Low-temperature sintering and ferromagnetic properties of Li0.35Zn0.30Mn0.05Ti0.15Fe2.15O4 ferrites co-fired with Bi2O3-MgO mixture.

In the present work, Li 0.35 Zn 0.30 Mn 0.05 Ti 0.15 Fe 2.15 O 4 ferrites were successfully synthesized via solid-state reaction method with the assistance of Bi 2 O 3 -MgO mixture. It was observed that a pure spinel phase could be formed at low temperatures (880 °C–920 °C), suggesting the compatibility of co-firing with silver internal electrodes. The employment of Bi 2 O 3 -MgO mixture could not only achieve the low-temperature sintering, but also facilitate the grain growth and subsequently promote the magnetic properties. SEM results revealed that the ferrites grain size was significantly increased (from 1 to 20 μm) with an appropriate dopant addition (1.2 wt %). Meanwhile, the saturation induction was enhanced from 141.2 to 345.9 mT, the coercivity was decreased from 515.2 to 176.6 A/m, and the FMR linewidth was dramatically decreased from 749.0 to 245.0 Oe at 9.3 GHz. Thus it is expected that the improved properties will allow the Li 0.35 Zn 0.30 Mn 0.05 Ti 0.15 Fe 2.15 O 4 ferrites to be a promising candidate for low temperature co-fired ceramics (LTCC) applications. Image 1 • Low-temperature preparation of LiZn ferrites (below 950 °C). • All the samples with Bi 2 O 3 -MgO mixture show a typical spinel structure. • Bs increased from 141 to 345 mT with the ΔH decreased from 749 to 245 Oe. [ABSTRACT FROM AUTHOR]