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Synthesis and magnetic properties of Mn doped ZnO nanowires

机译：Mn掺杂ZnO纳米线的合成与磁性

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摘要

Mn doped ZnO nanowires have been synthesized using a simple autocombustion method. The as-synthesized Mn doped ZnO nanowires were characterized by X-ray diffraction and transmission electron microscopy. An increase in the hexagonal lattice parameters of ZnO is observed on increasing the Mn concentration. Optical absorption studies show an increment in the band gap with increasing Mn content, and also give evidence for the presence of Mn~(2+) ions in tetrahedral sites. All Zn_(1-x)Mn_xO (0 ≤ x ≤ 0.25) samples are paramagnetic at room temperature. However, a large increase in the magnetization is observed below 50 K. This behavior, along with the negative value of the Weiss constant obtained from the linear fit to the susceptibility data below room temperature, indicate ferrimagnetic behavior. The origin of ferrimagnetism is likely to be either the intrinsic characteristics of the Mn doped samples, or due to some spinel-type impurity phases present in the samples that could not be detected.
机译：Mn掺杂的ZnO纳米线已使用简单的自动燃烧方法合成。通过X射线衍射和透射电子显微镜对合成后的Mn掺杂ZnO纳米线进行了表征。随着Mn浓度的增加，ZnO的六方晶格参数增加。光吸收研究表明带隙随Mn含量的增加而增加，也为四面体位点存在Mn〜（2+）离子提供了证据。所有Zn_（1-x）Mn_xO（0≤x≤0.25）样品在室温下都是顺磁性的。但是，在50 K以下观察到磁化强度有很大增加。这种行为，以及从线性拟合到低于室温的磁化率数据获得的Weiss常数的负值，表明亚铁磁行为。亚铁磁性的起源可能是锰掺杂样品的固有特性，或者是由于样品中存在一些无法检测到的尖晶石型杂质相。

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