Effects of SnO2 on DC-Bias-Superposition Characteristic of the Low-Temperature-Fired NiCuZn Ferrites

作者：Huan Li; Tang Xiaoli^*; Su Hua; Zhang Huaiwu; Jing Yulan; Liu Baoyuan

来源：IEEE Transactions on Magnetics, 2014, 50(11): 2006104.

DOI：10.1109/TMAG.2014.2324553

• DC-bias-superposition
• low-temperature fired
• NiCuZn ferrite
• SnO2 addition

The microstructure and magnetic properties, especially the dc-bias-superposition characteristic of the SnO2-doped and low-temperature-fired NiCuZn ferrites, were investigated. X-ray diffraction patterns displayed a single-phase spinel structure for all samples. In addition, with the increase of SnO2 content, the average grain size, sintered density, and saturation magnetic flux density (B-s) gradually decreased. Initial permeability and Q-factor value first increased slightly, and then decreased continuously with further increasing SnO2 content. Under relatively low superposition magnetic field (H < 140 A/m), a higher initial permeability favored to obtain a higher incremental permeability. However, when the superposition magnetic field continued to increase, some samples with a lower initial permeability displayed a higher incremental permeability. The incremental permeability was mainly determined by B-s, especially coercivity (H-c) of the samples. The sample with 0.75 wt% SnO2 favored to obtain a better DC-bias-superposition characteristic on incremental permeability and H-70% (the value of the superposition magnetic field when the incremental permeability reduced to 70% of the initial value). Possible mechanisms contributing to the above results were discussed in detail.

• 单位
  电子科技大学; 东莞电子科技大学电子信息工程研究院