添加Ta2O5对NiCuZn铁氧体显微结构及磁性能的影响

doi:10.3724/SP.J.1077.2014.13463

摘要/Abstract

摘要：

采用固相反应法制备添加Ta₂O₅的NiCuZn铁氧体, 研究了不同Ta₂O₅含量对NiCuZn铁氧体显微结构, 静磁性能和高频损耗的影响。结果表明: Ta₂O₅具有细化NiCuZn铁氧体晶粒的作用, 可降低材料的烧结密度。随着Ta₂O₅含量的增加, 样品的饱和磁感应强度和起始磁导率单调减小, 矫顽力则逐渐增大, 截止频率逐渐升高, 而高频损耗呈先降低后增加的趋势, 其主导因素由剩余损耗逐渐过渡到磁滞损耗。当Ta₂O₅含量为0.12wt%时, 样品在3 MHz、10 mT、100℃下总损耗最小, 为139 mW/cm³, 其中磁滞损耗和剩余损耗分别为93 mW/cm³和46 mW/cm³。

关键词: NiCuZn铁氧体, Ta₂O₅添加剂, 显微结构, 高频损耗

Abstract:

NiCuZn ferrites doped with Ta₂O₅ additive were prepared by solid-state reaction method. The influence of Ta₂O₅ additive on the microstructure, static magnetic properties and high frequency losses (P_cv) of NiCuZn ferrites were investigated. The results reveal that Ta₂O₅ can refine the grain of NiCuZn ferrites, and consequently reduce the sintering density. At the same time, the saturation induction and initial permeability of samples reduce monotonously with the increase of Ta₂O₅ content. The coercive force and resonance frequency, however, increase gradually. Furthermore, the high frequency losses (P_cv) firstly decrease and then increase, and the dominant factor of P_cv transforms from residual loss (P_r) to hysteresis loss (P_h), so the P_cv has a valley value when Ta₂O₅ content is 0.12wt%. The lowest P_cv is 139 mW/cm³ at the conditions of 100℃, 3 MHz and 10 mT, where P_h and P_r are 93 mW/cm³ and 46 mW/cm³, respectively.

Key words: NiCuZn ferrite, Ta₂O₅ additive, microstructure, high frequency losses

中图分类号:

TM277

孙科, 李垚, 杨艳, 兰中文, 余忠, 郭荣迪. 添加Ta₂O₅对NiCuZn铁氧体显微结构及磁性能的影响[J]. 无机材料学报, 2014, 29(6): 633-638.

SUN Ke, LI Yao, YANG Yan, LAN Zhong-Wen, YU Zhong, GUO Rong-Di. Influence of Ta₂O₅ Additive on Microstructure and Magnetic Properties of NiCuZn Ferrites[J]. Journal of Inorganic Materials, 2014, 29(6): 633-638.

图/表 7

图1 不同Ta2O5掺杂量下NiCuZn铁氧体样品的SEM照片

Fig. 1 SEM images of NiCuZn ferrite samples doped with different Ta2O5 contents (a) 0; (b) 0.04wt%; (c) 0.08wt%; (d) 0.12wt%; (e) 0.20wt%; (f) 0.30wt%; (g) 0.50wt%; (h) 1.00wt%

表1 不同Ta2O5掺杂量下NiCuZn铁氧体样品的性能

Table 1 Properties of NiCuZn ferrite samples doped with different Ta2O5 contents

No.	Ta₂O₅/wt%	D/μm	d_m/(g·cm^-3)	μ_i^a	f_r/MHz	B_s^b/mT	P_cv^c/(mW·cm^-3)
T1	0	1.208	5.06	101	78.93	394	364
T2	0.04	1.031	5.00	93	87.79	379	225
T3	0.08	0.986	4.98	90	92.13	373	182
T4	0.12	0.975	4.83	88	96.69	365	139
T5	0.20	0.915	4.79	78	98.58	363	170
T6	0.30	0.910	4.70	74	103.46	351	191
T7	0.50	0.825	4.48	67	117.31	302	—
T8	1.00	0.758	4.13	46	150.09	240	—

图2 不同Ta2O5含量对NiCuZn铁氧体样品的磁性能温度特性的影响

Fig. 2 Influence of different Ta2O5 contents on the temperature dependence of magnetic properties for NiCuZn ferrites

图3 不同Ta2O5含量对NiCuZn铁氧体样品磁谱的影响

Fig. 3 Influence of different Ta2O5 contents on the complex permeability spectra of NiCuZn ferrites

图4 不同Ta2O5含量对NiCuZn铁氧体损耗温度特性的影响

Fig. 4 Influence of different Ta2O5 contents on the temperature dependence of Pcv for NiCuZn ferrites

图5 不同Ta2O5含量对NiCuZn铁氧体Pcv、Ph和Pr的影响

Fig. 5 Influence of different Ta2O5 contents on the Pcv, Ph and Pr for NiCuZn ferrites

图6 不同Ta2O5含量NiCuZn铁氧体样品Pcv、Ph和Pr的频率特性

Fig. 6 Frequency dependence of Pcv, Ph and Pr for NiCuZn ferrite samples doped with different Ta2O5 contents

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添加Ta₂O₅对NiCuZn铁氧体显微结构及磁性能的影响

Influence of Ta₂O₅ Additive on Microstructure and Magnetic Properties of NiCuZn Ferrites

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