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<p>Li<sub>2</sub>Co<sub>1.9</sub>Zn<sub>0.1</sub>Mo<sub>3</sub>O<sub>12</sub> microwave dielectric ceramics were synthesized via the solid-state reaction method and sintered at various temperatures to evaluate their structural evolution and dielectric performance. X-ray diffraction with Rietveld refinement confirmed a single-phase orthorhombic structure, with optimal densification (96.47% relative density) achieved at 775&#xa0;°C. SEM, EDS, and Raman analyses validated microstructural evolution, elemental distribution and vibration characteristics. Zn<sup>2+</sup> substitution modified the sintering behavior, enabled effective densification at a comparatively low temperature of 775&#xa0;°C. Under these conditions, the ceramics exhibited a dielectric constant (<i>ε</i><sub><i>r</i></sub>) of 10.10, a quality factor (<i>Q</i> × <i>f</i>) of 13,800&#xa0;GHz, and a temperature coefficient of resonant frequency (<i>τ</i><sub><i>f</i></sub>) of − 45.96&#xa0;ppm/°C. The inverse correlation between <i>τ</i><sub><i>f</i></sub> and octahedral distortion was established, highlighting the role of lattice symmetry in thermal stability.</p>

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Investigation of Zn2+ substitution on the sintering behavior and microwave dielectric properties of Li2Co1.9Zn0.1Mo3O12 ceramic

  • 期刊论文

  • 发表日期：

    2026年1月25日

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  • Yih-Chien Chen,
  • Trisa Azahra

摘要

Li2Co1.9Zn0.1Mo3O12 microwave dielectric ceramics were synthesized via the solid-state reaction method and sintered at various temperatures to evaluate their structural evolution and dielectric performance. X-ray diffraction with Rietveld refinement confirmed a single-phase orthorhombic structure, with optimal densification (96.47% relative density) achieved at 775 °C. SEM, EDS, and Raman analyses validated microstructural evolution, elemental distribution and vibration characteristics. Zn2+ substitution modified the sintering behavior, enabled effective densification at a comparatively low temperature of 775 °C. Under these conditions, the ceramics exhibited a dielectric constant (εr) of 10.10, a quality factor (Q × f) of 13,800 GHz, and a temperature coefficient of resonant frequency (τf) of − 45.96 ppm/°C. The inverse correlation between τf and octahedral distortion was established, highlighting the role of lattice symmetry in thermal stability.