Abstract
A novel low-fired NaCaLa(MoO4)3 ceramic was synthesized via a conventional solid-state reaction method. The sintering behavior, phase structure, morphology, and microwave dielectric properties of ceramic were systematically investigated. NaCaLa(MoO4)3 compound was confirmed to be a single-phase with a tetragonal scheelite structure of I41/a space group. The sintering temperature will affect the cationic ordering of NaCaLa(MoO4)3 ceramics, thereby affecting the quality factor. NaCaLa(MoO4)3 ceramics exhibited a high relative density above 98% in the all sintering ranges, especially the maximum relative density reached 98.34%. The theoretical dielectric constant and packing fraction were calculated based on the refined parameters. The calculations for the chemical bonds of NaCaLa(MoO4)3 ceramics show that NaCaLa–O bond and Mo–O bond have the upper hand in dielectric constant and quality factor, respectively. NaCaLa(MoO4)3 ceramic sintered at 825 °C demonstrates foremost microwave dielectric properties with low εr = 10.72, high Q × f = 49,495 GHz, and τf = − 49 ppm/°C. Momentously, NaCaLa(MoO4)3 ceramic had a good compatibility with Ag powder, suggesting that it is a potential candidate for LTCC applications.
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Acknowledgements
This work was supported by the Natural Science Foundation of China [Grant Numbers 61761015, 11664008]; the Natural Science Foundation of Guangxi [Grant Numbers 2017GXNSFFA198011, 2018GXNSFFA050001, 2017GXNSFDA198027], and the High-Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by KL, JL, and HZ. The first draft of the manuscript was written by KL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Liu, K., Liang, J., Chen, X. et al. Microwave dielectric performances of a novel low permittivity NaCaLa(MoO4)3 ceramic for LTCC applications. J Mater Sci: Mater Electron 34, 924 (2023). https://doi.org/10.1007/s10854-023-10350-9
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DOI: https://doi.org/10.1007/s10854-023-10350-9