Structural Properties of Multiferroic BiFeO3 under Hydrostatic Pressure
Structural Properties of Multiferroic BiFeO3 under Hydrostatic Pressure
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DOI：
10.1021/cm901008t
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发表时间：
2009-06
影响因子：
8.6
通讯作者：
A. Belik;H. Yusa;N. Hirao;Y. Ohishi;E. Takayama-Muromachi
中科院分区：
文献类型：
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作者：
A. Belik;H. Yusa;N. Hirao;Y. Ohishi;E. Takayama-Muromachi
通过在室温高达 9.7 GPa 的高分辨率同步加速器 X 射线粉末衍射研究了多铁性钙钛矿型 BiFeO3 的高压结构特性。 BiFeO3 显示出相当复杂的结构行为。在压缩过程中，环境压力铁电 R3c 相在 4 GPa 左右转变为斜方相 OI。 OI相的特征在于上层结构√2ap × 3√2ap × ap，其中ap是立方钙钛矿子晶胞的参数（4.9 GPa下a = 5.4939(4) A，b = 16.6896(9) A，c = 3.8728(2) A）。 OI 相在 7 GPa 左右转变为斜方相 OII。 OII 相的特征是上部结构 √2ap × 3√2ap × 2ap（9.7 GPa 下 a = 5.5021(3) A、b = 16.2439(11) A、c = 7.6960(4) A）。在减压过程中，发现了明显的迟滞行为。 OII 相稳定低至约 3 GPa。然后 OII 相转变为斜方相 OIII，其上层结构为 √2ap × 2√2ap × 2ap (a = 5.5617(6) A, b = 11.215...
High-pressure structural properties of multiferroic perovskite-type BiFeO3 have been investigated by high-resolution synchrotron X-ray powder diffraction at room temperature up to 9.7 GPa. BiFeO3 shows rather complicated structural behavior. The ambient-pressure ferroelectric R3c phase transforms to an orthorhombic phase OI at around 4 GPa during compression. The OI phase is characterized by a superstructure √2ap × 3√2ap × ap, where ap is the parameter of the cubic perovskite subcell (a = 5.4939(4) A, b = 16.6896(9) A, c = 3.8728(2) A at 4.9 GPa). The OI phase transforms to an orthorhombic phase OII at around 7 GPa. The OII phase is characterized by a superstructure √2ap × 3√2ap × 2ap (a = 5.5021(3) A, b = 16.2439(11) A, c = 7.6960(4) A at 9.7 GPa). During decompression, significant hysteretic behavior was found. The OII phase was stable down to about 3 GPa. The OII phase then transforms to an orthorhombic phase OIII that is characterized by a superstructure √2ap × 2√2ap × 2ap (a = 5.5617(6) A, b = 11.215...