Enhanced saturation magnetization and microwave absorption magnetic properties of Mn-Co-Zr substituted BaM ferrite
Enhanced saturation magnetization and microwave absorption magnetic properties of Mn-Co-Zr substituted BaM ferrite
复制标题
DOI：
10.1016/j.jallcom.2016.10.075
复制
发表时间：
2017-02
影响因子：
6.2
通讯作者：
Y. Ren;Haiyang Yan;Xinxi Li;Shiya Lv;Haojun Zhu;Guangai Sun;S. Peng
中科院分区：
文献类型：
--
作者：
Y. Ren;Haiyang Yan;Xinxi Li;Shiya Lv;Haojun Zhu;Guangai Sun;S. Peng
采用溶胶-凝胶法制备了具有高饱和磁化强度的Mn-Co-Zr掺杂BaM铁氧体。取代的单相BaM铁氧体通过在1100 °C下热处理4 h来制备。利用SEM、XRD和振动样品磁强计对样品的形貌、物相和磁性能进行了研究。SEM结果表明，当取代量x = 1.2时，铁氧体颗粒尺寸从250 nm减小到35 nm。虽然BaM铁氧体传统上是永磁材料，但VSM测量表明，它在取代Mn-Co-Zr离子后成为软磁材料。当x = 0.2时，矫顽力（Hc）和Ms分别为3658 Oe和58.8 emu/g，当x = 1.2时，矫顽力（Hc）和Ms分别为317 Oe和48.7 emu/g。采用矢量网络分析仪（VNA）研究了铁氧体的高频电磁特性。发现共振峰随着x的增大而减小。反射损耗（RL）在7.2- 12.2GHz的频率范围内小于10 dB，在9.1- 10.6GHz的频率范围内小于20 dB。最大RL为23 dB，频率为9.7 GHz，x = 1.2。Mn-Co-Zr取代的BaM铁氧体可能是电磁兼容性和高频下其他应用的良好候选者。
Mn-Co-Zr substituted BaM ferrite with enhanced saturation magnetization (Ms) was prepared by so-gel method for high-frequency applications. The substituted single-phase BaM ferrite is prepared by heat treating at 1100 °C for 4 h. We used SEM, XRD and VSM (vibrating sample magnetometer) to study the sample's morphology, phase and magnetic properties. SEM result shows the ferrite particle size is reduced from 250 nm to 35 nm as substitution x = 1.2. Though BaM ferrite is traditionally a permanent magnetic material, VSM measurements indicate it becomes soft magnetic material after substituting the Mn-Co-Zr ions. The coercivity (Hc) and Ms are 3658 Oe and 58.8 emu/g for x = 0.2, and it becomes 317 Oe and 48.7 emu/g for x = 1.2. Vector network analyzer (VNA) was employed to investigate the high-frequency electromagnetic properties of the ferrite. It was found that the resonance peak decreases as x increases. The reflection loss (RL) is smaller than 10 dB for frequency ranges of 7.2–12.2 GHz and smaller than 20 dB for 9.1–10.6 GHz. The maximum RL is 23 dB at frequency of 9.7 GHz for x = 1.2. Mn-Co-Zr substituted BaM ferrite might be a good candidate for electromagnetic compatibility and for other applications at high frequencies.