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Effect of hydration on microstructure and microwave dielectric properties of CaSmAlO4-based ceramics

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Abstract

Ca1.15Sm0.85Al0.85Ti0.15O4 ceramics with different ball milling temperatures were prepared by the solid-phase method. The X-ray diffraction results showed that the high ball milling temperature (45 ± 5 °C) led to the hydration of the material phase, resulting in the formation of a large amount of (CaO)3Al2O3(H2O)6 phase. The results of the scanning electronic microscope and the energy dispersive spectroscopy confirmed that the hydrated powders resulted in heterogeneous microstructure characteristics with a wide grain size distribution of ceramics sintered, which degraded dielectric characteristics, especially reducing the quality factor (around 30,000). However, controlling the ball mill temperature in the range of 20 ± 5 °C, there was no hydration occurring in the slurry. Thus, the sintered ceramics at optimum temperature exhibited excellent microwave dielectric properties, a dielectric constant of around 19.6, a high-quality factor of 70,000 GHz, and a near zero temperature coefficient (< ± 4 ppm/°C) of resonant frequency in a wide temperature range from − 40 to 125 °C.

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Acknowledgements

The authors acknowledge the support from Suzhou Boom High Purity Materials Technology Co., Ltd and Sichuan Mianyang Weiqi Electronic Technology Co., Ltd.

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  1. School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, China

    Hengheng Feng, Haofeng Jing, Tao Yu & Hongtao Yu

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  1. Hengheng Feng
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  2. Haofeng Jing
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Contributions

All authors contributed to the study concept and design. Material preparation, data collection and analysis were carried out by HF, HJ and TY. The first draft of the manuscript was written by HF. The study was supervised by HY. All the authors have commented on previous versions of the manuscript. Final draft read and approved by all authors.

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Correspondence to Hongtao Yu.

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Feng, H., Jing, H., Yu, T. et al. Effect of hydration on microstructure and microwave dielectric properties of CaSmAlO4-based ceramics. J Mater Sci: Mater Electron 33, 26135–26143 (2022). https://doi.org/10.1007/s10854-022-09300-8

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