锂锌铁氧体微纳米纤维的电纺制备及吸波性能（英文）  

Electrospinning Fabrication and Microwave Absorption Properties of Lithium Zinc Ferrite Micro/Nanofibers

作　　者：赵芳[1] 王建江[1] 许宝才[1] 刘嘉玮[1] 高海涛[1] 

机构地区：[1]军械工程学院先进材料研究所,石家庄050003

出　　处：《高等学校化学学报》2017年第6期922-928,共7页Chemical Journal of Chinese Universities

基　　金：supported by the Natural Science Foundation of Hebei Province,China(No.E2015506011)~~

摘　　要：采用静电纺丝技术结合后续热处理制备了尖晶石型Li_(0.35)Zn_(0.3)Fe_(2.35)O_4微纳米纤维.利用差示扫描量热(DSC)-热重分析(TGA)、傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)和场发射扫描电子显微镜(FESEM)等手段研究了煅烧温度(700,800,900,1000℃)对产物物相和形貌的影响;利用矢量网络分析仪分析了纤维状产物的吸波性能.研究结果表明,Li_(0.35)Zn_(0.3)Fe_(2.35)O_4在700℃及以上温度煅烧后可生成单一尖晶石结构.随着煅烧温度的升高,产物依次呈现出微纳米纤维状、三维网络状、竹节状和颗粒状的微观形貌.随着匹配厚度增加,微纳米纤维状Li_(0.35)Zn_(0.3)Fe_(2.35)O_4的最低反射率向低频移动,在8 GHz以下的最佳匹配厚度为6 mm,在此厚度下吸波性能优良,最低反射率为-26 d B,对应的吸收频率为5.0 GHz,低于-10 d B的吸收频带为4.0~8.0 GHz,带宽为4 GHz.Spinel-type Li0.35Zn0.3Fe2.35O4 micro/nanofibers were prepared through electrospinning and calcination technique, The crystalline phase and mieromorphology of the samples calcined at various temperatures （700, 800,900 and 1000℃ ） for 2 h in air were examined by differential scanning calorimetry （DSC）-thermalgravimetric analysis （TGA）, Fourier transform infrared spectroscopy （FTIR） , X-ray diffraction （XRD） and field emission scanning electron microscopy （ FESEM ）. Microwave absorption properties of Li0.35Zn0.3Fe2.35O4 micro/nanofibers were determined with a vector network analyzer. The results showed that pure spinel structure formed at 700 ℃ and above. As the temperature increased, Li0.35Zn0.3Fe2.35O4 exhibited micro/nanofibrous, 3D network, bamboo-like or granular morphology. The minimum reflectivity of Li0.35Zn0.3Fe2.35O4 micro/nanofibers at 700 ℃ moved to a low frequency as the matching thickness increased. The matching thickness of Li0.35Zn0.3Fe2.35O4 micro/nanofibers was 6 mm below 8 GHz, at which the microwave absorption properties were fine. The minimum reflectivity could reach -26 dB at 5.0 GHz, and the frequency band with reflectivity less than - 10 dB was 4. 0-8.0 GHz.

关 键 词：Li0.35Zn0.3Fe2.35O4 煅烧温度 形貌 微/纳米纤维 吸波性能 

分 类 号：O614[理学—无机化学]