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锰锌铁氧体结构性能的研究及发展概况 总被引:1,自引:0,他引:1
围绕锰锌铁氧体的尖晶石结构和性能的关系,分析了锌含量、晶粒尺寸、晶界等微观结构参数以及微量元素掺杂等主要因素对锰锌铁氧体结构性能的影响.介绍了今后软磁铁氧体研究的主要方向、性能要求、国内外的研究情况及最新进展.近期研究表明,目前国内外除注重功率型和高磁导率锰锌铁氧体的研究之外,还比较关注锰锌铁氧体的改性研究及其在纳米科技领域的应用和用废旧材料为原料的环保节能型新工艺;锰锌铁氧体今后将进一步向高频、高磁导率和低损耗方向发展,同时注重材质特性的适应性和生产工艺的优化. 相似文献
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简要介绍了自蔓延高温合成技术和热力学判据,评论了此合成技术的新进展和存在的问题,综述了利用此方法制备MnZn、NiZn和MgZn铁氧体材料的制备工艺及其应用研究现状,重点分析讨论了软磁铁氧体的原料配方、合成工艺和磁特性.研究表明,通过控制工艺参数和添加剂的合理使用,SHS法制备铁氧体粉体具有更好的烧结活性和纯度,适合于大规模的工业生产. 相似文献
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用铁砂制备性能优良的软磁锰锌铁氧体 总被引:1,自引:0,他引:1
本文介绍了用铁砂制备M_(?)-2000软磁铁氧体材料的方法,而且讨论了铁砂氧化相变过程和杂质Si对制成的铁氧体性能的影响。 相似文献
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应用水热法掺杂钴离子到纳米镍锌铁氧体粉末中,制备处纳米镍锌钴铁氧体,继而用钴离子代替镍离子制备钴锌铁氧体.并利用XRD、TEM、VNA对其进行表征和分析,研究了纳米镍锌钴铁氧体和纳米钴锌铁氧体的样品粒度、形貌、电磁损耗性能及吸收性能.结果表明:纳米镍锌钴铁氧体由原先纳米镍锌铁氧体的类球形转变为不规则四边形结构.掺杂钴离子后增加吸收器的带宽, 改善材料在低频率的吸波性能。钴锌铁氧体中当Co2+: Zn2+=1: 1时,对于电磁波吸收性能比镍锌钴铁氧体要好,在16.47 GHz处到达33.9 dB. 相似文献
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软磁材料锰锌铁氧体共沉粉料的研制 总被引:12,自引:0,他引:12
本文研究了碳酸盐-氢氧化物法共同沉淀Fe^2+、Mn^2+、Zn^2+时,反应最终pH值、沉淀温度、加料方式、加料速度及搅拌强度等因素对恒定共沉粉Fe2O3、MnO及ZnOmol%组成、粒度和颗粒形状的影响,并进一步考查了共沉粉组成与软磁材料性能的关系。在研究基础上确定生产高频低功耗锰锌铁氧体材料H724(PC40)和高磁导率锰锌铁氧体材料H5C2(μi=10000±30%)共沉粉合成的最宜条件。 相似文献
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Bi-Mo复合掺杂对MgCuZn铁氧体烧结特性和磁性能的影响 总被引:1,自引:0,他引:1
为改善MgCuZn铁氧体的低温烧结特性并提高其软磁性能, 采用传统氧化物法制备MgCuZn铁氧体材料, 研究了Bi-Mo复合掺杂对其烧结特性和软磁性能的影响. 结果表明: 复合掺杂Bi2 O3和MoO3适量时(分别为0.6wt%和0.1wt%), 在较低的烧结温度(1020℃)就能获得较高的烧结密度(<4.75g/cm3), 起始磁导率可达1240, 且具有较高的品质因数(100kHz下为33.8). 通过主成分优选、有效的掺杂技术及工艺条件可以提高MgCuZn铁氧体的综合性能, 使其可应用于多层片式电感中. 相似文献
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高频高Q的NiCoZn铁氧体可作为关键材料应用于EMI(electromagnetic Interference)滤波器,但高烧结温度限制了其与目前主流的LTCC(low temperature Co-fired ceramic)无源集成技术的结合。本文制备了一系列低温烧结(900℃)的Bi4Ti3O12(BIT)掺杂NiCoZn铁氧体,分析了掺杂量变化对关键性能的影响,并与高温烧结(1100℃)的未掺杂NiCoZn铁氧体进行了对比。其中,6%(质量分数)BIT掺杂的铁氧体可以在大幅降低烧结温度的同时得到和高温烧结铁氧体相近的磁导率。进一步,研究了两类铁氧体制作的滤波器的高频EMI抑制性能,发现两种滤波器都能在2~40 MHz的频带内表现出优异的噪声抑制性能。在部分频段,BIT掺杂铁氧体作差模电感的滤波器对差模噪声抑制能力更强,在结合LTCC集成技术开发高性能EMI器件方面表现出很好的潜力。 相似文献
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S. M. A. Radmanesh S. A. Seyyed Ebrahimi 《Journal of Superconductivity and Novel Magnetism》2013,26(7):2411-2417
Magnetic hard/soft SrFe12O19/Ni0.7Zn0.3Fe2O4 nanocomposites were fabricated by a two-step chemical procedure. Strontium hexaferrite NPs were synthesized via sol–gel self-propagation and then dispersed in nickel–zinc ferrite sol to prepare oxide nanocomposites by the glyoxilate precursor method. The initial product was annealed at different temperatures to study the effect of grain size on the magnetic properties of composite hard/soft ferrites. The magnetic nanoparticles (MNPs) were characterized by XRD, FTIR, TEM, and VSM techniques. Magnetic measurements indicated concave hysteresis loops for these two-phase nanocomposites due to non-complete exchange coupling at the interfaces of hard and soft ferrites. This phenomenon could be attributed to the overcritical size, 46 nm, of the hard phase, based on the critical limit of 22 nm predicted by theoretical calculation. At high annealing temperature with increasing the size of the soft phase as well as the hard phase, the dipolar interaction became dominant and the magnetic behavior of hard/soft nanocomposites approached two-phase uncoupled magnets. 相似文献
