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<p>LiMgPO<sub>4</sub> (LMP) ceramics and (1-<i>x</i>)LMP-<i>x</i>PTFE inorganic-organic composites were successfully prepared using the cold sintering process. The effects of different uniaxial pressures (300-600 MPa), sintering temperatures (160-200 °C), and holding times (30-90 min) on the microstructure and properties of the ceramics were systematically investigated. The results indicate that under the conditions of 600 MPa, 200 °C, and 30 min, the LMP ceramics achieved a relative density of 93.1% and exhibited optimal microwave dielectric properties: <i>ε</i><sub><i>r</i></sub> = 5.12, and <i>tanδ</i> = 6.87×10⁻<sup>3</sup> (1 MHz). Systematic investigation of the cold sintering process parameters revealed that within certain ranges, increased uniaxial pressure and elevated sintering temperature both promote ceramic densification, while appropriate holding time facilitates grain growth, though excessive duration hinders the densification process. To further enhance the performance of LMP ceramics for substrate applications, (1-<i>x</i>)LMP-<i>x</i>PTFE inorganic-organic composites were fabricated under these optimized conditions. The composite with <i>x</i> = 0.4 exhibited optimal microwave dielectric properties: <i>ε</i><sub><i>r</i></sub> = 2.80, <i>Q×f</i> = 9711 GHz, and <i>τ</i><sub><i>f</i></sub> = −39.84 ppm/°C.</p>

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Preparation and properties of LiMgPO4 and its composites using cold sintering process

  • 期刊论文

  • 发表日期：

    2025年11月25日

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  • Jiahui Wang,
  • Xiangchun Liu,
  • Zhe Yang,
  • Miao Zhang,
  • Ziyao Wei,
  • Jiahao Liu,
  • Danni Chen,
  • Yujun Bai,
  • Hao Zhou,
  • Feng Gao

摘要

LiMgPO4 (LMP) ceramics and (1-x)LMP-xPTFE inorganic-organic composites were successfully prepared using the cold sintering process. The effects of different uniaxial pressures (300-600 MPa), sintering temperatures (160-200 °C), and holding times (30-90 min) on the microstructure and properties of the ceramics were systematically investigated. The results indicate that under the conditions of 600 MPa, 200 °C, and 30 min, the LMP ceramics achieved a relative density of 93.1% and exhibited optimal microwave dielectric properties: εr = 5.12, and tanδ = 6.87×10⁻3 (1 MHz). Systematic investigation of the cold sintering process parameters revealed that within certain ranges, increased uniaxial pressure and elevated sintering temperature both promote ceramic densification, while appropriate holding time facilitates grain growth, though excessive duration hinders the densification process. To further enhance the performance of LMP ceramics for substrate applications, (1-x)LMP-xPTFE inorganic-organic composites were fabricated under these optimized conditions. The composite with x = 0.4 exhibited optimal microwave dielectric properties: εr = 2.80, Q×f = 9711 GHz, and τf = −39.84 ppm/°C.