Pressure-induced phase transitions of multiferroic BiFeO3

Pressure-induced phase transitions of multiferroic BiFeO3
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多铁性 BiFeO3 的压力诱导相变

DOI:
10.1088/1674-1137/37/12/128001
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发表时间:
2013-08
期刊:
影响因子:
3.6
通讯作者:
陈栋梁
陈栋梁
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
陈栋梁

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多铁性 BiFeO3 的压力诱导相变已在室温下使用同步辐射 X 射线衍射和金刚石砧池技术进行了研究。目前的实验数据清楚地表明,BiFeO3 的菱形 (R3c) 相首先在 7 GPa 下转变为单斜 (C2/m) 相,然后在 11 GPa 下转变为斜方 (Prima) 相,这与最近的理论从头计算相一致。然而,我们在 5-7 GPa 压力范围内观察到 2 theta=7 度处的另一个峰值,这是以前未报道过的。进一步分析表明,该反射峰归因于斜方晶系(Pbam)相,表明在低压范围内单斜晶相与斜方晶相共存。
Pressure-induced phase transitions of multiferroic BiFeO3 have been investigated using synchrotron radiation X-ray diffraction with diamond anvil cell technique at room temperature. Present experimental data clearly show that rhombohedral (R3c) phase of BiFeO3 first transforms to monoclinic (C2/m) phase at 7 GPa, then to orthorhombic (Prima) phase at 11 GPa, which is consistent with recent theoretical ab initio calculation. However, we observe another peak at 2 theta=7 degrees in the pressure range of 5-7 GPa that has not been reported previously. Further analysis reveals that this reflection peak is attributed to the orthorhombic (Pbam) phase, indicating the coexistance of monoclinic phase with orthorhombic phase in low pressure range.
DOI: 10.1107/s0567740872007976
发表时间: 1972-01-01
期刊: ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE
影响因子: --
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