Structure and phase transition of BiFeO3 cubic micro-particles prepared by hydrothermal method

Structure and phase transition of BiFeO3 cubic micro-particles prepared by hydrothermal method
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水热法制备BiFeO3立方微粒的结构与相变

DOI:
10.1016/j.materresbull.2012.06.050
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发表时间:
2012-11
影响因子:
5.4
通讯作者:
Deng C.-Y.
Deng C.-Y.
中科院分区:
材料科学2区
文献类型:
--
作者:
Yang R.-L.;Xiao R.-J.;Chen X.-M.;Deng C.-Y.

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通过严格控制实验条件,采用水热法制备了单相铋铁氧体(BiFeO3)粉体。采用x射线衍射(XRD)、扫描电镜、透射电镜、拉曼测量和x射线光电子能谱对粉末的结构、形貌和成分进行了表征。随着KOH浓度的增加,颗粒由不规则的团块变为规则的立方体。大的bifeo3立方粒子表面光滑,元素比(Bi:Fe:O=1:1:3)和化学价(Bi3+, Fe3+和O2−)匹配良好。高温XRD和差示扫描量热分析表明,bifeo3粉体在370℃以下具有空间基R3c的六方钙钛矿结构,在755℃以下具有空间基R3m的菱形结构。bifeo3在755 ~ 817℃的温度范围内由菱形体结构转变为立方相,在939℃以上分解为液体和fe2o3。
Single-phase bismuth ferrite (BiFeO3) powders were synthesized with a hydrothermal method by controlling the experimental conditions carefully. The powder structure, morphology and composition were characterized by using X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscope, Raman measurement and X-ray photoelectron spectroscopy. The particles change from irregular agglomerations to regular cubes with increasing KOH concentration. The large BiFeO3cubic particles enjoy much smooth surfaces with well-matched element ratio (Bi:Fe:O=1:1:3) and chemical valence (Bi3+, Fe3+and O2−). The high temperature XRD and differential scanning calorimetry show that BiFeO3powders have a hexagonal perovskite structure with a space group R3c below 370°C and a rhombohedral structure with a space group R3m below 755°C. BiFeO3undergoes a phase transition in the temperature range of 755–817°C from rhombohedral structure to a cubic phase, then decomposes to liquid and Fe2O3above 939°C.
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