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Preparation and microwave dielectric properties of BPO_4 ceramics with ultra-low dielectric constant

机译：具有超低介电常数的BPO_4陶瓷的制备和微波介电性能

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摘要

BPO_4 ceramics with a cristobalite-like structure were prepared via solid-state sintering (SSS) and spark plasma sintering (SPS). Significant shrinkage and grain growth were observed with increasing the sintering temperature up to 1200 °C for SSS samples, while the highest relative density is only 74.6% because of the serious sublimation of BPO_4, and the microwave dielectric properties of ε_r = 3.38, Qf = 18,200 GHz and τ_f = -42.8 ppm/°C were achieved at 14.6 GHz for SSS samples sintered at 1000 °C for 3 h. A much higher relative density of 92.7% was obtained in SPS sample (1000 °C/10 min) with ε_r = 4.20, Qf = 4,000 GHz, and τ_f = -20.7 ppm/°C. The Qf value increases by a factor of 6.9 and 5.9 with increasing frequency from 4.6 GHz to 14.6 GHz for SSS and SPS samples, respectively, which implies that the Qf value is dominated by extrinsic factors and has a huge improvement space. The corrected dielectric constant by porosity is only 4.65, indicating that BPO_4 ceramic is a promising candidate as the microwave substrate material if the relative density and microstructure can be further improved.
机译：BPO_4陶瓷具有方石英状结构物通过固态烧结（SSS）和放电等离子烧结（SPS）制备。随着烧结温度高达1200℃下SSS样品中观察到显著收缩和晶粒生长，而最高的相对密度是因为BPO_4的严重升华的只有74.6％，以及微波ε_r= 3.38的介电性能，QF = 18200 GHz和τ_f= -42.8 PPM /℃下在14.6 GHz的实现在1000烧结SSS样品℃下3小时。 SPS样品（1000℃/ 10分钟）与ε_r中得到的92.7％的相对更高的密度= 4.20，QF = 4000千兆赫，和τ_f= -20.7 PPM /℃。由6.9和5.9倍的QF值随着离4.6 GHz的频率增加至14.6千兆赫为SSS和SPS的样品，分别，这意味着QF值由外在因素支配，并且具有一个巨大的改进空间。通过孔隙率校正介电常数仅为4.65，这表明BPO_4陶瓷是一种有希望的候选作为微波衬底材料如果相对密度和微结构可以被进一步改善。

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  • 来源
    《Journal of materials science》 |2021年第5期|6660-6667|共8页
  • 作者

    Xuan Wang; Lei Li; Wen Bin Hong; Han Yan; Shu Ya Wu; Xiang Ming Chen;

  • 作者单位

    Laboratory of Dielectric Materials School of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China;

    Laboratory of Dielectric Materials School of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China;

    Laboratory of Dielectric Materials School of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China;

    Laboratory of Dielectric Materials School of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China;

    Laboratory of Dielectric Materials School of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China;

    Laboratory of Dielectric Materials School of Materials Science and Engineering Zhejiang University 38 Zheda Road Hangzhou 310027 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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