A comparative study of microstructure, magnetic, and electromagnetic properties of Zn2W hexaferrite prepared by sol-gel and solid-state reaction methods
A comparative study of microstructure, magnetic, and electromagnetic properties of Zn2W hexaferrite prepared by sol-gel and solid-state reaction methods
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溶胶-凝胶法与固相反应法制备Zn2W六方晶系铁氧体的微观结构、磁学和电磁性能对比研究
DOI：
10.1007/s10971-020-05364-2
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发表时间：
2020
影响因子：
2.5
通讯作者：
Zhang Yang
中科院分区：
文献类型：
--
作者：
Fan Lining;Zheng Hui;Zhou Xuehai;Zhang Hongbo;Wu Qiong;Zheng Peng;Zheng Liang;Zhang Yang
在这项工作中，通过溶胶凝胶（SG）和固相反应（SSR）方法制备了Zn2W六方铁氧体。研究了所获得的Zn2W六方晶系铁氧体的显微结构、磁性和电磁性能对两种不同制备方法和烧结温度的依赖性。首先，通过SG法在高于1250°C的烧结温度下获得了单相Zn2W六方铁氧体，但SSR法却并非如此。其次，在相同的烧结条件下，SG法制备的Zn2W六角铁氧体比SSR法制备的Zn2W六角铁氧体具有更大的晶粒尺寸，因为所获得的纳米级前驱体粉末具有更高的活性。第三，在1250℃下烧结的SG法制备的Zn2W六角铁氧体的饱和磁化强度获得了本文中的最高值77.48emu/g，该值高于在1300℃下烧结的SSR法制备的Zn2W六角铁氧体的72.49emu/g的值。最终，SG法和SSR法制备的六方铁氧体的反射损耗值分别在17.0GHz处达到22.4dB，10以上带宽为0.87GHz，在17.9GHz处达到29.5dB，带宽在1.38GHz左右，满足高频微波应用的吸收要求。研究了SG和SSR方法对制备的Zn2W六方晶系铁氧体性能的影响。 SG法制备的样品具有较高的纯度和晶体活性，具有较好的磁性能。在吸收特性方面，SSR制备的样品具有更宽的带宽和更高的反射损耗值。
In this work, Zn2W hexaferrite was prepared by sol–gel (SG) and solid-state reaction (SSR) methods. The dependency of the microstructure, magnetic, and electromagnetic properties of the obtained Zn2W hexaferrite on the two different preparation methods and the sintering temperature was investigated. First, single-phase Zn2W hexaferrite was obtained by the SG method at sintering temperatures higher than 1250 °C, but this was not the case with the SSR method. Second, the Zn2W hexaferrite prepared by the SG method had a larger grain size than those prepared by the SSR method under the same sintering conditions due to the higher activity of the obtained nanosized precursor powder. Third, the saturation magnetization obtained the highest value herein of 77.48 emu/g from the Zn2W hexaferrite prepared by the SG method sintered at 1250 °C, which is higher than the value of 72.49 emu/g from the Zn2W hexaferrite prepared by the SSR method sintered at 1300 °C. Finally, the values of reflection losses reached a maximum of 22.4 dB at 17.0 GHz with the bandwidth of 0.87 GHz over 10 and 29.5 dB at 17.9 GHz with around the bandwidth of 1.38 GHz for the hexaferrite prepared by the SG method and SSR methods, respectively, which meets the absorption requirement for high-frequency microwave applications.Influence of the preparation methods of SG and SSR on the properties of prepared Zn2W hexaferrites was researched. In virtue of the higher purity and crystal activity, the samples prepared by the SG method had better magnetic properties. In terms of absorption property, the samples prepared by SSR have broader bandwidth and higher values of reflection losses.