Enhanced ferromagnetic properties of low temperature sintering LiZnTi ferrites with Li2O–B2O3–SiO2–CaO–Al2O3 glass addition

• LiZnTi ferrites could be fired at ∼900 °C low temperature when the content of LBSCA glass is from 0.15 to 1.7 wt%.
• Small amount of LBSCA glass is conducive to the densification and grain growth.
• The ferromagnetic resonance (FMR) linewidth (ΔH) matches well with the basis of spin wave theory.
• LiZnTi ferrites with optimum content of LBSCA glass have the potential applications in LTCC phase shifters.

The effects of Li2O–B2O3–SiO2–CaO–Al2O3 (LBSCA) glass on the ferromagnetic properties of low-temperature sintered LiZnTi ferrites were systematically investigated. We characterized and analyzed the variation in microstructure, bulk density, porosity and ferromagnetic properties of the samples along with the changes of LBSCA glass content. The results revealed that the densification process of the samples was sensitive to the LBSCA glass content, and low LBSCA glass content was a precondition for sufficient densification, grain growth and ferromagnetic properties. The ferromagnetic resonance (FMR) linewidth (ΔH) was explained on the basis of spin wave theory of anisotropy and porosity broadening in polycrystalline materials. The sample sintered at 900 °C with 0.85 wt% LBSCA glass addition exhibits a saturation magnetization (ms) of 64.23 emu/g and a ferromagnetic resonance (FMR) linewidth (ΔH) of 191 Oe, suggesting that it is promising for LTCC phase shifters.