论文部分内容阅读
利用固相反应与球磨相结合的方法,制备了(Cu1-xMnx)Cr O2(0≤x≤6 at%)和Cu(Cr1-yMny)O2(0≤y≤6at%)两个系列的纳米粉体.结果表明,所有样品都具有3R-Cu Cr O2铜铁矿单相结构.晶格膨胀说明Mn离子已分别固溶到(Cu1-xMnx)Cr O2的Cu亚晶格中和Cu(Cr1-yMny)O2的Cr亚晶格中,这在X射线光电子能谱的分析中得到了进一步的证实.B位Mn掺杂样品具有室温铁磁性,磁性源于Cr3+-Mn3+离子对间以空穴为媒介的双交换相互作用.Cu MO2(M=Cr,Mn)铜铁矿纳米粉体的饱和磁化强度比文献值高出约一个数量级,并随着Mn含量的增大而逐渐减小,主要受到3个因素的共同影响:M-M离子对数目、M-M离子间距及空穴浓度.
(Cu1-xMnx) Cr O2 (0≤x≤6 at%) and Cu (Cr1-yMny) O2 (0≤y≤6at%) were prepared by solid-state reaction combined with ball milling. The results show that all the samples have a single phase structure of 3R-Cu Cr O2. The lattice expansion indicates that Mn ions are respectively dissolved into the Cu sub-lattice of (Cu1-xMnx) Cr O2 and Cu -yMny) O2 in Cr sublattices, which is further confirmed by X-ray photoelectron spectroscopy analysis. The B-site Mn-doped samples have room-temperature ferromagnetism and the magnetic originates from holes in the Cr3 + -Mn3 + Is the double exchange interaction of the medium.The saturation magnetization of Cu MO2 (M = Cr, Mn) Cu-Fe nanopowder is about an order of magnitude higher than the literature value and decreases with increasing Mn content, Affected by three factors together: MM ion pairs, MM ion spacing and hole concentration.