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<p>Ca<sub>1-<i>x</i></sub>Sm<sub>1+<i>x</i></sub>Al<sub>1-<i>x</i></sub>Mg<sub><i>x</i></sub>O<sub>4</sub> (0.1 ≤ <i>x</i> ≤ 0.4) ceramics were prepared by the conventional solid-phase method. The effects of Sm/Mg co-substitutions on the phase composition, microscopic morphology, and microwave dielectric properties of CaSmAlO<sub>4</sub> ceramics were investigated. The analysis of the physical phases, microscopic morphology, and energy spectra of the samples revealed that the introduction of Sm/Mg co-substitutions, although prone to producing heterogeneous phases, the average grain size was reduced from 6.1&#xa0;μm to 2.3&#xa0;μm, optimizing the unit cell size. When <i>x</i> value did not exceed 0.2, the ceramics were single-phase with K<sub>2</sub>NiF<sub>4</sub> structure. At the level of x &gt; 0.2, the hetero-phase of Sm<sub>2</sub>O<sub>3</sub> was found in the ceramics, which deteriorated the microwave dielectric properties. When <i>x</i> = 0.2, relatively good dielectric properties were obtained by holding the ceramics at 1475&#xa0;℃ for 4&#xa0;h: <i>ε</i><sub><i>r</i></sub> = 21.12 ± 0.13, <i>Q</i> × <i>f</i> = 50,688 ± 1080&#xa0;GHz, <i>τ</i><sub><i>ƒ</i></sub> = 1.75 ± 0.35&#xa0;ppm/℃ (−&#xa0;40 ~ 25&#xa0;℃), and −&#xa0;0.5 ± 0.22&#xa0;ppm/℃ (25 ~ 125 ℃).</p>

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Extraordinary temperature-stable CaSmAlO4-based microwave dielectric ceramics using Sm/Mg co-substitutions over a wide temperature range

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Chengle Li,
  • Jialing Xu,
  • Xiong Hou,
  • Tianchenxi Gou,
  • Hongtao Yu

摘要

Ca1-xSm1+xAl1-xMgxO4 (0.1 ≤ x ≤ 0.4) ceramics were prepared by the conventional solid-phase method. The effects of Sm/Mg co-substitutions on the phase composition, microscopic morphology, and microwave dielectric properties of CaSmAlO4 ceramics were investigated. The analysis of the physical phases, microscopic morphology, and energy spectra of the samples revealed that the introduction of Sm/Mg co-substitutions, although prone to producing heterogeneous phases, the average grain size was reduced from 6.1 μm to 2.3 μm, optimizing the unit cell size. When x value did not exceed 0.2, the ceramics were single-phase with K2NiF4 structure. At the level of x > 0.2, the hetero-phase of Sm2O3 was found in the ceramics, which deteriorated the microwave dielectric properties. When x = 0.2, relatively good dielectric properties were obtained by holding the ceramics at 1475 ℃ for 4 h: εr = 21.12 ± 0.13, Q × f = 50,688 ± 1080 GHz, τƒ = 1.75 ± 0.35 ppm/℃ (− 40 ~ 25 ℃), and − 0.5 ± 0.22 ppm/℃ (25 ~ 125 ℃).