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The sintering behavior and microwave dielectric properties of 0.67CaTiO3–0.33LaAlO3 ceramics sintered at medium temperatures with the additives of H3BO3–Li2CO3

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Abstract

0.67CaTiO3–0.33LaAlO3 (CTLA) microwave dielectric ceramic materials with the additives of H3BO3, Li2CO3 or H3BO3–Li2CO3 were prepared by a conventional solid-state reaction method. The effects of the sintering additives on the densification behavior, phase compositions, microstructures, and microwave dielectric properties of the CTLA ceramic samples were investigated. It was found that the binary additive of H3BO3–Li2CO3 effectively promoted the densification and lowered the sintering temperature of the CTLA ceramic samples without a significant decrease in their Q × f values. For example, with an addition of 0.2 wt% H3BO3–0.1 wt% Li2CO3, the optimal microwave dielectric properties of εr = 45.5, Q × f = 31,771 GHz and a near-zero τf of 2.43 ppm/℃ were obtained in the CTLA ceramic sample sintered at only 1175 ℃, which is significantly lower (~ 225 ℃) compared to the sintering temperatures of conventionally sintered CTLA ceramics.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11774083 and 51902093).

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Authors and Affiliations

  1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, School of Material Science and Engineering, Hubei University, 368 Youyi Avenue, Wuhan, 430062, Hubei, China

    Shuting Niu, Juan Jiang, Jinzhao Wang, Lin Gan & Tianjin Zhang

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  1. Shuting Niu
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Niu, S., Jiang, J., Wang, J. et al. The sintering behavior and microwave dielectric properties of 0.67CaTiO3–0.33LaAlO3 ceramics sintered at medium temperatures with the additives of H3BO3–Li2CO3. J Mater Sci: Mater Electron 31, 14879–14885 (2020). https://doi.org/10.1007/s10854-020-04049-4

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