Ionic occupation, structures, and microwave dielectric properties of Y3MgAl3SiO12 garnet-type ceramics

被引：71

作者：

Song, Jianbing ^{[1
]}

Song, Kaixin ^{[1
]}

Wei, Jinsheng ^{[1
]}

Lin, Huixin ^{[2
]}

Wu, Jun ^{[1
]}

Xu, Junming ^{[1
]}

Su, Weitao ^{[3
]}

Cheng, Zhiqun ^{[1
]}

机构：

[1] Hangzhou Dianzi Univ, Coll Elect Informat & Engn, Hangzhou, Zhejiang, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai, Peoples R China

[3] Hangzhou Dianzi Univ, Coll Mat Sci & Environm Eng, Hangzhou, Zhejiang, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2018年 / 101卷 / 01期

基金：

中国国家自然科学基金;

关键词：

dielectric materials/properties; electroceramics; microstructure; yttrium aluminum garnet;

D O I：

10.1111/jace.15174

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：244 / 251

页数：8

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