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<p>This study modified the Co<sub>1.1</sub>Zn<sub>0.9</sub>TiO<sub>4</sub> ceramic system through Ba<sup>2</sup>⁺ ion doping to enhance the quality factor (<i>Q×f</i>) and adjust the <i>τ</i><sub><i>f</i></sub> value. Ceramic samples were prepared via the solid-state reaction method at sintering temperatures of 1125–1200°C. XRD revealed that at low Ba doping concentrations (<i>x</i> = 0–0.01), Ba<sup>2</sup>⁺ could partially substitute Zn<sup>2</sup>⁺, maintaining the cubic spinel main phase (Co<sub>2</sub>TiO<sub>4</sub>) structure; when <i>x</i> ≥ 0.02, the larger ionic radius of Ba<sup>2</sup>⁺ induced phase separation and the formation of a secondary BaTiO<sub>3</sub> phase, with the secondary-phase peak intensity increasing with doping concentration. The coexistence of main and secondary phases in the Co<sub>1.1</sub>Zn<sub>0</sub>.87Ba<sub>0</sub>.03TiO<sub>4</sub> ceramic was confirmed by Rietveld refinement. SEM demonstrated that appropriate Ba doping (<i>x</i> = 0.01–0.03) promoted grain growth, while excessive Ba doping (<i>x</i> = 0.04) led to microstructural deterioration. The <i>Q×f</i> value of the Co<sub>1.1</sub>Zn<sub>0</sub>.87Ba<sub>0</sub>.03TiO<sub>4</sub> ceramic increased to 66,943.2 GHz, while the <i>τ</i><sub><i>f</i></sub> value was adjusted to −17.13 ppm/°C, effectively reducing dielectric loss and enhancing temperature stability.</p>

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Enhanced microwave dielectric properties of Co1.1Zn0.9-xBaxTiO4 ceramics via Ba2+ ion substitution

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Xiaofei Shi,
  • Xi Wang,
  • Lei Wang,
  • Xiaoli Tang,
  • Hua Su,
  • Song Lizhong

摘要

This study modified the Co1.1Zn0.9TiO4 ceramic system through Ba2⁺ ion doping to enhance the quality factor (Q×f) and adjust the τf value. Ceramic samples were prepared via the solid-state reaction method at sintering temperatures of 1125–1200°C. XRD revealed that at low Ba doping concentrations (x = 0–0.01), Ba2⁺ could partially substitute Zn2⁺, maintaining the cubic spinel main phase (Co2TiO4) structure; when x ≥ 0.02, the larger ionic radius of Ba2⁺ induced phase separation and the formation of a secondary BaTiO3 phase, with the secondary-phase peak intensity increasing with doping concentration. The coexistence of main and secondary phases in the Co1.1Zn0.87Ba0.03TiO4 ceramic was confirmed by Rietveld refinement. SEM demonstrated that appropriate Ba doping (x = 0.01–0.03) promoted grain growth, while excessive Ba doping (x = 0.04) led to microstructural deterioration. The Q×f value of the Co1.1Zn0.87Ba0.03TiO4 ceramic increased to 66,943.2 GHz, while the τf value was adjusted to −17.13 ppm/°C, effectively reducing dielectric loss and enhancing temperature stability.