采用化学自组织方法在SrTiO3(100)及Nb-掺杂SrTiO3(100)单品衬底上制备了外延BiFeO3纳米岛,并利用X射线衍射、扣描电子显微镜和原子力显微镜对纳米岛的相结构及形貌进行了表征.结果表明,在650～800℃下后退火1h可获得外延的BiFeO3纳米岛,岛横向尺寸在50～150 nm之间,纵向尺寸在6～12 nm之间.随着纳米岛后退火温度的升高,其(100)面内的几何形貌由三角形状转向四边形状,然后再趋向于长棒状.利用压电力显微镜,对单个BiFeO3纳米岛(横向尺寸～50nm,高度12 nm)的铁电特性进行表征.结果表明,单个外延BiFeO3纳米岛内存在分形铁电畴和自偏压极化现象,其中自偏压极化现象来源于外延BiFeO3纳米岛与SrTiO3单品衬底之间的界面应力.
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