Microwave Dielectric Properties and Microstructures of 0.5La(Mg1/2Ti1/2)O3–0.5CaTiO3 Ceramics with B2O3 Addition

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La(Mg1/2Ti1/2)O3-based ceramics are prepared with a conventional solid-state route. With 50 mol % CaTiO3 addition, 0.5La(Mg1/2Ti1/2)O3–0.5CaTiO3 ceramics with 0.25 wt % B2O3 $\varepsilon _{\text{r}}$ value of ${\sim} 42.92--43.38$, $Q \times f$ values of ${\sim}24000$ (at 7 GHz) and $\tau _{\text{f}}$ values of ${\sim}{-8.9}$ ppm/°C. However, the sintering temperature remains above 1400°C. Doping with B2O3 (up to 1 wt %) can effectively promote the densification and improve the dielectric properties of 0.5La(Mg1/2Ti1/2)O3–0.5CaTiO3 ceramics. The effects of a B2O3 additive on the microstructures, phase formation and microwave dielectric properties of La(Mg1/2Ti1/2)O3–CaTiO3 ceramics system are investigated. The $Q \times f$ value of B2O3–doped 0.5La(Mg1/2Ti1/2)O3–0.5CaTiO3 ceramics can be improved to 28000 (at 8 GHz) at 1400°C due to the liquid-phase effect. The microwave dielectric properties are found to strongly correlate with the sintering temperature as well as the amount of B2O3 added.
2005-09-15