采用有机凝胶法制备了Sr0.5Ba0.5Nb2O6(SBN50)铁电薄膜. 研究了pH值和EDTA的用量对Sr-Ba-Nb前驱体溶液稳定性的影响，并对不同pH值条件下获得的Sr-Ba-Nb干凝胶的
热分解历程进行了对比. 计算和实验结果表明, 制备Sr-Ba-Nb前驱体溶液的最佳pH=8, EDTA: 金属离子(摩尔比)=2:1. 在700℃下退火30min所得SBN50薄膜为单一钨青铜结构多晶薄
膜. 室温下, 测试频率1kHz时, 薄膜的介电常数为221, 介电损耗为0.02, 剩余极化强度Pr=8.17μ/cm2, 矫顽场Ec=16.9kV/cm.
Sr0.5Ba0.5Nb2O6 (SBN50) thin films were prepared by the organic gel method. The microstructural variation of the gel powders and SBN thin films with annealing temperature was
studied by differential thermal analysis (DTA), thermogravimetry (TG), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD). The differences in the decomposition between Sr-Ba-Nb nitrate precursor
solutions with different pH values were investigated. By annealing at 700℃ for 2h, polycrystalline SBN thin films with smooth and crack-free surface were derived from the precursor solution with
pH=8. Electric properties measurement indicated that the SBN films demonstrated a ferroelectric hysteresis loop. The remanent polarization(Pr) and coercive field (Ec) were 8.17μC/cm2
and 16.9kV/cm, respectively.
参考文献
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