Abstract
The effects of Bi modification on the microstructural development and gyromagnetic properties of low-temperature sintered ferrites with composition of Li0.42Zn0.27Ti0.11Mn0.1Fe2.1−xBixO4 (x = 0.0-0.1) have been studied in order to adapt the development of low-temperature cofired ceramics technology (LTCC) and produce gyromagnetic devices with a multilayer process. In the present 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. We found that Bi3+ ions could enter into the ferrite lattice, which enhanced the grain growth and densification during sintering due to the activation of the lattice. Results show that the modifying of x = 0.003 cannot only double saturation induction but also drastically reduce ferromagnetic resonance line width at 9.3 GHz, indicating that Bi modification is a good approach for lowing the sintering temperature of LiZnTiMn ferrites.
Highlights
Due to the miniaturization trend of microwave devices in past few years, low temperature co-fired gyromagnetic ferrites have received much attention.[1,2,3] As one kind of important gyromagnetic materials applied in phase shifters, LiZnTi ferrites have been studied and developed in recent years due to their high Curie temperature, wide range of saturation magnetization (Ms), high remanence ratio (Br/Bs), and low sensitivity of remanence (Br) to stress.[4,5] the LiZnTi ferrites prepared by traditional methods typically need to be sintered above 1100◦C to achieve high densification
Results show that the modifying of x = 0.003 cannot only double saturation induction and drastically reduce ferromagnetic resonance line width at 9.3 GHz, indicating that Bi modification is a good approach for lowing the sintering temperature of LiZnTiMn ferrites
The initial increase in the Ms could be attributed to increased grain size, while the later decrease is likely due to the porosity, weakening the ferrite magnetization. These results suggest that the ferrimagnetic properties of LiZnTiMn ferrites could be tuned through the Bi modification during low-temperature sintering process
Summary
Due to the miniaturization trend of microwave devices in past few years, low temperature co-fired gyromagnetic ferrites have received much attention.[1,2,3] As one kind of important gyromagnetic materials applied in phase shifters, LiZnTi ferrites have been studied and developed in recent years due to their high Curie temperature, wide range of saturation magnetization (Ms), high remanence ratio (Br/Bs), and low sensitivity of remanence (Br) to stress.[4,5] the LiZnTi ferrites prepared by traditional methods typically need to be sintered above 1100◦C to achieve high densification. Several approaches have been proposed, and it is believed that adding oxide or glass with low melting point is an effective and feasible way to realize sinterability for LTCF technology.[9,10]
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