Scholarlink

<p>This study presents a co-doped ilmenite-structured dielectric ceramic system, [(Mg<sub>1−<i>x</i></sub>Ni<sub><i>x</i></sub>)<sub>0.95</sub>Mn<sub>0.05</sub>]TiO<sub>3</sub> (MNMT), optimized for low-loss and thermally stable performance at reduced sintering temperatures. Ni<sup>2+</sup> doping promotes lattice contraction and crystallinity enhancement, while Mn<sup>2+</sup> improves densification and sintering behavior. The composition [(Mg<sub>0.8</sub>Ni<sub>0.2</sub>)<sub>0.95</sub>Mn<sub>0.05</sub>]TiO<sub>3</sub>, sintered at 1300&#xa0;°C for 2&#xa0;h, achieved ε<sub>r</sub> ~ 17.4, <i>Qf</i> ~ 230,000&#xa0;GHz, and τ<sub><i>f</i></sub> ~ − 52 ppm/°C. Phase purity and structural homogeneity were confirmed via XRD, XPS, Raman spectroscopy, and SEM/EDS analyses. To address the strongly negative τ<sub><i>f</i></sub>, CaTiO<sub>3</sub> was incorporated into the MNMT matrix. The optimized (1 − <i>x</i>)MNMT–<i>x</i>CaTiO<sub>3</sub> composition with <i>x</i> = 0.06 exhibited a balanced dielectric performance (ε<sub>r</sub> ~ 20.88, <i>Qf</i> ~ 100,000&#xa0;GHz) and complete τ<sub><i>f</i></sub> compensation (~ 0 ppm/°C), sintered at 1325&#xa0;°C for 2&#xa0;h. The absence of secondary phases and the maintenance of dense microstructures confirmed the solid-state compatibility between MNMT and CaTiO<sub>3</sub>. This dual design strategy offers a viable route toward high-Q and thermally compensated dielectrics for microwave, 5G, and B5G system integration.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Temperature-stable and low-loss microwave dielectrics based on [(Mg0.8Ni0.2)0.95Mn0.05]TiO3–CaTiO3 for 5G applications

  • 期刊论文

  • 发表日期：

    2026年4月20日

查看全文
  • Che-Hao Liao,
  • Cheng-Che Ho,
  • Ruei-Sung Yu,
  • Yao-Chin Wang,
  • Po-Cheng Chen,
  • Shih-Hung Lin

摘要

This study presents a co-doped ilmenite-structured dielectric ceramic system, [(Mg1−xNix)0.95Mn0.05]TiO3 (MNMT), optimized for low-loss and thermally stable performance at reduced sintering temperatures. Ni2+ doping promotes lattice contraction and crystallinity enhancement, while Mn2+ improves densification and sintering behavior. The composition [(Mg0.8Ni0.2)0.95Mn0.05]TiO3, sintered at 1300 °C for 2 h, achieved εr ~ 17.4, Qf ~ 230,000 GHz, and τf ~ − 52 ppm/°C. Phase purity and structural homogeneity were confirmed via XRD, XPS, Raman spectroscopy, and SEM/EDS analyses. To address the strongly negative τf, CaTiO3 was incorporated into the MNMT matrix. The optimized (1 − x)MNMT–xCaTiO3 composition with x = 0.06 exhibited a balanced dielectric performance (εr ~ 20.88, Qf ~ 100,000 GHz) and complete τf compensation (~ 0 ppm/°C), sintered at 1325 °C for 2 h. The absence of secondary phases and the maintenance of dense microstructures confirmed the solid-state compatibility between MNMT and CaTiO3. This dual design strategy offers a viable route toward high-Q and thermally compensated dielectrics for microwave, 5G, and B5G system integration.