期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 101, 期 1, 页码 244-251出版社
WILEY
DOI: 10.1111/jace.15174
关键词
dielectric materials/properties; electroceramics; microstructure; yttrium aluminum garnet
资金
- National Natural Science Foundation of China [51672063, 51202051]
- Science and Technology Program of Zhejiang Province [2016C31110]
The Y3MgAl3SiO12 ceramics with pure phase were successfully synthesized by solid-state sintering reaction method for the first time. Their microwave dielectric properties were investigated as a function of sintering temperature. Their microstructure characteristics and ionic occupation sites of tetrahedral and octahedral units were characterized and analyzed by SEM& energy dispersive spectrometer (EDS) and Rietveld refinement of X-ray powder diffraction data. Crystal structure of Y3MgAl3SiO12 is isostructural to Y3Al5O12 with a cubic garnet structure and space group of Ia-3d, which contains YO8 dodecahedra, (Mg/Al-oct)O-6 octahedral, and (Si/Al-tet)O-4 tetrahedral units. The Qf and epsilon(r) values of different samples are strongly dependent on the distribution of grain sizes, grain sizes, and porosity. The samples sintered at 1550 degrees C exhibit optimized microwave dielectric properties with relative permittivity (epsilon(r)) of 10.1, Qf values of 57 340GHz (at 9.5 GHz), and tau(f) values of -32 ppm/degrees C. Such properties indicate potential application of Y3MgAl3SiO12 as microwave substrates.
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