFeO3 crystallization. The optical behaviors of BiFeO3 particles revealed the band gap energy of about 2 eV, which is smaller than the BiFeO3 bulk due to the nano-crystallites. (C) 2011 Elsevier B.V. All rights reserved.