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<p>In light of advancements in 5G/6G technologies, current research on microwave dielectric ceramics is focused on the development of materials characterized by low sintering temperatures and low permittivity, in order to satisfy the requirements of high-frequency low-temperature co-fired ceramic (LTCC) applications. Novel monoclinic structure GdBaK(MoO<sub>4</sub>)<sub>3</sub> and YBaK(MoO<sub>4</sub>)<sub>3</sub> ceramics, with <i>C2</i>/<i>c</i> space group, were synthesized using a conventional solid-state method. GdBaK(MoO<sub>4</sub>)<sub>3</sub> and YBaK(MoO<sub>4</sub>)<sub>3</sub> ceramics were sintered at 830&#xa0;°C and 850&#xa0;°C, exhibited <i>ε</i><sub><i>r</i></sub> ~ 8.54 and 8.77, <i>τ</i><sub><i>f</i></sub> ~ − 51.1&#xa0;ppm/°C and − 45.8&#xa0;ppm/°C, <i>Q</i> × <i>f</i> ~ 23, 240&#xa0;GHz and 59, 277&#xa0;GHz, respectively. The compression from Ba<sup>2+</sup> and K<sup>+</sup> cations was identified as the main reason for the higher theoretical <i>ε</i><sub><i>theo</i></sub> compared to the corrected <i>ε</i><sub><i>corr</i></sub>. The dielectric loss of both ceramics is mainly affected by the density and packing fraction. The full width at half maximum (FWHM) values of the vibrational peak at 932 cm<sup>−1</sup>, corresponding to the symmetric stretching modes of MoO<sub>4</sub><sup>2−</sup>, exhibits a negative correlation with the <i>Q</i> × <i>f</i> values. Based on the P–V–L theory, the lattice energy and bond energy associated with the Mo–O bond played a substantial role in influencing the <i>Q</i> × <i>f</i> and <i>τ</i><sub><i>f</i></sub>. Moreover, YBaK(MoO<sub>4</sub>)<sub>3</sub> showed good chemical compatibility with Ag, indicating its potential for LTCC applications.</p>

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Structure, bond characteristics and microwave dielectric properties of glass-free molybdate ceramics ReBaK(MoO4)3 (Re = Gd, Y)

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Yan Wang,
  • Congxue Su,
  • Wenlong Tao,
  • Zelong Chen,
  • Jun Fan,
  • Min Cheng,
  • Beiyi Chen,
  • Huanfu Zhou,
  • Yuan Sun

摘要

In light of advancements in 5G/6G technologies, current research on microwave dielectric ceramics is focused on the development of materials characterized by low sintering temperatures and low permittivity, in order to satisfy the requirements of high-frequency low-temperature co-fired ceramic (LTCC) applications. Novel monoclinic structure GdBaK(MoO4)3 and YBaK(MoO4)3 ceramics, with C2/c space group, were synthesized using a conventional solid-state method. GdBaK(MoO4)3 and YBaK(MoO4)3 ceramics were sintered at 830 °C and 850 °C, exhibited εr ~ 8.54 and 8.77, τf ~ − 51.1 ppm/°C and − 45.8 ppm/°C, Q × f ~ 23, 240 GHz and 59, 277 GHz, respectively. The compression from Ba2+ and K+ cations was identified as the main reason for the higher theoretical εtheo compared to the corrected εcorr. The dielectric loss of both ceramics is mainly affected by the density and packing fraction. The full width at half maximum (FWHM) values of the vibrational peak at 932 cm−1, corresponding to the symmetric stretching modes of MoO42−, exhibits a negative correlation with the Q × f values. Based on the P–V–L theory, the lattice energy and bond energy associated with the Mo–O bond played a substantial role in influencing the Q × f and τf. Moreover, YBaK(MoO4)3 showed good chemical compatibility with Ag, indicating its potential for LTCC applications.