EDTA-assisted hydrothermal synthesis and magnetic properties of urchin-like YbMn2O5 microspheres
EDTA-assisted hydrothermal synthesis and magnetic properties of urchin-like YbMn2O5 microspheres
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DOI：
10.1016/j.jallcom.2015.07.101
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发表时间：
2015-11
影响因子：
6.2
通讯作者：
Yunhao Liu;Songping Wu;Rongyun Ge
中科院分区：
文献类型：
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作者：
Yunhao Liu;Songping Wu;Rongyun Ge
采用乙二胺四乙酸(EDTA)辅助水热法制备了海胆状YbMn2O5微球。结果表明，EDTA对海胆状YbMn2O5微球的生长起着关键作用。磁性测量表明，YbMn2O5由于表面自旋补偿不完全，在低温下表现出较弱的铁磁性。场冷却曲线和零场冷却曲线之间的漂移可以合理地归因于自旋玻璃行为和Yb3+磁矩的反铁磁(AFM)有序的共同作用。在YbMn2O5微球和纳米棒(不含EDTA)中都可以观察到交换偏置(磁滞回线向负轴移动)。随着颗粒尺寸的增大，交换偏置场和矫顽力增大。
Urchin-like YbMn2O5microspheres have been fabricated by EDTA (ethylene diamine tetra acetic acid)-assisted hydrothermal method. The results demonstrated that EDTA played key roles in growth of urchin-like YbMn2O5microspheres. Magnetic measurement indicated that YbMn2O5showed a weak ferromagnetic at low temperature due to incomplete spin compensation on the surface. The divagation between field cooling and zero field cooling curves could be reasonably ascribed to the collaboration result of spin-glass behavior and the antiferromagnetic (AFM) ordering of the Yb3+magnetic moments. Exchange bias (a shift in the hysteresis loop toward negative axis) could be observed in both YbMn2O5microspheres and nanorods (without EDTA). With the increasing particle size, the exchange bias field and the coercivity increased.