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<p>In this communication, structural, microstructural, and microwave dielectric properties of the (Mg<sub>1−<i>x</i></sub>Ni<sub><i>x</i></sub>)<sub>2</sub>TiO<sub>4</sub> (<i>x</i> = 0.00–0.08) ceramics prepared by a high-energy planetary ball milling (HEBM) technique are reported. All the as-prepared samples exhibit a cubic-structured which was confirmed by the X-ray diffraction patterns analysis through Rietveld refinement and the measured lattice parameters. A well-defined microstructure with maximum relative density about 98% is achieved for (Mg<sub>0.95</sub>Ni<sub>0.05</sub>)<sub>2</sub>TiO<sub>4</sub> ceramic along with an incredible reduction in sintering temperature from 1420 to 1300&#xa0;°C. It was observed that the relative density, dielectric constant, and <i>Q</i> × <i>f</i><sub>o</sub> values increase with increasing Ni-content up to 0.05 and decreases afterward. When concentration of <i>x</i> increases from 0.00 to 0.05, the <i>Q</i> × <i>f</i><sub>o</sub> value has tremendously boosted from 94,000 to 192,000&#xa0;GHz. A fine combination of microwave dielectric properties, (<i>ε</i><sub>r</sub> ≈ 15.8, <i>Q</i> × <i>f</i><sub>o</sub> = 192,000&#xa0;GHz at 10.24&#xa0;GHz) was achieved for (Mg<sub>0.95</sub>Ni<sub>0.05</sub>)<sub>2</sub>TiO<sub>4</sub> sample sintered at 1300&#xa0;°C for 3&#xa0;h. This is attributed to local distortion, highest relative density, and uniform grain growth of the specimen. In this study, ilmenite-structured (Mg<sub>0.95</sub>Ni<sub>0.05</sub>)TiO<sub>3</sub> was detected as a secondary phase. However, the existence of this secondary phase would cause no significant variation in the dielectric properties of the sample, because it possesses compatible properties as compared with the primary phase. The observed results reveal (Mg<sub>0.95</sub>Ni<sub>0.05</sub>)<sub>2</sub>TiO<sub>4</sub> ceramic can be proposed as one of the most promising dielectric materials for 5G wireless communications.&#xa0;</p>

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A comprehensive study on structure, microstructure and microwave-dielectric properties of (Mg1−xNix)2TiO4 ceramics (x = 0.00–0.08) for 5G wireless communications

  • 期刊论文

  • 发表日期：

    2025年11月28日

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  • Soniya Boro,
  • R. K. Bhuyan,
  • P. K. Swain,
  • S. K. Parida

摘要

In this communication, structural, microstructural, and microwave dielectric properties of the (Mg1−xNix)2TiO4 (x = 0.00–0.08) ceramics prepared by a high-energy planetary ball milling (HEBM) technique are reported. All the as-prepared samples exhibit a cubic-structured which was confirmed by the X-ray diffraction patterns analysis through Rietveld refinement and the measured lattice parameters. A well-defined microstructure with maximum relative density about 98% is achieved for (Mg0.95Ni0.05)2TiO4 ceramic along with an incredible reduction in sintering temperature from 1420 to 1300 °C. It was observed that the relative density, dielectric constant, and Q × fo values increase with increasing Ni-content up to 0.05 and decreases afterward. When concentration of x increases from 0.00 to 0.05, the Q × fo value has tremendously boosted from 94,000 to 192,000 GHz. A fine combination of microwave dielectric properties, (εr ≈ 15.8, Q × fo = 192,000 GHz at 10.24 GHz) was achieved for (Mg0.95Ni0.05)2TiO4 sample sintered at 1300 °C for 3 h. This is attributed to local distortion, highest relative density, and uniform grain growth of the specimen. In this study, ilmenite-structured (Mg0.95Ni0.05)TiO3 was detected as a secondary phase. However, the existence of this secondary phase would cause no significant variation in the dielectric properties of the sample, because it possesses compatible properties as compared with the primary phase. The observed results reveal (Mg0.95Ni0.05)2TiO4 ceramic can be proposed as one of the most promising dielectric materials for 5G wireless communications.