本文選題：CoFe2O4空心微球 + 溶劑熱法��； 參考：《中北大學》2015年碩士論文

【摘要】：本論文先采用不同制備方法制備CoFe2O4空心微球，旨在探索開發(fā)一條簡單的制備磁性空心微球的綠色工藝；再采用最佳制備工藝，制備出一系列鎳、鋅摻雜以及不同稀土元素摻雜的磁性空心微球；為了進一步提高材料的吸波性能，制備了磁性微球與碳納米管的復合材料。重點考察了這些材料的磁性及0-6GHz(1GHz=1000MHz)頻率范圍內(nèi)的微波吸收性能。 (1)分別采用溶劑熱法和兩種模板法制備尖晶石型鈷鐵氧體，并研究制備工藝對產(chǎn)物結(jié)構、形貌以及性能的影響。結(jié)果顯示，產(chǎn)物均為空心微球結(jié)構，且溶劑熱法得到的樣品分散均勻且粒徑最小(50nm)。該樣品的磁性能和吸波性能也較好，飽和磁化強度和矯頑力分別達到88.45emu g-1和227.84Oe，小于-5dB吸收頻寬為976MHz。 (2)采用溶劑熱法制備了ZnxCo1-xFe2O4和NixCo1-xFe2O4空心微球，以及不同La3+、Ce3+和Nd3+摻雜的Zn0.3Co0.7MxFe2-xO4微球，并采用X射線衍射(XRD)、掃描電鏡(SEM)、透射電鏡(TEM)、振動樣品磁強計(VSM)和矢量網(wǎng)絡分析儀對樣品各性能進行表征。結(jié)果表明，，樣品均為空心微球結(jié)構，Zn0.5Co0.5Fe2O4和Ni0.5Co0.5Fe2O4微球粒徑分別為150nm和200nm。其中Zn0.3Co0.7Fe2O4微球的飽和磁化強度和矯頑力分別為55.94emu g-1和26.76Oe。Ni0.1Co0.9Fe2O4微球的飽和磁化強度和矯頑力分別為81.56emu g-1和200.42Oe。此時，兩種樣品的吸波效果也最佳，最優(yōu)回損值分別可達-17.4dB和-18.4dB。 (3)分別考察了La3+、Ce3+和Nd3+的摻雜量對Zn0.3Co0.7MxFe2-xO4微球磁性和吸波性能的影響。測試結(jié)果顯示，La3+和Ce3+的摻雜明顯提高材料的矯頑力。三種稀土元素的摻雜都可提高鈷鋅鐵氧體的吸波性能。其中Zn0.3Co0.7La0.2Fe1.8O4、Zn0.3Co0.7Ce0.02Fe1.98O4和Zn0.3Co0.7Nd0.2Fe1.8O4吸波效果最好，最大吸收值分別為-16.85dB、-16.62dB和-16.12dB，且Zn0.3Co0.7La0.2Fe1.8O4小于-5dB的吸收頻寬可達3124.8MHz，明顯優(yōu)于Ce3+和Nd3+的摻雜樣品。 (4)采用溶劑熱法制備了Co0.3Zn0.7La0.2Fe1.8O4/CNTs復合材料，并考察碳納米管含量對復合材料磁性和吸波性能的影響。當碳納米管含量為10%時，Co0.3Zn0.7La0.2Fe1.8O4/CNTs復合材料的矯頑力最大(107.14Oe)，此時復合材料的吸波性能也最佳，最大吸收值和小于-5dB的頻寬分別為-28.7dB和3496.8MHz。
[Abstract]:In this paper, CoFe2O4 hollow microspheres were prepared by different preparation methods in order to explore a simple green process for the preparation of magnetic hollow microspheres, and then a series of nickel were prepared by the optimum preparation process. The magnetic hollow microspheres doped with zinc and different rare earth elements were prepared. In order to further improve the microwave absorption properties of the composites, the composites of magnetic microspheres and carbon nanotubes were prepared. The magnetic properties and microwave absorption properties of these materials in the frequency range of 0 ~ 6 GHz ~ 1 GHz ~ (1 000 MHz) have been investigated. (1) Spinel cobalt ferrite was prepared by solvothermal method and two template methods, and the effects of preparation process on the structure, morphology and properties of the product were studied. The results show that all the products are hollow microspheres, and the samples obtained by solvothermal method are uniformly dispersed and have the smallest particle size of 50 nm ~ (-1). The saturation magnetization and coercivity reached 88.45emu g-1 and 227.84 Oe, respectively, and the absorption band width less than -5 dB was 976 MHz. ZnxCo1-xFe2O4 and NixCo1-xFe2O4 hollow microspheres were prepared by solvothermal method, and Zn0.3Co0.7MxFe2-xO4 microspheres doped with different La3 ce _ 3 and Nd3 were prepared. The properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM) and vector network analyzer. The results show that the particle sizes of Zn0.5Co0.5Fe2O4 and Ni0.5Co0.5Fe2O4 microspheres are 150nm and 200nmrespectively. The saturation magnetization and coercivity of Zn0.3Co0.7Fe2O4 microspheres are 81.56emu g-1 and 200.42Oe. the saturation magnetization and coercivity of 26.76Oe.Ni0.1Co0.9Fe2O4 microspheres are 81.56emu g-1 and 200.42Oerespectively. At the same time, the two kinds of samples have the best absorbing effect, and the optimum return loss values can reach -17.4 dB and -18.4 dB, respectively. The effects of doping amount of La3 ce 3 and Nd3 on the magnetic properties and microwave absorption properties of Zn0.3Co0.7MxFe2-xO4 microspheres were investigated. The results show that the doping of La _ 3 and Ce3 can obviously improve the coercivity of the materials. Doping of three rare earth elements can improve the absorbing property of cobalt zinc ferrite. Among them, Zn0.3Co0.7La0.2Fe1.8O4 (Zn0.3Co0.7Ce0.02Fe1.98O4) and Zn0.3Co0.7Nd0.2Fe1.8O4 have the best absorbing effect, the maximum absorption values are -16.85dBU -16.62dB and -16.12dB respectively, and the absorption band width of Zn0.3Co0.7La0.2Fe1.8O4 less than -5dB can reach 3124.8 MHz, which is obviously better than that of Ce3 and Nd3 doped samples. (4) Co0.3Zn0.7La0.2Fe1.8O4/CNTs composites were prepared by solvothermal method, and the effects of carbon nanotube content on magnetic properties and absorbing properties of the composites were investigated. When the content of carbon nanotubes is 10, the coercivity of the CNTs composites is 107.14 Oe, and the maximum absorption value and the frequency width less than -5 dB are -28.7dB and 3496.8MHz. respectively.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB383.1

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