CAJ | 학술논문

利用固相反应法制备了 Al 掺杂的 NdFe1－x Alx O3系列化合物。通过X射线粉末衍射和结构精修分析发现，随着Al掺杂量的增加，样品晶胞参数变小，晶胞内Fe—O 键长、Fe—O—Fe键角也发生了很大程度的改变，并且在a、b、c 方向上存在不同的变化规律。 Al掺杂导致样品结构上的改变对其磁学性质具有重要影响。磁测量结果表明，随着 Al 掺杂量的增加，由dzyaloshinsky-moriya(D-M)相互作用导致的宏观磁性逐渐减弱；由Nd离子磁晶格与 Fe 离子磁晶格耦合作用导致的体系自旋重取向相变温度向低温方向移动，样品的饱和磁化强度随着Al掺入浓度的增加呈减小趋势。表明Fe位非磁性元素 Al 的掺入，使得样品内部由D-M相互作用所引起的倾角反铁磁结构受到了明显的调制。
이용고상반응법제비료 Al 참잡적 NdFe1－x Alx O3계렬화합물。통과X사선분말연사화결구정수분석발현，수착Al참잡량적증가，양품정포삼수변소，정포내Fe—O 건장、Fe—O—Fe건각야발생료흔대정도적개변，병차재a、b、c 방향상존재불동적변화규률。 Al참잡도치양품결구상적개변대기자학성질구유중요영향。자측량결과표명，수착 Al 참잡량적증가，유dzyaloshinsky-moriya(D-M)상호작용도치적굉관자성축점감약；유Nd리자자정격여 Fe 리자자정격우합작용도치적체계자선중취향상변온도향저온방향이동，양품적포화자화강도수착Al참입농도적증가정감소추세。표명Fe위비자성원소 Al 적참입，사득양품내부유D-M상호작용소인기적경각반철자결구수도료명현적조제。
Al doped orthoferrites NdFe1-x Alx O3 was synthesized by solid state reaction.X-ray powder diffraction and the rietveld refinement results show a decrease in the lattice parameters as Al doping content x increasing. Higher Al doping level leads to significant change on Fe—O bond length as well as Fe—O—Fe bond angle in the unit cell,and such change shows different behaviors in the directions of a,b and c axis.Magnetic properties of the sample are significantly affected by the structure change of the sample,which was caused by Al doping. Magnetic measurement results indicate that weak ferromagnetic ordering resulted from Dzyaloshinsky-Moriya (D-M)interaction was reduced with the increasing Al doping content and the phase transition temperature of spin reorientation interaction owing to the interaction between Nd ion and Fe ions moves to lower temperature with higher Al doping level.Furthermore,magnetization of the sample was decreased along with the increasing Al-doping content,indicating that the canted antiferromagnetic structure is evidently modulated by the nonmag-netic Al-doping in Fe site.