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个人信息Personal Information
教授 博士生导师
招生学科专业：
化学 -- 【招收硕士研究生】 -- 材料科学与技术学院
材料科学与工程 -- 【招收博士、硕士研究生】 -- 材料科学与技术学院
机械 -- 【招收博士、硕士研究生】 -- 材料科学与技术学院
材料与化工 -- 【招收博士、硕士研究生】 -- 材料科学与技术学院
主要任职：面向苛刻环境的材料制备与防护技术工业和信息化部重点实验室主任
其他任职：江苏省金属学会副理事长，江苏省热处理及表面改性工程技术研究中心副主任，江苏省机械工程学会材料工程专业委员会副理事长，江苏省复合材料学会常务理事
毕业院校：南京航空航天大学
学历：南京航空航天大学
学位：工学博士学位
所在单位：材料科学与技术学院
办公地点：江宁校区东区D10-材料楼A511
联系方式：13951818597
电子邮箱：
The influence of Nd substitution in Ni–Zn ferrites for the improved microwave absorption properties
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所属单位：材料科学与技术学院
发表刊物：Ceram Int
摘要：Nanocrystalline Ni–Zn ferrites with different neodymium contents (Ni0.5Zn0.5NdxFe2-xO4) were synthesized by sol-gel route combined with self-propagating combustion (SPC) method. The presence of surface functional groups, crystal structure and morphology of the samples were studied by FT-IR, XRD and SEM. The results show that the prepared samples are composed of spinel phase under the condition of low neodymium content, like the pure Ni–Zn ferrite. While neodymium oxide appears after the content of Nd3+ exceeds a certain limit (x > 0.04) and there exist two phases in the ferrite. The results of vibrating sample magnetometer (VSM) and vector network analyzer (VNA) show that adjusting the content of Nd is significant in improving the dielectric properties and microwave absorption capacity of the materials, specifically at low frequencies. When x < 0.04, the enhancement of dielectric loss ability of spinel ferrites by doping Nd3+ is the dominant factor affecting microwave absorption ability of samples. The secondary phase Nd2O3 hardly appears under this condition, thus the weakening effect of Nd3+ addition on magnetic loss ability is not obvious. When x = 0.04, the optimal absorption peak of the material reaches −20.8 dB at 4.4 GHz with a thickness of 8.5 mm and the effective absorption bandwidth (RL < −10 dB) was 3.2 GHz. On the contrary, when x > 0.04, the magnetic loss ability decreases rapidly (e.g., Ms decreases from 82.47 emu/g to 59.77 emu/g). Meanwhile, the dielectric loss increases slowly and the microwave absorption capacity decreases. © 2019 Elsevier Ltd and Techna Group S.r.l.
ISSN号：0272-8842
是否译文：否
发表时间：2020-01-01
合写作者：Qian, Kun,Lin, Haiyan,周金堂,Haidry, Azhar Ali,Qi, Tongbaihui,Chen, Wenjing,Guo, Xinlu
通讯作者：姚正军