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Enhancing microwave dielectric properties of Na5Tb(MoO4)4 ceramics by substituting Ag into the Na site

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Abstract

The structures and microwave dielectric properties of Na5−xAgxTb(MoO4)4 ceramics were explored. Single Na5Tb(MoO4)4 phased solid solutions were obtained for specimens with x values ranging from 0 to 0.07, with a small amount of Mo-rich second phase detected at x = 0.09. Although the solid solution range is very limited, the advantage of silver substitution is that it lowers the sintering temperature, increases the densification, and enhances the dielectric properties of the ceramics. The P–V–L bond theory was employed to analyze the correlations between the chemical bond parameters and microwave dielectric properties, which were predominantly influenced by the ionicity and lattice energy of the Tb–O bond. The Na3.93Ag0.07Tb(MoO4)4 compound sintered at 530 °C exhibited excellent microwave dielectric properties (εr = 8.5, Q × f = 54,000 GHz and τf =  − 24 ppm/°C), which are very promising for microwave and millimeter wave applications.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially sponsored by the Ministry of Science and Technology of Taiwan under the projects MOST 111-2221-E-006-164-MY2. The authors would like to thank Ms. Hui–Jung Shih with the Instrument Center of National Cheng Kung University for supporting the use of high-resolution SEM (Hitachi SU8000). The authors also gratefully acknowledge the use of D8 Discover equipment belonging to the Instrument Center of National Cheng Kung University.

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  1. Department of Electrical Engineering, National Cheng Kung University, Tainan City, Taiwan

    Cheng-Liang Huang, Ting-Hao Lin, I.-Chun Ling & Tsung-Hsien Hsu

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Contributions

Ting-Hao Lin: Conceptualization, Methodology, Investigation. I-Chun Ling: Validation, Data Curation, Investigation. Tsung-Hsien Hsu: Validation, Data Curation, Investigation. Cheng-Liang Huang: Writing—Original Draft, Supervision.

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Correspondence to Cheng-Liang Huang.

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Huang, CL., Lin, TH., Ling, IC. et al. Enhancing microwave dielectric properties of Na5Tb(MoO4)4 ceramics by substituting Ag into the Na site. J Mater Sci: Mater Electron 35, 662 (2024). https://doi.org/10.1007/s10854-024-12431-9

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