The effect of zinc doping on the structural and magnetic properties of Ni1−xZnxFe2O4
The effect of zinc doping on the structural and magnetic properties of Ni1−xZnxFe2O4
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DOI：
10.1007/s10853-012-7074-y
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发表时间：
2013-04
影响因子：
4.5
通讯作者：
M. Rahimi;P. Kameli;M. Ranjbar;H. Hajihashemi;H. Salamati
中科院分区：
文献类型：
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作者：
M. Rahimi;P. Kameli;M. Ranjbar;H. Hajihashemi;H. Salamati
采用溶胶-凝胶自燃烧法制备了Ni1−xZnxFe2O4纳米粒子（x= 0.0、0.1、0.3、0.5、0.7、1.0），并以四乙酸乙二胺为色剂。详细的x射线衍射分析表明，晶体结构为立方尖晶石，随着x的增大，它经历了从正尖晶石到反尖晶石的相变。随着锌取代量的增加，晶格常数逐渐增大，从0.8339 nm （x= 0.0）增加到0.8443 nm （x= 1.0）。由Scherrer公式测定的平均晶粒尺寸约为14 ~ 35 nm。FTIR分析进一步监测了尖晶石相的形成。振动样品磁强计数据表明，当Zn掺杂量增加到tox= 0.3时，磁化强度增大，再增加inx，磁化强度减小。通过金属阳离子在四面体和八面体位置的分布来讨论这种效应。随着锌含量的增加，样品的磁晶各向异性常数降低，矫顽力也随之降低。
Nanoparticles of Ni1−xZnxFe2O4(x= 0.0, 0.1, 0.3, 0.5, 0.7, and 1.0) were synthesized by the sol–gel auto-combustion method using ethylenediamine tetra acetic acid as a complexion agent. The detailed analysis of X-ray diffraction revealed that the crystalline structure was cubic spinel and by increasingx, it underwent a phase transition from normal to inverse spinel. The crystal lattice constant was increased gradually with increasing zinc substitution from 0.8339 nm (x= 0.0) to 0.8443 nm (x= 1.0). Also, the average crystallite size, which is determined from Scherrer formula, was about 14–35 nm. The spinel phase formation was further monitored by the FTIR analysis. The vibration sample magnetometer data showed that by increasing Zn doping level up tox= 0.3, the magnetization was increased and it was decreased by further increase inx. This effect was discussed by metal cations distribution into the tetrahedral and octahedral sites. Also, the coercivity was decreased by increasing Zn content due to the decrease of magnetocrystalline anisotropy constant of the samples.