Bi4Ti3O12–5BiFeO3 Aurivillius intergrowth: Structural and ferroelectric properties
Bi4Ti3O12–5BiFeO3 Aurivillius intergrowth: Structural and ferroelectric properties
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DOI：
10.1063/1.3267160
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发表时间：
2009-12
影响因子：
3.2
通讯作者：
K. Meher;K. Varma
中科院分区：
文献类型：
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作者：
K. Meher;K. Varma
Aurivillus intergrowth Bi4Ti3O12-5BiFeO(3)被证明是铁电的，这引发了该化合物家族实现高温磁电特性的可能性。x射线衍射研究证实其结构为正交[Fmm2]；a=5.5061(11) a度，b=5.4857(7) a度，c=65.742(12) a度]。然而，透射电镜确定了n=6和n=7个Aurivillius家族成员在纳米尺度上的共生随机发生率。电介质和高温x射线衍射研究证实了857 K左右的漫射铁电正交向准电四方相变。在300 K下得到了2P(r)为5.2 μ C/cm(2)、矫顽力为42 kV/cm的极化-电场磁滞回线。
Aurivillus intergrowth Bi4Ti3O12-5BiFeO(3) was demonstrated to be ferroelectric that evoked the possibility of achieving high temperature magnetoelectric property in this family of compounds. X-ray diffraction studies confirmed its structure to be orthorhombic [Fmm2; a=5.5061(11) A degrees, b=5.4857(7) A degrees, c=65.742(12) A degrees]. However, transmission electron microscopy established the random incidence of intergrowth at nanoscale corresponding to n=6 and n=7 members of the Aurivillius family. Diffuse ferroelectric orthorhombic to paraelectric tetragonal phase transition around 857 K was confirmed by dielectric and high temperature x-ray diffraction studies. Polarization versus electric field hysteresis loops associated with 2P(r) of 5.2 mu C/cm(2) and coercive field of 42 kV/cm were obtained at 300 K.