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Novel Low-Permittivity, Low-Sintering-Temperature Na₂WO₄ Microwave Dielectric Ceramics for LTCC Applications

H.L. Dong, H.L. Dong, C.X. Hu, C.X. Hu, W.J. Wang, H.P. Bao, W.J. Liu, B. Yang, B. Yang

Journal of Ceramic Science and Technology, Vol. 9, No. 4 (2018), pp. 471-476

DOI: 10.4416/JCST2018-00034

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Abstract

A novel Na2WO4 ceramic with low sintering temperature was successfully synthesized by means of the reactive sintering process. The phase composition, microstructure and microwave dielectric properties of the Na2WO4 dielectric ceramic with different sintering temperature (600, 650, 680 and 700 °C) were investigated in detail using X-ray diffraction (XRD), scanning electron microscopy (SEM) and a vector network analyzer, respectively. Excellent microwave dielectric properties with a relative permittivity (εr) ∼ 3.45, a quality factor (Q×f) ∼ 38 244 GHz (at 13.64 GHz) and a temperature coefficient of resonant frequency (τf) ∼ -42 ppm/K was obtained at a sintering temperature of 680 °C for 2 h. The results indicate that the Na2WO4 ceramic is a promising candidate for low-temperature co-fired ceramic technology.

Keywords

Microwave dielectric properties, low sintering temperature, Na2WO4, reactive sintering process

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