本文關(guān)鍵詞：Z型六角鐵氧體的制備及高頻電磁性能研究　出處：《電子科技大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

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【摘要】：自本世紀(jì)以來(lái),通訊和電子技術(shù)飛速發(fā)展,各類(lèi)新型通訊設(shè)備和家用電器更型換代越來(lái)越快,幾百兆左右的高頻段磁性材料已經(jīng)無(wú)法滿(mǎn)足電子領(lǐng)域發(fā)展的需要。磁性材料中六角鐵氧體材料由于其較大的磁晶各向異性而具有較高的截止頻率,因而具有較大的發(fā)展?jié)摿�。六角鐵氧體中的Z型(分子式Ba3Co2Fe24O41)具有低矯頑力、高截止頻率和高磁導(dǎo)率而引起了廣泛關(guān)注。本畢業(yè)論文將以Z型六角鐵氧體材料為研究對(duì)象,在深入分析了其晶體結(jié)構(gòu),物理性能和合成工藝機(jī)理后,對(duì)材料的離子替代,摻雜改性和制備工藝做了細(xì)致深入研究。全文主要內(nèi)容如下:一、研究了不同類(lèi)型離子取代,尤其是稀土離子對(duì)晶相、微觀形貌和微波磁性能的影響。本文對(duì)Z型六角鐵氧體分子式中每種陽(yáng)離子進(jìn)行離子取代,用于取代的離子包括磁性金屬離子和非磁性金屬離子,其中磁性金屬離子又包括磁矩大于Fe3+的和磁矩小于Fe3+的兩種。研究表明取代離子的數(shù)量、半徑和占位對(duì)Co2Z的性能有重大影響,另外原料中氧化物的熔點(diǎn)和電阻率也能影響到最終的性能。二、研究了摻雜對(duì)晶相、微觀形貌和微波磁性能的影響,尤其是摻雜低熔點(diǎn)氧化物所導(dǎo)致的液相燒結(jié)對(duì)微波磁性能的影響。通過(guò)XRD、SEM和矢網(wǎng)儀表征表明3%的Bi2O3在1000 oC條件下有助于實(shí)現(xiàn)樣品的低溫?zé)Y(jié),并能取得不錯(cuò)的Q值,可以用于改善微帶天線磁性能,進(jìn)而提高天線增益。使用已經(jīng)基本成相的尖晶石鐵氧體與預(yù)燒之后的Z型六角鐵氧體粉料混合后進(jìn)行燒結(jié),最終發(fā)現(xiàn)這種摻雜后兩種鐵氧體能夠保證各自的單相性,并且顆粒貼在一起,這使得樣品能夠在微觀上出現(xiàn)大量的界面,使其介電極化效應(yīng)增強(qiáng),介電性能大幅提高,最終改善了電磁波吸收性能。三、研究了氧氣氣氛燒結(jié)對(duì)樣品晶相、微觀形貌和微波磁性能的影響。研究表明氧氣氣氛能夠通過(guò)抑制Fe3+離子還原成Fe2+而控制其損耗,最終提高Co2Z的Q值,擴(kuò)展其應(yīng)用頻段。
[Abstract]:Since this century, with the rapid development of communication and electronic technology, all kinds of new communication equipment and household appliances are changing more and more quickly. Hundreds of megabytes of high-frequency magnetic materials can no longer meet the needs of the development of electronics. Hexagonal ferrite materials in magnetic materials have a higher cut-off frequency due to their larger magnetocrystalline anisotropy. The Z type in hexagonal ferrite (molecular formula Ba3Co2Fe24O41) has low coercivity. High cut-off frequency and high permeability have attracted wide attention. This thesis will focus on Z-type hexagonal ferrite material, after in-depth analysis of its crystal structure, physical properties and synthesis mechanism. The main contents of this paper are as follows: 1. Different kinds of ion substitution, especially rare earth ion pair crystal phase are studied. Effects of micromorphology and microwave magnetic properties. In this paper, each cation in the molecular formula of Z type hexagonal ferrite is replaced by ions, including magnetic metal ions and nonmagnetic metal ions. The magnetic metal ions include those whose magnetic moment is greater than Fe3 and whose magnetic moment is less than Fe3. It is shown that the number, radius and occupation of substituted ions have great influence on the performance of Co2Z. In addition, the melting point and resistivity of the oxide in the raw material can also affect the final performance. Secondly, the effects of doping on the crystal phase, microstructure and microwave magnetic properties are studied. In particular, the effect of liquid phase sintering induced by doping low melting point oxides on microwave magnetic properties was investigated by XRD. SEM and sagittal meter characteristics show that 3% Bi2O3 can be used to improve the magnetic properties of microstrip antennas. It is helpful to achieve low temperature sintering of the samples at 1000oC, and can obtain good Q value, which can be used to improve the magnetic properties of microstrip antennas. Then, the antenna gain is improved. The spinel ferrite, which has been basically formed, is mixed with the pre-fired Z hexagonal ferrite powder to be sintered. Finally, it was found that the two kinds of ferrite after doping can guarantee their monophase and stick together, which makes the samples have a large number of interfaces in the microcosmic, so that the dielectric polarization effect is enhanced. The dielectric properties were improved greatly, and the electromagnetic wave absorption was improved. Thirdly, the sintering effect of oxygen atmosphere on the crystal phase of the samples was studied. The results show that the oxygen atmosphere can control the loss of Fe3 ion by inhibiting its reduction to Fe2, and finally increase the Q value of Co2Z and expand its application frequency band.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM277

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本文編號(hào)：1430977