Two novel low permittivity microwave dielectric ceramics Li2TiMO5 (M = Ge, Si) with abnormally positive τf

被引：40

作者：

Cheng, Kai ^{[1
,2
]}

Tang, Ying ^{[2
]}

Xiang, Huaicheng ^{[2
]}

Li, Chunchun ^{[2
,3
]}

Fang, Liang ^{[1
,2
]}

Sun, Yihua ^{[1
]}

机构：

[1] China Three Gorges Univ, Coll Mat & Chem Engn, Key Lab Inorgan Nonmetall Crystalline & Energy Co, Yichang 443002, Peoples R China

[2] Guilin Univ Technol, Coll Mat Sci & Engn, Guangxi Key Lab Opt & Elect Mat & Devices, Guilin 541004, Peoples R China

[3] Guilin Univ Technol, Coll Informat Sci & Engn, Guilin 541004, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2019年 / 39卷 / 08期

关键词：

Ceramics; Natisite structure; Dielectric properties; Radio and microwave frequency region; CRYSTAL-STRUCTURE; BOND-VALENCE; TEMPERATURE;

D O I：

10.1016/j.jeurceramsoc.2019.03.017

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：

Two tetragonal natisite structured Li2TiMO5 (M = Ge, Si) ceramics fabricated using the conventional solid-state reaction method were investigated in terms of the thermal stability, sintering behavior and dielectric properties at radio (RF) and microwave frequency region. At the optimum sintering temperature of 1140 degrees C, Li2TiGeO5 (LTG) has epsilon(r) (similar to) 9.43, Q x f (similar to) 65,300 GHz (at 14.7 GHz), and tau(f) (similar to) + 24.1 ppm/C, while Li2TiSiO5 (LTS) sintered at 1180 degrees C exhibits epsilon(r) (similar to) 9.89, Q x f(similar to) 38,100 GHz (at 14.2 GHz), and tau(f) (similar to) + 50.1 ppm/degrees C. The positive tau(f) values of the present LTG and LTS are abnormal and extremely important for low-epsilon(r) microwave dielectric ceramics, which could behave as a promising tau(f) compensator. Moreover, the dielectric spectra of both ceramics revealed a phase transition at low-temperature, exhibiting a dielectric peak, which could account for the negative tau(epsilon) and positive tau(f) in operating temperature ranges.

引用

页码：2680 / 2684

页数：5

共 23 条

[21] Glass-free low-temperature cofired ceramics: calcium germanates, silicates and tellurates [J].