Ba2TiSi2O8 ceramics exhibit excellent thermal, electrical, and optical properties, offering great potential for functional applications. However, the dielectric properties of Ba2TiSi2O8 ceramics have not been systematically investigated. This study explores the structural and dielectric evolution of Sr-doped Ba2TiSi2O8 ceramics (0 ≤ x ≤ 1.6), with particular attention to phase composition, microstructure, and vibrational behavior. All compositions retained the tetragonal P4bm structure, while a gradual lattice contraction was observed with increasing Sr2+ content. This structural evolution is further supported by Raman spectroscopy, which revealed systematic blue shifts in the TiO5 and Si2O7 vibrational modes, indicating enhanced bond strength and increased lattice rigidity. These structural modifications promoted densification and microstructural uniformity. At x = 0.4, the ceramic exhibited high relative density (> 97.8%), uniform grains, and phase purity, resulting in superior dielectric performance (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">${\varepsilon }_{r}{\prime}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>ε</mi> <mi>r</mi> </msub> <mo>′</mo> </mrow> </math></EquationSource> </InlineEquation> = 12.53, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$Q\times f$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>Q</mi> <mo>×</mo> <mi>f</mi> </mrow> </math></EquationSource> </InlineEquation> = 2120 GHz, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">${\tau }_{f}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>τ</mi> <mi>f</mi> </msub> </math></EquationSource> </InlineEquation> = − 23.63 ppm/°C). In contrast, excessive Sr2+ content (x ≥ 0.8) induced abnormal grain growth and the emergence of secondary SrTiO3 phases, accompanied by increased dielectric loss. These findings elucidate the delicate balance between lattice modification and dielectric response in Sr-doped Ba2TiSi2O8 ceramics, offering valuable insight into the structural design of silicate-based microwave dielectric materials.

Effect of Sr doping on phase structure, microstructure, and dielectric properties of Ba₂TiSi₂O₈ ceramics

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发表日期：

2025年12月20日

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Zhuoheng Yu,
Xinyang Zhang,
Yuhang Wu,
Taihong Chen,
Wei Wen

摘要

Ba₂TiSi₂O₈ ceramics exhibit excellent thermal, electrical, and optical properties, offering great potential for functional applications. However, the dielectric properties of Ba₂TiSi₂O₈ ceramics have not been systematically investigated. This study explores the structural and dielectric evolution of Sr-doped Ba₂TiSi₂O₈ ceramics (0 ≤ x ≤ 1.6), with particular attention to phase composition, microstructure, and vibrational behavior. All compositions retained the tetragonal P4bm structure, while a gradual lattice contraction was observed with increasing Sr²⁺ content. This structural evolution is further supported by Raman spectroscopy, which revealed systematic blue shifts in the TiO₅ and Si₂O₇ vibrational modes, indicating enhanced bond strength and increased lattice rigidity. These structural modifications promoted densification and microstructural uniformity. At x = 0.4, the ceramic exhibited high relative density (> 97.8%), uniform grains, and phase purity, resulting in superior dielectric performance ( ${\varepsilon }_{r}{\prime}$ $ε_{r}'$ = 12.53, $Q\times f$ $Q \times f$ = 2120 GHz, ${\tau }_{f}$ $τ_{f}$ = − 23.63 ppm/°C). In contrast, excessive Sr²⁺ content (x ≥ 0.8) induced abnormal grain growth and the emergence of secondary SrTiO₃ phases, accompanied by increased dielectric loss. These findings elucidate the delicate balance between lattice modification and dielectric response in Sr-doped Ba₂TiSi₂O₈ ceramics, offering valuable insight into the structural design of silicate-based microwave dielectric materials.

Effect of Sr doping on phase structure, microstructure, and dielectric properties of Ba2TiSi2O8 ceramics

摘要

Effect of Sr doping on phase structure, microstructure, and dielectric properties of Ba₂TiSi₂O₈ ceramics