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V. P. Pashchenko A. A. Khor’yakov A. V. Pashchenko Yu. S. Prilipko A. A. Shemyakov 《Inorganic Materials》2014,50(2):191-196
Detailed studies of manganese zinc ferrites for electronic applications are used to assess the effect of oxygen nonstoichiometry on their structural, electrical, and magnetic properties. The optimal synthesis conditions and nonstoichiometry are determined which ensure the preparation of high-permeability manganese zinc ferrites with low electromagnetic energy losses. The manganese zinc ferrites are shown to be attractive as materials for high-performance magnetoresistive electric current and magnetic field sensors and spintronic devices. 相似文献
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Magnetic and processability studies on rubber ferrite composites based on natural rubber and mixed ferrite 总被引:2,自引:0,他引:2
K. A. Malini E. M. Mohammed S. Sindhu P. A. Joy S. K. Date S. D. Kulkarni P. Kurian M. R. Anantharaman 《Journal of Materials Science》2001,36(23):5551-5557
Polycrystalline single phasic mixed ferrites belonging to the series Ni1–x
Zn
x
Fe2O4 for various values of
x
have been prepared by conventional ceramic techniques. Pre-characterized nickel zinc ferrites were then incorporated into a natural rubber matrix according to a specific recipe for various loadings. The processability and cure parameters were then determined. The magnetic properties of the ceramic filler as well as the ferrite loaded rubber ferrite composites (RFC) were evaluated and compared. A general equation for predicting the magnetic properties was also formulated. The validity of these equations were then checked and correlated with the experimental data. The coercivity of the RFCs almost resemble that of the ceramic component in the RFC. Percolation threshold is not reached for a maximum loading of 120 phr (parts per hundred rubber by weight) of the filler. These studies indicate that flexible magnets can be made with appropriate magnetic properties namely saturation magnetisation (M
s) and magnetic field strength (H
c) by a judicious choice of x and a corresponding loading. These studies also suggest that there is no possible interaction between the filler and the matrix at least at the macroscopic level. The formulated equation will aid in synthesizing RFCs with predetermined magnetic properties. 相似文献
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Presents a phenomenological formulation that broadens the range of applicability of the Basso-Bertotti hysteresis model to include soft magnetic materials with very gradual saturation, such as commercial manganese-zinc (MnZn) power ferrites. The formulation also enables the Basso-Bertotti model to better characterize both the major loop and the minor loops of these soft magnetic materials. The formulation introduces a model parameter mt that defines the transition between low fleld/minor loops and high field/major loop. An explicit expression for magnetization in term of domain-wall position was synthesized to make the hysteresis model numerically attractive. The formulation was verified by experimental data of commercial MnZn ferrites 相似文献
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