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<p>A new low-temperature co-fired ceramic (LTCC) Li<sub>2</sub>Sr<sub>1-x</sub>Ca<sub>x</sub>SiO<sub>4</sub> with low-temperature co-firing characteristics and high Q factor was synthesized via the solid-state reaction method through minor substitution of a single ion. XRD results revealed that Li<sub>2</sub>Sr<sub>1-x</sub>Ca<sub>x</sub>SiO<sub>4</sub> ceramics form the hexagonal Li<sub>2</sub>SrSiO<sub>4</sub> phase with space group <i>P3</i><sub>1</sub><i>21</i>, accompanied by the formation of the secondary Sr<sub>2</sub>SiO<sub>4</sub> phase with space group <i>Pnma</i>. Raman spectroscopy analysis indicated that the optimal performance is achieved at <i>x</i> = 0.07, which is consistent with the findings from the network analyzer. Additionally, SEM characterization of the ceramic morphology showed that the density is consistent with the aforementioned results. For Li<sub>2</sub>Sr<sub>0.93</sub>Ca<sub>0.07</sub>SiO<sub>4</sub> ceramics sintered at 950&#xa0;°C, the microwave dielectric properties are as follows: Relative permittivity (ɛ<sub>r</sub>) = 8.3919, quality factor multiplied by frequency (Q × <i>f</i>) = 58,779&#xa0;GHz, and temperature coefficient of resonance frequency (τ<sub><i>f</i></sub>) = −&#xa0;147.8296&#xa0;ppm/&#xa0;°C. Finally, the sintering characteristics of the ceramic were further elaborated using PVL theory. Li<sub>2</sub>Sr<sub>0.93</sub>Ca<sub>0.07</sub>SiO<sub>4</sub> ceramics can serve as a candidate dielectric material for low-temperature co-firing (LTCC) applications.</p>

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Microwave dielectric properties of Ca2⁺-substituted Li₂SrSiO₄ ceramics: investigation via Raman, SEM, and P–V–L theory

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Yuan-Bin Chen,
  • Xiuyuan Su

摘要

A new low-temperature co-fired ceramic (LTCC) Li2Sr1-xCaxSiO4 with low-temperature co-firing characteristics and high Q factor was synthesized via the solid-state reaction method through minor substitution of a single ion. XRD results revealed that Li2Sr1-xCaxSiO4 ceramics form the hexagonal Li2SrSiO4 phase with space group P3121, accompanied by the formation of the secondary Sr2SiO4 phase with space group Pnma. Raman spectroscopy analysis indicated that the optimal performance is achieved at x = 0.07, which is consistent with the findings from the network analyzer. Additionally, SEM characterization of the ceramic morphology showed that the density is consistent with the aforementioned results. For Li2Sr0.93Ca0.07SiO4 ceramics sintered at 950 °C, the microwave dielectric properties are as follows: Relative permittivity (ɛr) = 8.3919, quality factor multiplied by frequency (Q × f) = 58,779 GHz, and temperature coefficient of resonance frequency (τf) = − 147.8296 ppm/ °C. Finally, the sintering characteristics of the ceramic were further elaborated using PVL theory. Li2Sr0.93Ca0.07SiO4 ceramics can serve as a candidate dielectric material for low-temperature co-firing (LTCC) applications.