Low-temperature sintering and microwave dielectric properties of Ba3Ti4Nb4O21 with MnCO3–CuO
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Effects of MnCO3–CuO (for short MC) additives on densification and dielectric properties of Ba3Ti4Nb4O21 ceramics have been investigated. The densification temperature of Ba3Ti4Nb4O21 is greatly reduced from 1280 °C for pure Ba3Ti4Nb4O21 to 950 °C with the presence of MC. This is caused by the liquid phase sintering taking place between MC and Ba3Ti4Nb4O21 during sintering. The dielectric constant and the quality factor decrease with increasing MC additives. At a given amount of sintering additive, the dielectric constant and the quality factor decrease with increasing Mn content in the MC mixture. The Ba3Ti4Nb4O21 ceramics with 1 wt% 0.2MnCO3–0.8CuO sintered at 950 °C for 2 h shows dielectric properties: ε r = 66, Q × f = 13,400 GHz and τ f = 60 ppm/°C. Also, the material is compatible with Ag electrodes and, therefore, is suitable for LTCC application.
KeywordsTiO2 Dielectric Property Nb2O5 Microwave Dielectric Property Glass Frit
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