Publication Date:
2017-08-19
Description:
The Y 3 MgAl 3 SiO 12 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&EDS and Rietveld refinement of X-ray powder diffraction data. Crystal structure of Y 3 MgAl 3 SiO 12 is isostructural to Y 3 Al 5 O 12 with a cubic garnet structure and space group of Ia-3d, which contains YO 8 dodecahedra, (Mg/Al oct )O 6 octahedral and (Si/Al tet )O 4 tetrahedral units. The Qf and ε r values of different samples are strongly dependent on the distribution of grain sizes, grain sizes, and porosity. The samples sintered at 1550°C exhibit optimized microwave dielectric properties with relative permittivity (ε r ) of 10.1, Qf values of 57,340GHz (at 9.5 GHz), and τ f values of -32 ppm/°C. Such properties indicate potential application of Y 3 MgAl 3 SiO 12 as microwave substrates. This article is protected by copyright. All rights reserved.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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