Low-temperature sintering and ferrimagnetic properties of LiZnTiMn ferrites with Bi2O3-CuO eutectic mixture

• Published in: Journal of alloys and compounds 2017-02, Vol.695, p.3233-3238
• Main Authors: Xie, Fei, Jia, Lijun, Zhao, Yuanpei, Li, Jie, Zhou, Tingchuan, Liao, Yulong, Zhang, Huaiwu
• Format: Article
• Language: English
• Subjects: LiZnTiMn ferrite; LTCC; Magnetic properties; Microstructure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2016.11.266

The effects of Bi2O3-CuO mixture on the microstructural development and gyromagnetic properties of low-temperature sintered Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4 (LiZnTiMn) ferrites have been studied in order to adapt the development of low-temperature co-fired ceramics (LTCC) technology and produce gyromagnetic devices with a multilayer process. In this work, a pure spinel phase can be formed with a sintering temperature ranging from 880 °C to 900 °C, which allows them to be co-fired with silver internal electrodes. The addition of Bi2O3-CuO mixture in LiZnTiMn ferrites contributes significantly to the grain growth, densification and improving ferrimagnetic properties through a low-temperature sintering process. Their low-temperature sintering mechanism was proposed and discussed. The results show that the codoping of 0.21 wt% Bi2O3 and 0.29 wt% CuO cannot only double increase the saturation induction, but also drastically reduce the ferromagnetic resonance line width at 9.3 GHz, indicating that Bi2O3-CuO additive is a good candidate for reducing the sintering temperature of LiZnTiMn ferrites. •A low-temperature sintering mechanism for LiZnTiMn ferrite with Bi2O3-CuO mixture is proposed.•The mechanism relies on the action of lattice activation and additional capillary pressure.•The composition of mixture should be strictly controlled to improve the ferrite performance.