Growth of BiFeO3 thin films by chemical solution deposition: the role of electrodes.
Growth of BiFeO3 thin films by chemical solution deposition: the role of electrodes.
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DOI：
10.1039/c7cp01842h
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
M. Tomczyk;D. Stroppa;I. Reaney;P. Vilarinho
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文献类型：
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作者：
M. Tomczyk;D. Stroppa;I. Reaney;P. Vilarinho
BiFeO3（BFO）薄膜生长的范围内的电极上的化学溶液沉积，以确定其在控制薄膜的相形成和微观结构的作用。氧化物电极上的晶化过程遵循非晶→ Bi_2O_2（CO_3）→钙钛矿的顺序，而Pt电极上的晶化过程则是直接从非晶相晶化。IrO2电极促进钙钛矿相形成在最低温度和LaNiO3另外诱导局部外延生长。所有的组合物表现出完全连贯的富铁沉淀物内的晶粒内部的钙钛矿基质，而不连贯的Bi2Fe4O9第二相也观察到在晶界上生长的BFO的Pt电极。后者可以通过X射线衍射以及透射电子显微镜（TEM）观察到，但仅通过TEM观察到相干沉淀物，主要通过其在环形暗场图像中的Z对比度来证明。这些数据对于在用于致动器、传感器和存储器应用的施加场下BFO膜的扩展使用具有显著的后果。
BiFeO3 (BFO) thin films were grown by chemical solution deposition on a range of electrodes to determine their role in controlling the phase formation and microstructure of the films. The crystallization on oxide electrodes followed the sequence: amorphous → Bi2O2(CO3) → perovskite, while those on Pt crystallized directly from the amorphous phase. IrO2 electrodes promoted perovskite phase formation at the lowest temperature and LaNiO3 additionally induced local epitaxial growth. All compositions exhibited fully coherent Fe-rich precipitates within the grain interior of the perovskite matrix, whereas the incoherent Bi2Fe4O9 second phase was also observed at the grain boundaries of BFO grown on Pt electrodes. The latter could be observed by X-ray diffraction as well as transmission electron microscopy (TEM) but coherent precipitates were only observed by TEM, principally evidenced by their Z contrast in annular dark field images. These data have pronounced consequences for the extended use of BFO films under an applied field for actuator, sensor and memory applications.