Microwave Dielectric Ceramics Li2MO4−TiO2 (M = Mo,W) with Low Sintering Temperatures |
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Authors: | Jing Guo Di Zhou Shen‐Li Zou Hong Wang Li‐Xia Pang Xi Yao |
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Affiliation: | 1. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, , Xi'an, Shaanxi, 710049 China;2. Micro‐optoelectronic Systems Laboratories, Xi'an Technological University, , Xi'an, Shaanxi, 710032 China |
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Abstract: | In this work, novel series of (1 ? x)Li2MO4–xTiO2 (M = Mo, W; x = 0.3, 0.4, 0.45, 0.5, 0.6) ceramics were developed for microwave dielectric application. They were prepared via the mixed‐oxide process and the phase composition, microstructures, sintering behaviors, and microwave dielectric properties were investigated. The X‐ray diffraction (XRD) pattern and scanning electron microscope analysis indicated that the Li2MO4 (M = Mo, W) did not react with rutile TiO2 and a stable two‐phase composite system Li2MO4–TiO2 (M = Mo, W) was formed. The XRD pattern of cofired ceramics revealed that some parts of Li2MoO4 phase and very small part of Li2WO4 phase react with Ag to form Ag2MoO4 phase and Ag2WO4 phase, respectively. At x = 0.45–0.5, temperature stable microwave dielectric materials with low sintering temperature (700°C–730°C) were obtained: εr = 10.6–11.0, Qf = 30 060–32 800 GHz, and temperature coefficient of resonant frequency ~0 ppm/°C. |
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