Abstract
In this study, MgxY3-xAl5-xSixO12 (x = 0–0.6) ceramics were prepared via a high-temperature solid state method. Mg2+ and Si4+ replacing Y3+ ions at A-site and Al3+ at C-site in garnet-type Y3Al5O12 (YAG) ceramics were designed to discuss the effects of crystal structure, microstructure on microwave dielectric properties for the first time. Liquid phase sintering induced by doping of Mg2+-Si4+, significantly decreased the sintering temperature and time for the densification of YAG ceramics. X-ray diffraction of the samples showed single phase for x ≤ 0.5, while a secondary phase of MgAl2O4 formed for x = 0.6. From the Rietveld analysis, a decrease in lattice dimensions, bond length and valence and rattling effect were observed, while Raman results showed a change in FWHM of the Eg mode. Based on these parameters, a structure–property relation was developed for MgxY3-xAl5-xSixO12 ceramics. Specially, Mg0.1Y2.9Al4.9Si0.1O12 showed a good set of microwave dielectric properties sintered at 1575 °C for 4 h with εr = 10.67, Q × f = 58,799 GHz, τf = -29.5 ppm/°C.
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This work was supported by the Natural Science Foundation of China under grant numbers: 51672063 and 52161145401, and the Program for Jiaxing Leading Innovative and Entrepreneurial Teams, and Project of Ministry of Science and Technology (Grant D20011), and the Guangdong Key Platform & Programs of the Education Department of Guangdong Province for funding under Grant No.2021ZDZX1003.
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Li, C., Hou, J., Ye, Z. et al. Lattice occupying sites and microwave dielectric properties of Mg2+–Si4+ co-doped MgxY3-xAl5-xSixO12 garnet typed ceramics. J Mater Sci: Mater Electron 33, 2116–2124 (2022). https://doi.org/10.1007/s10854-021-07417-w
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DOI: https://doi.org/10.1007/s10854-021-07417-w