Lattice evolution and microwave dielectric properties of La-doped yttrium aluminum garnet ceramics

被引：11

作者：

Zhou, Moke ^{[1
,3
]}

Chen, Hetuo ^{[2
,4
]}

He, Yi ^{[1
,3
]}

Zhou, Guohong ^{[2
]}

Zhang, Shuren ^{[1
,3
]}

Tang, Bin ^{[1
,3
,5
]}

机构：

[1] Univ Elect Sci & Technol China, Natl Engn Res Ctr Electromagnet Radiat Control Mat, Chengdu, Sichuan, Peoples R China

[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Device, Chengdu, Sichuan, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai, Peoples R China

[4] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine M, Shanghai 201899, Peoples R China

[5] Univ Elect Sci & Technol China, Natl Engn Res Ctr Electromagnet Radiat Control Mat, Chengdu 611731, Sichuan, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2023年 / 106卷 / 05期

基金：

中国国家自然科学基金;

关键词：

La2O3; doping; Lattice evolution; Microwave dielectric properties; YAG ceramics; CRYSTAL-STRUCTURE; BOND-VALENCE; ELECTRONIC-STRUCTURE; MORPHOLOGY; POWDER; TAU(F); MG; CA;

D O I：

10.1111/jace.18992

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：

In this study, Y3-xLaxAl5O12 (0 <= x <= 0.09) ceramics were synthesized, and the phase composition, lattice evolution, and microwave dielectric properties were investigated in detail. Scanning electron microscopy confirms that the addition of moderate amounts of La2O3 improves the grain development of YAG ceramics, but excessive doping destabilizes the crystal structure. Transmission electron microscopy characterization shows that the variation of the dielectric properties of the samples with x-value is related to the occurrence of benign dislocation structures caused by modifications in the type and content of the A-site rare-earth ions. The variations in relative density, dielectric constant, and quality factor remain basically coordinated. The optimum microwave dielectric properties of La3+ doped YAG samples are exhibited as epsilon(r) = 10.61, Q x f = 187, 542 GHz, tau(f) = -31.2 ppm/degrees C when La2O3 is doped at x = 0.015.

引用

页码：3252 / 3260

页数：9

共 47 条

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