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Novel Low-Permittivity, Low-Sintering-Temperature Na2WO4 Microwave Dielectric Ceramics for LTCC Applications
H.L. Dong1,2, C.X. Hu2,3, W.J. Wang3, H.P. Bao1, W.J. Liu3, B. Yang2,4
1 School of Physics and Electronic Information Engineering, Qinghai Nationalities University, Xining 810007, China
2 School of Science, Xijing University, Xi'an 710123, China
3 Faculty of Science, Xi'an Aeronautical University, No. 259, West 2nd Ring, Xi'an, 710077, China.
4 Surface and Interface Science Laboratory, RIKEN 2 – 1 Hirosawa, Wako-shi, Saitama 351 – 0198, Japan
received April 15, 2018, received in revised form July 4, 2018, accepted July 23, 2018
Vol. 9, No. 4, Pages 471-476 DOI: 10.4416/JCST2018-00034
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.
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Keywords
Microwave dielectric properties, low sintering temperature, Na2WO4, reactive sintering process
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