钛掺杂对于YMnO_3多铁性能的调控
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摘要
利用固相反应法制备了钛掺杂的YMn_(1–x)Ti_xO_3 (x=0.1,0.2)固溶体,对掺杂前后体系的晶格结构、磁性以及铁电性进行了研究。结果表明:掺杂后的样品仍然维持六角相结构,在x=0.2时开始有菱形■结构出现,掺杂体系保持着原有的铁电与反铁磁共存的状态,并伴随着弱铁磁性的出现;随着掺杂的增加由Curie-Weiss拟合得到的Weiss温度(负值)逐渐升高,表明反铁磁作用在减弱;体系在低温会发生自旋玻璃态转变,同时冻结温度Tf随着掺杂量的增加逐渐降低;对于体系铁电性测量表明其依然保留着原有的铁电性能,且极化强度会随着掺杂浓度的提高而增强。
A solid solution of titanium doped YMn_(1–x)Ti_xO_3(x=0.1, 0.2) was prepared by a solid-state reaction method. The lattice structure, magnetic properties and ferroelectric properties of the doped system were investigated. The results show that the doped sample still maintains a hexagonal phase structure, and a rhombohedral ■ structure appears as x=0.2. YMn_(1–x)Ti_xO_3 has ferroelectric and antiferromagnetic behaviors as a weak ferromagnetic material. The Weiss temperature(negative value) obtained by the Curie-Weiss fitting increases gradually with the increase of doping, indicating that the antiferromagnetism is weakened. Based on the temperature variation curve and relaxation curve, the system has a spin glass transition at a low temperature, and the freezing temperature Tf decreases with the increase of doping. The ferroelectric measurement of YMn_(1–x)Ti_xO_3 was also measured. YMn_(1–x)Ti_xO_3 still holds the original ferroelectric properties, and the polarization strength becomes larger when the doping concentration increases.
A solid solution of titanium doped YMn_(1–x)Ti_xO_3(x=0.1, 0.2) was prepared by a solid-state reaction method. The lattice structure, magnetic properties and ferroelectric properties of the doped system were investigated. The results show that the doped sample still maintains a hexagonal phase structure, and a rhombohedral ■ structure appears as x=0.2. YMn_(1–x)Ti_xO_3 has ferroelectric and antiferromagnetic behaviors as a weak ferromagnetic material. The Weiss temperature(negative value) obtained by the Curie-Weiss fitting increases gradually with the increase of doping, indicating that the antiferromagnetism is weakened. Based on the temperature variation curve and relaxation curve, the system has a spin glass transition at a low temperature, and the freezing temperature Tf decreases with the increase of doping. The ferroelectric measurement of YMn_(1–x)Ti_xO_3 was also measured. YMn_(1–x)Ti_xO_3 still holds the original ferroelectric properties, and the polarization strength becomes larger when the doping concentration increases.
引文
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[10]JOY P A,KUMAR P S A,DATE S K.The relationship between field-cooled and zero-field-cooled susceptibilities of some ordered magnetic systems[J].J Phys Condens Matter,1998,10(48):11049.
[11]CHEN W R,ZHANG F C,MIAO J,et al.Re-entrant spin glass behavior in Mn-rich YMnO3[J].Appl Phys Lett,2005,87(4):2331.
[12]VINCENT E,HAMMANN J,OCIO M,et al.Slow dynamics and aging in spin glasses[J].Lect Not Phys,1996,492:184-219.
[13]KINZEL W.Remanent magnetization in spin-glasses[J].Phys Rev B,1979,19(9):4595-4607.
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[16]郑东兴.YMnO3基多铁异质结的界面耦合效应[D].天津大学,2016.
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[18]WAN F,BAI X,SONG K,et al.Structure and magnetism of Cr-doped h-YMnO3[J].J Magn Magn Mater,2017,424:371-375.