The structure and microwave dielectric properties of Li2MoO4-SiO2 ceramics without addition of glass as sintering aids

Yuanming Lai; Xiaoli Tang; Huaiwu Zhang; Xiaofeng Liang; Xin Huang; Jie Li; Hua Su

doi:10.14723/tmrsj.43.1

Regular Papers

The structure and microwave dielectric properties of Li₂MoO₄-SiO₂ ceramics without addition of glass as sintering aids

Yuanming Lai, Xiaoli Tang, Huaiwu Zhang, Xiaofeng Liang, Xin Huang, Jie Li, Hua Su

著者情報

Yuanming Lai
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China
Xiaoli Tang
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China
Huaiwu Zhang
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China
Xiaofeng Liang
Analytical and Testing Center, Southwest University of Science and Technology
Xin Huang
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China
Jie Li
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China
Hua Su
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China

キーワード: Microwave dielectric ceramics, Structure, Dielectric properties, Raman spectroscopy

ジャーナルフリー

2018 年 43 巻 1 号 p. 1-5

DOI https://doi.org/10.14723/tmrsj.43.1

詳細

抄録

SiO₂ ceramic is one of the most important candidate materials for high-frequency microwave ceramics with very low dielectric constant (ε_r) at around 3.8 and low dielectric loss. However, a high sintering temperature must be provided during the preparation, which restricted their further application in low temperature co-fired ceramic (LTCC) field. In the present work, Li₂MoO₄-(1+δ)SiO₂ (δ = -0.5, -0.2, 0, 0.2, 0.5 mole) ceramics were prepared by solid-state reaction method and sintered at 800 °C. XRD, SEM, EDS and Raman spectroscopy techniques were used to study the phase composition and crystal structure. The ceramic samples were composed of both Li₂MoO₄ and SiO₂ phases. The ε_r values decrease with increased δ, which agree with the Lichtenecker logarithmic rule. The quality factor (Q×f) value initially increased and then decreased with increased δ. When evaluated as a microwave dielectric material, the Li₂MoO₄-(1+δ)SiO₂ ceramics show excellent dielectric performance with a low dielectric constant (ε_r = 4.807) and high Q×f values of ～21000 GHz at δ = 0 as sintered at 800 °C, which is a possible candidate for LTCC.

責任著者(Corresponding author)

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