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Characterization of LiF/CuO-Codoped BaTiO3 for Embedded Capacitors

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Abstract

Sintering additives for BaTiO3 were studied in order to facilitate the use of BaTiO3 as a material for embedded decoupling capacitors in high-density multilayered low-temperature cofired ceramic (LTCC) modules for mobile communication systems and three-dimensional (3D) printing modules. Among the studied additives, the CuO/LiF mixture was the most promising sintering additive for cofiring BaTiO3 with a commercial low-permittivity (ε r) LTCC sheet (MLS-22, NEG Co.). The temperature dependence of the dielectric properties of BaTiO3 was successfully controlled by adjusting the CuO/LiF amount and ratio and the sintering temperature. BaTiO3 codoped with 10 wt.% LiF/CuO (1:1 ratio) and sintered at 860°C for 30 min showed 95% sintering density. The room-temperature permittivity (ε r) of LiF/CuO-codoped BaTiO3 was 1620 at 1 MHz, and the temperature coefficient of capacitance satisfied the X5R specification. After cofiring this LiF/CuO-codoped BaTiO3 ceramic with an MLS-22 sheet at 860°C, there was no crack formation at the layer boundary. Also a chemical compatibility test revealed that there were no severe reactions between the LiF/CuO-codoped BaTiO3 and an Ag electrode.

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  1. Department of Display Materials Engineering, Soonchunhyang University, Asan, 336-745, Republic of Korea

    Kyoungho Lee

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  1. Kyoungho Lee
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Correspondence to Kyoungho Lee.

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Lee, K. Characterization of LiF/CuO-Codoped BaTiO3 for Embedded Capacitors. J. Electron. Mater. 44, 797–803 (2015). https://doi.org/10.1007/s11664-014-3526-2

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  • DOI: https://doi.org/10.1007/s11664-014-3526-2

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