Journal ArticleDOI
Ionic occupation, structures, and microwave dielectric properties of Y3MgAl3SiO12 garnet‐type ceramics
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In this article, the Y3MgAl3SiO12 ceramics with pure phase were successfully synthesized by solid state sintering reaction method for the first time.Abstract:
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&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/Aloct)O6 octahedral and (Si/Altet)O4 tetrahedral units. The Qf and er 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 (er) of 10.1, Qf values of 57,340GHz (at 9.5 GHz), and τf values of -32 ppm/°C. Such properties indicate potential application of Y3MgAl3SiO12 as microwave substrates.
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Citations
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Vibrational spectroscopy and microwave dielectric properties of AY2Si3O10 (A=Sr, Ba) ceramics for 5G applications
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TL;DR: In this paper, the vibrational modes of [SiO4] tetrahedra, [YO6] octahedra and [(Sr/Ba)O8] polyhedra were analyzed by Raman spectroscopy.
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Cold sintered CaTiO3-K2MoO4 microwave dielectric ceramics for integrated microstrip patch antennas
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TL;DR: In this paper, a microstrip patch antenna was designed and fabricated using cold sintered CaTiO3-K2MoO4 (CTO-KMO) dielectric composites.
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Microwave dielectric properties and infrared reflectivity spectra analysis of two novel low-firing AgCa2B2V3O12 (B = Mg, Zn) ceramics with garnet structure
TL;DR: In this article, two Ag-containing microwave dielectric ceramics AgCa2B2V3O12 with garnet structure were prepared through solid-state reaction method.
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The effects of TiO2 addition on microwave dielectric properties of Y3MgAl3SiO12 ceramic for 5G application
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TL;DR: In this article, thermal stable Y3MgAl3SibO12-TiO2 microwave composite ceramics were firstly fabricated by the high temperature solid phase reaction method.
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Journal ArticleDOI
Characterization and dielectric behavior of willemite and TiO2-doped willemite ceramics at millimeter-wave frequency
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Journal ArticleDOI
Surface-layer effect in CaCu3Ti4O12
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TL;DR: In this paper, low-frequency (∼100Hz) dielectric properties of CaCu3Ti4O12 were investigated in detail near room temperature, and the authors found that the surface-layer effect leads to the formation of surface layer, resulting in the observed Maxwell-Wagner-type Dielectric relaxation.