Giant magnetodielectric and enhanced multiferroic properties of Sm doped bismuth ferrite nanoparticles
Giant magnetodielectric and enhanced multiferroic properties of Sm doped bismuth ferrite nanoparticles
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DOI：
10.1039/c4tc00591k
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发表时间：
2014-01-01
影响因子：
6.4
通讯作者：
Pal, Mrinal
中科院分区：
文献类型：
--
作者：
Mukherjee, Ayan;Basu, Soumen;Pal, Mrinal
磁介电和多铁性的改善是必不可少的可视化的真实的应用的多铁性，准确地说，BiFeO 3（BFO）。通过Sm掺杂，化学制备的纳米晶BFO的多铁性和磁介电性能得到了增强。X射线衍射研究证实了单相纳米晶BFO的生长，这证实了TEM观察。磁性研究描绘了纳米晶Sm掺杂的BFO样品的铁磁行为，即使在室温下，这是不存在的原始样品。令人惊讶的是，在Sm掺杂样品中观察到电阻率的几个数量级的增加。室温铁电测量表明Sm掺杂显著提高了材料的极化。此外，我们还实现了Sm掺杂样品的磁介电性质的巨大变化，这是迄今为止尚未报道的。由于离子半径的失配和氧空位的减少而产生的大的晶格应变可能在纳米晶Sm掺杂BFO的多铁性增强中起重要作用，这是一种有前途的多铁性材料。
Improvements in magnetodielectric and multiferroic properties are essential for visualizing the real application of multiferroics, precisely, BiFeO3 (BFO). An enhancement of multiferroic and magnetodielectric properties has been achieved for chemically prepared nanocrystalline BFO by virtue of Sm doping. The X-ray diffraction study confirms the growth of single phase nanocrystalline BFO which corroborates TEM observation. The magnetic study delineates the ferromagnetic behavior of nanocrystalline Sm-doped BFO samples even at room temperature, which is absent in pristine samples. Surprisingly, a few orders of magnitude increase in resistivity is observed in Sm doped samples. Room temperature ferroelectric measurement showed that Sm doping improves the polarization significantly. In addition, we have achieved a giant change in the magnetodielectric properties of Sm doped samples which has not been reported so far. Large lattice strain arising due to the mismatch of ionic radii and the decrease of oxygen vacancies combined could play an important role in the enhancement of multiferroic properties of nanocrystalline Sm-doped BFO which is a promising multiferroic material.