Comparison between Nb2O5 and CaCO3 additions on the DC-bias-superposition characteristic of low-temperature-fired NiCuZn ferrites
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The DC-bias-superposition characteristic of NiCuZn ferrites is essential for power multilayer chip inductors (MLCIs). In this study, different amounts of Nb2O5 and CaCO3 were added to low-temperature-fired NiCuZn ferrites to improve the DC-bias-superposition characteristic of these ferrites. The X-ray diffraction (XRD) patterns of Nb2O5- and CaCO3-doped ferrites exhibited single spinel phase in our testing range. Permeability and bulk density gradually decreased as Nb2O5 and CaCO3 contents increased. The higher the coercive force was, the better the DC-bias-superposition characteristic would be. We compared the Nb2O5- and CaCO3-doped ferrites when the same permeability was obtained, and we observed that the DC-bias-superposition characteristic of the Nb2O5-doped sample was better than that of the CaCO3-doped ferrite. Thus, the former was more suitable than the latter for power MLCI applications.
This work was supported by the National Natural Science Foundation of China under Grant Nos 51472042, 61771104 and 61471096. Special Projects on Science and Technology of Guizhou Province 3011. Science and technology support program of Sichuan Province and Dongguan entrepreneurial talent program.
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