Reorientation of (MnTi″−VO••)× defect dipoles in acceptor-modified BaTiO3 single crystals: An electron paramagnetic resonance study
Reorientation of (MnTi″−VO••)× defect dipoles in acceptor-modified BaTiO3 single crystals: An electron paramagnetic resonance study
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DOI：
10.1063/1.3006327
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发表时间：
2008-11
影响因子：
4
通讯作者：
Lixue Zhang;E. Erdem;X. Ren;R. Eichel
中科院分区：
文献类型：
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作者：
Lixue Zhang;E. Erdem;X. Ren;R. Eichel
利用电子顺磁共振（EPR）谱和光学显微镜研究了外加电场对BaTiO 3铁电单晶中（MnTi″−VO··）×缺陷偶极子取向的影响及其与畴结构的相互作用。结果表明，在铁电态时效一定时间的样品中，（MnTi″−VO··）×缺陷偶极子沿着自发极化方向取向，并在相应的高电场极化时发生畴变.极化老化的单畴样品中的EPR信号与自然老化的多畴样品中的EPR信号的比较表明缺陷偶极子的类似的重取向过程，这意味着偶极子重取向需要长时间、热能和高电场，即，更多的能量
The effect of external electric fields on the orientation of (MnTi″−VO••)× defect dipoles in ferroelectric BaTiO3 single crystals and its interplay with the domain structure were investigated by means of electron paramagnetic resonance (EPR) spectroscopy and optical microscopy. The results show that in specimens aged in the ferroelectric state for a defined time, so-termed ferroelectrically aged, the (MnTi″−VO••)× defect dipoles orient along the direction of spontaneous polarization and follow the domain switching upon poling with correspondingly high electric fields. A comparison of the EPR signal in poled aged single-domain samples to that in naturally aged multidomain samples indicates a similar reorientation process of the defect dipole, which means that dipole reorientation rather requires long time, thermal energy, and high electric fields, i.e., more energy.