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<p>To compensate for the large positive temperature coefficient of resonant frequency in the La<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> perovskite structure ceramic material, laminated&#xa0;La<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub>–Sm<sub>0.5</sub>Li<sub>0.5</sub>TiO<sub>3</sub> (LNT–SLT)&#xa0;microwave dielectric ceramic systems were designed with tunable layer mass fractions. Among the various compositions of&#xa0;<i>x</i>gLNT-(2−<i>x</i>)gSLT (<i>x</i> = 0.5, 0.6, 0.7, 0.8 and 0.9, where ‘g’ denotes grams) and&#xa0;sintering temperatures of 1200–1400&#xa0;°C, the most noteworthy results indicate that interfacial diffusion of A-site cations contributes to the development of a chemically graded region, which becomes more pronounced at higher sintering temperatures (1300–1400&#xa0;°C). Additionally, relatively higher sintering temperatures intensify this interfacial diffusion and structural disorder, ultimately leading to a decrease in <i>Q</i> × <i>f</i>&#xa0;values in the <i>x</i>gLNT-(2−<i>x</i>)gSLT (<i>x</i> = 0.7) from 1421.1 to 440.6&#xa0;GHz. Microwave dielectric measurements reveal that the temperature coefficient of frequency&#xa0;(τ<sub><i>f</i></sub>) varies&#xa0;approximately linearly&#xa0;with increasing LNT content, wherein the sample with <i>x</i> = 0.5 sintered at 1250&#xa0;°C for 4&#xa0;h achieves a near-zero <i>τ</i><sub><i>f</i></sub> value of approximately − 3.1&#xa0;ppm/°C and a high <i>ε</i><sub><i>r</i></sub> ~ 76.5, thus demonstrating superior temperature stability. Moreover, this study presents a promising strategy for the development of advanced bilayer ceramic systems and highlights their potential in communication devices.</p>

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Development of La0.5Na0.5TiO3–Sm0.5Li0.5TiO3 bilayer microwave ceramics with a linearly tunable temperature coefficient of resonant frequency

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Haoxuan Zhang,
  • Jingjing Qu,
  • Fei Liu,
  • Changlai Yuan,
  • Xiao Liu,
  • Yuntao Huang,
  • Qihan Chen,
  • Letian Liu

摘要

To compensate for the large positive temperature coefficient of resonant frequency in the La0.5Na0.5TiO3 perovskite structure ceramic material, laminated La0.5Na0.5TiO3–Sm0.5Li0.5TiO3 (LNT–SLT) microwave dielectric ceramic systems were designed with tunable layer mass fractions. Among the various compositions of xgLNT-(2−x)gSLT (x = 0.5, 0.6, 0.7, 0.8 and 0.9, where ‘g’ denotes grams) and sintering temperatures of 1200–1400 °C, the most noteworthy results indicate that interfacial diffusion of A-site cations contributes to the development of a chemically graded region, which becomes more pronounced at higher sintering temperatures (1300–1400 °C). Additionally, relatively higher sintering temperatures intensify this interfacial diffusion and structural disorder, ultimately leading to a decrease in Q × f values in the xgLNT-(2−x)gSLT (x = 0.7) from 1421.1 to 440.6 GHz. Microwave dielectric measurements reveal that the temperature coefficient of frequency (τf) varies approximately linearly with increasing LNT content, wherein the sample with x = 0.5 sintered at 1250 °C for 4 h achieves a near-zero τf value of approximately − 3.1 ppm/°C and a high εr ~ 76.5, thus demonstrating superior temperature stability. Moreover, this study presents a promising strategy for the development of advanced bilayer ceramic systems and highlights their potential in communication devices.