A novel microwave dielectric ceramic CaB2O4 with low dielectric constant

被引：0
|
作者：
Zhang, Zhongquan [1 ]
Feng, Ruixuan [1 ]
Li, Bo [1 ,2 ,3 ]
机构：
[1] Univ Elect Sci & Technol China, Sch Integrated Circuit Sci & Engn, Chengdu, Peoples R China
[2] State Key Lab Elect Thin Films & Integrated Device, Chengdu, Peoples R China
[3] Natl Engn Res Ctr Electromagnet Radiat Control Mat, Chengdu, Peoples R China
来源：
PHYSICA B-CONDENSED MATTER | 2024年 / 695卷
关键词：
Borate; Microwave dielectric ceramic; P -V-L theory; CRYSTAL-STRUCTURE; TEMPERATURE; BA;
D O I：
10.1016/j.physb.2024.416526
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A novel microwave dielectric ceramic CaB2O4 with low dielectric constant was synthesized by the solid-state reaction method. The impact of diverse Ca/B ratios on the phase composition, microstructure and dielectric properties of CaB2+xO4+3x/2 (x = 0-0.6) ceramics was investigated. The bond ionicity and the lattice energy of CaB2+xO4+3x/2 ceramics were calculated by the P-V-L theory. The appropriate excess of boron facilitated the densification of CaB2O4 ceramics, resulting in the stable crystal structure and enhanced dielectric properties. CaB2.3O4.45 ceramic sintered at 950 degrees C had excellent properties: epsilon(r) = 6.03, Qxf = 37,962 GHz, and tau(f) = -24.7 ppm/degrees C. The influence of TiO2 on the microwave dielectric properties of CaB2O4 was investigated, 87 wt% CaB2O4 - 13 wt% TiO2 ceramics sintered at 950 degrees C showed a zero tau(f) value.
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页数：7
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