Room Temperature Magnetoelectric Coupling in Bi5Ti3FeO15 Ceramics
Room Temperature Magnetoelectric Coupling in Bi5Ti3FeO15 Ceramics
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DOI：
10.4028/www.scientific.net/amr.668.762
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
Xiaoqin Chen;Xiangbin Zeng;F. J. Yang;X. P. Kong;C. Wei;P. Su
中科院分区：
文献类型：
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作者：
Xiaoqin Chen;Xiangbin Zeng;F. J. Yang;X. P. Kong;C. Wei;P. Su
观察了传统固相反应法制备的四层钙钛矿 Bi5Ti3FeO15(BTFO) 陶瓷在室温 (RT) 下的磁电 (ME) 耦合。在58 kV/cm外加电场下，得到了2Pr=0.464 μC/cm2和2Ec=25 kV/cm的不饱和铁电磁滞回线，因为击穿电压较低，这可能是由于样品相对密度较低引起的。通过磁性测量在室温下观察到弱铁磁性（Mr=0.122 memu/g，Hc=69 Oe）而不是反铁磁性。值得注意的是，通过分别测量磁和直流极化对铁电和磁滞回线的影响，证明了室温下电偶极子和磁偶极子之间的 ME 耦合。磁极化和直流极化后Pr和Mr均下降。并且Pr变化率随着测量电场的增大而减小。
Magnetoelectric(ME) coupling at room temperature(RT) in four-layered perovskite Bi5Ti3FeO15(BTFO) ceramics prepared by conventional solid state reaction method was observed. Unsaturated ferroelectric hysteresis loop with 2Pr=0.464 μC/cm2 and 2Ec=25 kV/cm at an applied electric field 58 kV/cm was obtained because of lower breakdown voltage which maybe induced by lower relative density of the sample. A weak ferromagnetic (Mr=0.122 memu/g, Hc=69 Oe) rather than an antiferromagnetic property was observed at RT by magnetic measurement. Significantly, the ME coupling between the electric dipoles and magnetic dipoles at RT was demonstrated by measuring the effect of magnetic and DC electric poling on ferroelectric and magnetic hysteresis loops, respectively. Both Pr and Mr decreased after magnetic and DC electric poling. And the rate of Pr change decreased with increasing measuring electric field.