M型钡铁氧体的掺杂改性研究

发布时间：2018-07-21 17:29

【摘要】：钡铁氧体(BaFe_(12)O_(19))是一种重要的磁性材料,被广泛应用于制造电感器、高密度磁记录材料以及微波器件等其他类型的电子器件。钡铁氧体具有优异的性能,这种材料饱和磁化强度高、矫顽力特别大、居里温度也很高,而且化学稳定性非常好。通常可以通过改进材料的制备工艺以及离子掺杂等手段来提高提升钡铁氧体性能。本文采用固相反应烧结法来制备样品,分别研究了过渡金属W~(6+)、Cu-Ti以及Cu-Sn掺杂对所制备的M型钡铁氧体结构以及电磁相关性能的影响。(1)本文中所掺杂的W~(6+)可以替换Fe~(3+)并进入到钡铁氧体的晶格当中,同时使钡铁氧体的晶格常数a和c减小;W~(6+)离子掺杂能够促进钡铁氧体晶粒长大;适量的W~(6+)离子掺杂能够提高钡铁氧体的致密度,促进烧结。W~(6+)离子掺杂会降低钡铁氧体的饱和磁化强度。随着所掺杂的W~(6+)离子含量的不断增多,所制备样品的的矫顽力呈现出先减小后增大的趋势,样品的磁导率呈现出先增大后减小的趋势,磁损耗正切值也先增大后减小;介电常数逐渐增大,介电损耗能力逐渐减小。(2)在本实验条件下,Cu~(2+)和Ti~(4+)能够进入钡铁氧体的晶格,并使钡铁氧体的晶格常数a和c增大;等比率的Cu-Ti共掺能够促进钡铁氧体晶粒长大,提高钡铁氧体的致密度,因为CuO能够有效地促进烧结,降低烧结温度。Cu-Ti共掺对钡铁氧体地饱和磁化强度影响很小,几乎不改变饱和磁化强度大小,但能使矫顽力在较大范围内降低。随着Cu-Ti离子掺杂量的增多,磁导率和磁损耗正切值几乎不变;介电常数先增大后减小,但介电损耗角几乎不变。(3)在本实验条件下,Cu~(2+)和Sn~(4+)能够进入钡铁氧体的晶格,并使钡铁氧体的晶格常数a和c增大;等比率的Cu-Sn共掺能够促进钡铁氧体晶粒长大,提高钡铁氧体的致密度,因为CuO能够有效地促进烧结,即能够降低反应烧结温度;钡铁氧体的饱和磁化强度几乎不随Cu-Sn掺杂量的变化而改变,饱和磁化强度的大小也几乎不变,但却可以使样品的矫顽力在一个较大范围内逐渐变化。随着Cu-Sn离子掺杂量的增多,磁导率几乎不变,磁损耗正切值先增大后减小;介电常数先增大后减小;介电损耗在低频下几乎不变,在高频下先增大后减小。
[Abstract]:Barium ferrite (BaFe_ (12) O_ (19)) is an important magnetic material and is widely used in the manufacture of inductors, high-density magnetic recording materials, and other types of electronic devices, such as microwave devices. Barium ferrite has excellent properties. This material has high saturation magnetization, high coercivity, high Curie temperature and chemical stability. It is very good that the performance of barium ferrite can be improved by improving the preparation process of material and ion doping. In this paper, the solid phase reaction sintering method is used to prepare samples. The effects of transition metal W~ (6+), Cu-Ti and Cu-Sn doping on the structure of M type barium ferrite and the electromagnetic properties are investigated. (1) The doping of W~ (6+) can replace Fe~ (3+) and enter the lattice of barium ferrite, and decrease the lattice constant a and C of barium ferrite; W~ (6+) ion doping can promote the grain growth of barium ferrite; a proper amount of W~ (6+) ion doping can increase the density of barium ferrite and promote sintering.W~ (6+) ion doping to lower barium ferrite. With the increase of the content of the doped W~ (6+) ion, the coercive force of the prepared sample decreases first and then increases, the permeability of the sample increases first and then decreases, the magnetic loss tangent value increases first and then decreases, the dielectric constant increases gradually, and the dielectric loss ability gradually decreases. (2) Under the present experimental conditions, Cu~ (2+) and Ti~ (4+) can enter the lattice of barium ferrite and increase the lattice constant of barium ferrite, a and C, and the Cu-Ti co doping of the equivalent ratio can promote the grain growth of barium ferrite and increase the density of barium ferrite, because CuO can effectively promote sintering and reduce the sintering temperature.Cu-Ti co doping to barium ferrite. The effect of magnetization is very small, almost without changing the saturation magnetization, but it can reduce the coercive force in a larger range. With the increase of Cu-Ti ion doping, the positive tangent of magnetic permeability and magnetic loss almost invariable, the dielectric constant increases first and then decreases, but the dielectric loss angle is almost constant. (3) under the present experimental conditions, Cu~ (2+) and Sn~ (4+) energy Enough to enter the lattice of barium ferrite and increase the lattice constant a and C of barium ferrite; the Cu-Sn co doping of the equivalent ratio can promote the grain growth of barium ferrite and increase the density of the barium ferrite, because CuO can effectively promote the sintering, that is, it can reduce the reaction sintering temperature, and the saturation magnetization of barium ferrite is almost not with the Cu-Sn doping amount. The magnitude of the saturation magnetization changes almost invariable, but the coercivity of the sample can be changed in a larger range. With the increase of Cu-Sn ion doping, the permeability is almost constant, the magnetic loss tangent value increases first and then decreases; the dielectric constant increases first and then decreases; the dielectric loss is almost constant at low frequency. At high frequency, it increases first and then decreases.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM277

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