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首页> 外文会议>The 10th International Conference on Ferrites（2008中国国际铁氧体研讨会）论文集 >Tailoring the Temperature Characteristics of the Magnetic Permeability of NiZn-ferrites
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Tailoring the Temperature Characteristics of the Magnetic Permeability of NiZn-ferrites

机译：量身定制NiZn铁氧体磁导率的温度特性

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摘要

The effect of cobalt addition on the temperature characteristics of the magnetic permeability of NiZn ferrites was studied and a comparison to the respective behaviour of cobalt in NiCuZn ferrites was examined.Cobalt-doped NiZn and NiCuZn ferrites were manufactured by the ceramic route and sintered under various atmosphere profiles. The chemical and morphological characteristics were evaluated by X-ray diffraction (XRD),scanning electron microscopy (SEM) and thermogravimetric analysis (TGA-DSC). The evaluation of the magnetic performance of the sintered ferrites showed that reducing atmosphere profiles during the top temperature and cooling time of the sintering process favour the temperature stability of the permeability in the case of NiZn ferrites, while preserving the losses at low levels. Two mechanisms that take place at the same time are proposed:the change of the Fe2+ /Fe3+ ratio due to the reducing atmosphere in combination with an increase of the magnetocrystalline anisotropy and magnetostriction due to the reduction C03+-C02+ under N2 atmospheres suggest a useful method to tailor the temperature factor aF of NiZn ferrites. However, the method cannot be applied in NiCuZn ferrites, as the reduction Cu2+-Cu+ taking place under N2 atmospheres enhances secondary re-crystallization phenomena, causing a dramatic increase in losses.
机译：研究了添加钴对NiZn铁氧体磁导率温度特性的影响，并比较了NiCuZn铁氧体中钴的各自行为。通过陶瓷工艺制备了掺钴的NiZn和NiCuZn铁氧体，并在不同的条件下进行了烧结。大气廓线。通过X射线衍射（XRD），扫描电子显微镜（SEM）和热重分析（TGA-DSC）对化学和形态特征进行了评估。烧结铁氧体的磁性能评估表明，在烧结过程的最高温度和冷却时间过程中，降低气氛分布有利于镍锌铁氧体的磁导率温度稳定性，同时保持低水平的损耗。提出了同时发生的两种机理：在还原气氛下，Fe2 + / Fe3 +比值的变化，以及在N2气氛下还原C03 + -CO2 +引起的磁晶各向异性的增加和磁致伸缩的磁致伸缩。调整NiZn铁氧体的温度因子aF。但是，该方法不能用于NiCuZn铁氧体，因为在N2气氛下发生的还原Cu2 + -Cu +会增强二次再结晶现象，从而导致损耗急剧增加。

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