| 钴铁氧体亚微米球吸波性能与成分的关系研究 |
| |
| 引用本文： | 纪仁龙,张涛,房洪杰,朱鹏程,孙杰.钴铁氧体亚微米球吸波性能与成分的关系研究[J].人工晶体学报,2017(4):746-752. |
| |
| 作者姓名： | 纪仁龙 张涛 房洪杰 朱鹏程 孙杰 |
| |
| 作者单位： | 烟台南山学院材料系,烟台,265713 |
| |
| 基金项目： | 2015年山东省高等学校优势学科人才团队培育计划 |
| |
| 摘 要： | 用溶剂热方法制备Co_xFe_(3-x)O_4(0≤x≤1)亚微米球,可看作不同比例Fe_3O_4和CoFe2O4的混合物。实验发现:当原料中钴铁原子比为1∶1、1∶2、1∶4和0时,反应得到的球分别为CoFe_2O_4、Co_(0.9)Fe_(2.1)O_4、Co_(0.73)Fe_(2.27)O_4和Fe_3O_4。Fe_3O_4与石蜡混合物(质量分数75wt%)厚度为5.5 mm时,反射率最低为-38 d B,对应频率为4 GHz;Co_(0.9)Fe_(2.1)O_4与石蜡混合物在3~14 GHz频率范围内介电损耗大于磁损耗,计算出来的反射率分贝值(-41.1 d B,12.08GHz,2 mm)低于相关报道。比较四种成分的钴铁氧体球可以看出:当x值不同时,由于成分Fe_3O_4和CoFe_2O_4的自然共振频率不同,引起磁性能随微波频率发生变化,而且由于二价铁离子被钴离子取代,结晶性也发生改变,进而改变了材料的介电和吸波性能。
|
| 关 键 词： | CoxFe3-xO4球 吸波性能 自然共振频率 结晶性 |
Relation of Microwave Absorption Property and Ingredients of Cobalt Ferrite Sub-micro Spheres |
| |
| JI Ren-long,ZHANG Tao,FANG Hong-jie,ZHU Peng-cheng,SUN Jie.Relation of Microwave Absorption Property and Ingredients of Cobalt Ferrite Sub-micro Spheres[J].Journal of Synthetic Crystals,2017(4):746-752. |
| |
| Authors: | JI Ren-long ZHANG Tao FANG Hong-jie ZHU Peng-cheng SUN Jie |
| |
| Abstract: | CoxFe3-xO4 (0≤x≤1) spheres, a mixture of Fe3O4 and CoFe2O4, were synthesized via solvothermal reaction by changing the Co to Fe ratio in ethylene glycol solution.For the solution containing ingredients (atom ratio of Co∶Fe=1∶1,1∶2,1∶4 and 0), the obtained spheres are CoFe2O4, Co0.9Fe2.1O4, Co0.73Fe2.27O4 and Fe3O4 at 200 ℃, respectively.The calculated reflectivity indicates that for the composite containing magnetite(75wt%) and parraffin wax, the lowest reflection loss is-38 dB at 4 GHz with 5.5 mm thickness.The composite containing Co0.9Fe2.1O4 spheres displays better microwave absorption capability.The minimum reflection loss reaches-41.1 dB at 12.08 GHz and the matching thickness is 2 mm.Dielectric loss contributes even more than magnetic loss in the frequency range of 3-14 GHz.The work proves that variation of cobalt element in spheres can change the proportion of CoFe2O4 to Fe3O4, the resonance frequency together with the crystallinity of the spheres, and ultimately the dielectric character and the microwave absorption property. |
| |
| Keywords: | CoxFe3-xO4 sphere microwave absorption property resonance frequency crystallinity |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
