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<p>This study systematically investigates the influence of the Y<sub>2</sub>O<sub>3</sub>/Ta<sub>2</sub>O<sub>5</sub> doping on the phase structure, microstructure, and dielectric properties of Ba(Zn<sub>0.70</sub>Co<sub>0.25</sub>)<sub>1/3</sub>(Nb<sub>0.95</sub>W<sub>0.075</sub>)<sub>2/3</sub>O<sub><i>δ</i></sub> ceramics for 5G/6G applications. The results demonstrate that Ta<sup>5+</sup> substitutes for Nb<sup>5</sup>, while Y<sup>3+</sup> replaces Co<sup>2+</sup>/Co<sup>3+</sup>, with the accompanying vacancies and defects enhancing ion migration and diffusion. This process promotes densification and lowers the optimal sintering temperature. Optimal doping concentrations of 0.4 wt% Y<sub>2</sub>O<sub>3</sub> and 0.8 wt% Ta<sub>2</sub>O<sub>5</sub> yielded superior performance, with a dielectric constant (<i>ε</i><sub>r</sub>) of 35.3, a quality factor (<i>Q</i> × <i> f</i>) of 71,246&#xa0;GHz, and a temperature coefficient of resonant frequency (<i>τ</i><sub><i>f</i></sub>) of + 4.8&#xa0;ppm/°C. Based on the developed ceramic, a resonator operating at 6.5&#xa0;GHz with a <i>Q</i> factor exceeding 8000 was designed and fabricated. The excellent agreement between HFSS simulations and experimental measurements confirms the material’s performance and demonstrates its strong potential for application in 5G and future 6G communication systems.</p>

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Effect of Y2O3 and Ta2O5 doping on the microwave dielectric properties of Ba(Co0.25Zn0.70)1/3(Nb0.95W0.075)2/3Oδ ceramics

  • 期刊论文

  • 发表日期：

    2026年4月25日

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  • Xiao Zhang,
  • Xiaozhi Liu,
  • Zitao Shi,
  • Bin Tang,
  • Chengtao Yang

摘要

This study systematically investigates the influence of the Y2O3/Ta2O5 doping on the phase structure, microstructure, and dielectric properties of Ba(Zn0.70Co0.25)1/3(Nb0.95W0.075)2/3Oδ ceramics for 5G/6G applications. The results demonstrate that Ta5+ substitutes for Nb5, while Y3+ replaces Co2+/Co3+, with the accompanying vacancies and defects enhancing ion migration and diffusion. This process promotes densification and lowers the optimal sintering temperature. Optimal doping concentrations of 0.4 wt% Y2O3 and 0.8 wt% Ta2O5 yielded superior performance, with a dielectric constant (εr) of 35.3, a quality factor (Q ×  f) of 71,246 GHz, and a temperature coefficient of resonant frequency (τf) of + 4.8 ppm/°C. Based on the developed ceramic, a resonator operating at 6.5 GHz with a Q factor exceeding 8000 was designed and fabricated. The excellent agreement between HFSS simulations and experimental measurements confirms the material’s performance and demonstrates its strong potential for application in 5G and future 6G communication systems.