Low-temperature sintering and microwave dielectric properties of Li 2 Mg 3 ZrO 6 ceramics derived from high-energy ball
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Low‑temperature sintering and microwave dielectric properties of Li2Mg3ZrO6 ceramics derived from high‑energy ball milling Simei Zhai1 · Peng Liu1,2 · Liping Zhao1 · Zhifen Fu3 Received: 22 November 2019 / Accepted: 22 January 2020 / Published online: 12 February 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The effects of synthesis temperature, milling time and dwell time on phase formation and phase constitutes of L i2CO3–MgO– ZrO2 mixtures were investigated by high-energy ball milling (HEBM). The L i2Mg3ZrO6 (LMZ) nanopowders were obtained from the mixtures by HEBM 20 h and calcined at 900 °C for 2 h, 300 °C lower than that required by a conventional ball milling method. The sintering characteristics, microstructures and microwave dielectric properties of Li2Mg3ZrO6 ceramics doped with x wt% LiF (0 ≤ x ≤ 8) were investigated. Addition of 6 wt% LiF reduced the sintering temperature of Li2Mg3ZrO6 ceramics to 850 °C, with the fantastic microwave dielectric properties: εr = 12.94, Q f = 131,420 GHz, τf = − 35.84 ppm/°C. The good effect of LiF on sintering process is due to substitution of F− for O2− and liquid-sintered process.
1 Introduction With the rapid development of wireless communication technology, microwave dielectric ceramics have been paid more and more attention due to the increasing requirements for microwave applications. Microwave materials are required to have suitable permittivity (εr), high quality factor (Q × f > 10,000 GHz) for better selectivity, near-zero temperature coefficient of resonant frequency for stability and low sintering temperature (T
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