Dy替代Y对Y_(1-x)Dy_xCrO_3体系磁性质的影响  

Magnetic Properties of Y_(1-x)Dy_xCrO_3 System by Dy Substitution for Y

作　　者：王桂英[1,2] 唐永刚[1,2] 毛强[1,2] 郭腾[3] 刘宁[1,3] 彭振生[1] 

机构地区：[1]自旋电子与纳米材料安徽省重点实验室(培育基地),安徽宿州234000 [2]宿州学院机械与电子工程学院,安徽宿州234000 [3]安徽科技学院理学院,安徽凤阳233100

出　　处：《稀有金属》2014年第3期386-391,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金重点项目(19934003);安徽省自然科学基金项目(1308085MA11);安徽省教育厅自然科学研究重点项目(KJ2013A245;KJ2011A259;KJ2012Z404)资助

摘　　要：用固相反应法制备了Y1-xDyxCrO3(x=0,0.1)多晶样品。通过X射线衍射(XRD)图谱检测了样品的结构,测量了样品的磁性,作了磁化强度-温度(M-T)曲线、磁化强度-磁场(M-H)曲线,研究了Dy3+替代Y3+对Y1-xDyxCrO3体系磁性质的影响。结果表明,Dy3+替代多铁性YCrO3中的Y3+对YCrO3的磁性有效大影响。YCrO3在奈尔温度TN=139 K以下呈倾角反铁磁,显示弱铁磁性;Dy3+替代Y3+后的Y0.9Dy0.1CrO3样品,在50 K<T<142 K温区,少量Dy3+在两相邻Cr3+产生的倾角反铁磁内场作用下沿内场反方向排列,使铁磁性减弱;在T<50 K温区,Dy3+-O2--Dy3+层的铁磁性与Cr3+-O2--Cr3+层的铁磁性耦合,铁磁性增强。The polycrystalline samples of Y1-xDyxCrO3 （x = 0, 0.1 ） were prepared by the solid-state reaction method, and the structures of samples were analyzed by X-ray diffraction （XRD） pattern. The effect of Dy^3＋ substitution for Y^3＋on the magnetic properties of Y1-xDyxCrO3 system was researched through the measurements of the magnetization-temperature （M-T） curves and the magnetization-magnetic field（M-H） curves. The results showed that the effect of Dy^3＋ substitution for Y^3＋ on the magnetic properties of Y1-xDyxCrO3 system was strong. The sample of YCrO3 showed a canted antiferromagnetism when T was below the Neer temperature TN = 139 K, which was weak ferromagnetism. For the sample of Y0.9 Dy0.1CRO3 with Dy^3＋ substitution for Y^3＋ in the temperature range from 50 to 142 K, a small amount of Dy^3＋ was reverse direction along the infield caused by canted antiferrumagnetism between two adjacent Cr3 ＋ , resulting in the decrease of ferromagnetism. In the temperature range of T 〈 50 K, a coupling was found between ferromagnetic layer of Dy^3＋ - 02 - - Dy^3＋ and ferromagnetic layer of Cr^3＋ - O^2 - - Cr^3＋ , which led to the increase of ferromagnetism.

关 键 词：多铁性材料 Dy替代 磁性质 

分 类 号：O649[理学—物理化学] O482.5[理学—化学]