The effects of synthesis temperature, milling time and dwell time on phase formation and phase constitutes of Li2CO3–MgO–ZrO2 mixtures were investigated by high-energy ball milling (HEBM). The Li2Mg3ZrO6 (LMZ) nanopowders… Click to show full abstract
The effects of synthesis temperature, milling time and dwell time on phase formation and phase constitutes of Li2CO3–MgO–ZrO2 mixtures were investigated by high-energy ball milling (HEBM). The Li2Mg3ZrO6 (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.
               
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