Synthesis, phase composition and modified microwave dielectric properties of Mg2+ substituted Zn2SiO4 ceramics with uniform microstructure

2019 ◽  
Vol 6 (10) ◽  
pp. 106313 ◽  
Author(s):  
Zejun Ye ◽  
Jie Li ◽  
Gang Wang ◽  
Zhenfeng Qi ◽  
Gongwen Gan ◽  
...  
Keyword(s):  
Phase Composition ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
Uniform Microstructure

Crystal structure, phase composition and microwave dielectric properties of Ca3MSi2O9 ceramics

2018 ◽  
Vol 750 ◽  
pp. 996-1002 ◽  
Author(s):  
Xiao-Qiang Song ◽  
Kang Du ◽  
Xian-Zhe Zhang ◽  
Jie Li ◽  
Wen-Zhong Lu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
Structure Phase

Phase composition and microwave dielectric properties of low-firing Li2A2W3O12 (A = Mg, Zn) ceramics

2015 ◽  
Vol 26 (8) ◽  
pp. 5892-5895 ◽  
Author(s):  
Liang Fang ◽  
Zhenhai Wei ◽  
Huanhuan Guo ◽  
Yihua Sun ◽  
Ying Tang ◽  
...  
Keyword(s):  
Phase Composition ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric

Low-Temperature Firing and Microwave Dielectric Properties of Zn3Nb2O8 Ceramics with CuO-V2O5-Bi2O3

2010 ◽  
Vol 434-435 ◽  
pp. 224-227
Author(s):  
Xu Ping Lin ◽  
Jing Tao Ma ◽  
Bao Qing Zhang ◽  
Ji Zhou
Keyword(s):  
Dielectric Constant ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Relative Density ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
Co Doping ◽  
Microwave Dielectric ◽  
Quality Factor Q

The influence of CuO-V2O5-Bi2O3 addition on the sintering behavior, phase composition, microstructure and microwave dielectric properties of Zn3Nb2O8 ceramics were investigated. The co- doping of CuO, V2O5 and Bi2O3 can significantly lower the sintering temperature of Zn3Nb2O8 ceramics from 1150°C to 900°C. The Zn3Nb2O8-0.5wt% CuO-0.5wt% V2O5-2.0wt% Bi2O3 ceramic sintered at 900°C showed a relative density of 97.1%, a dielectric constant (εr) of 18.2, and a quality factor (Q×f) of 36781 GHz. The dielectric properties in this system exhibited a significant dependence on the relative density, content of additives and sintering temperature. The relative density and dielectric constant (εr) of Zn3Nb2O8 ceramics increased with increasing CuO-V2O5-Bi2O3 additions. And also the relative density and dielectric constant of Zn3Nb2O8 ceramics increased by the augment of the sintering temperature.

Investigation of phase composition and microwave dielectric properties of MgO-Ta2 O5 ceramics with ultrahigh Qf value

2018 ◽  
Vol 101 (7) ◽  
pp. 3026-3031 ◽  
Author(s):  
Mingzhao Dang ◽  
Haishen Ren ◽  
Xiaogang Yao ◽  
Haiyi Peng ◽  
Tianyi Xie ◽  
...  
Keyword(s):  
Phase Composition ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric

Phase composition, crystal structure and microwave dielectric properties of Mg2−Cu SiO4 ceramics

2018 ◽  
Vol 38 (4) ◽  
pp. 1508-1516 ◽  
Author(s):  
Yuanming Lai ◽  
Xiaoli Tang ◽  
Xin Huang ◽  
Huaiwu Zhang ◽  
Xiaofeng Liang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric

Low Temperature Sintering of BaO–ZnO–TiO2 Ceramics for LTCC Applications

2012 ◽  
Vol 476-478 ◽  
pp. 917-922 ◽  
Author(s):  
Sheng Quan Yu ◽  
Shu Meng Sun ◽  
Bin Tang ◽  
Shu Ren Zhang
Keyword(s):  
Phase Composition ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Sintering Aids ◽  
Promising Candidate ◽  
High Q ◽  
Microwave Dielectric ◽  
Ag Electrodes

In order to develop a new middle dielectric constant LTCC materials, the effects of BaO–ZnO–TiO2–B2O3–SiO2(BZTBS) and/or BaCu(B2O5)(BCB2) on the phase composition, microstructure and microwave dielectric properties of BaO–ZnO–TiO2 ceramics were investigated by solid-state reaction. It was found that BCB2 mainly worked as sintering aids to lower the sintering temperature and the key role of BZTBS was to affect the phase composition in favour of showing a high Q×f value. Therefore, when 5wt% BZTBS+6wt% BCB2 were co-doped, the sintering temperature was down to 850°C, and the microwave dielectric properties were improved significantly because the densification and grain size distribution were not only improved but also the phase composition was controlled. At last, this ceramics sintered at 850°C for 0.5 h showed good microwave dielectric properties: εr=28.4, Q×f=8,030 GHz and τf=2 ppm/°C. Also, it was compatible with Ag electrodes, so it was a promising candidate for LTCC application.

Structure and microwave dielectric properties of (Zn1−xNix)TiO3 ceramics

2003 ◽  
Vol 18 (5) ◽  
pp. 1067-1072 ◽  
Author(s):  
Hyo Tae Kim ◽  
Joon-Cheol Hwang ◽  
Joong-Hee Nam ◽  
Byung Hyun Choi ◽  
Michael T. Lanagan
Keyword(s):  
Dielectric Constant ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Phase Distribution ◽  
Spinel Phase ◽  
Measurement Techniques ◽  
Microwave Dielectric Properties ◽  
Rutile Phase ◽  
Microwave Measurement ◽  
Microwave Dielectric

Dielectric ceramics in the system (Zn1−xNix)TiO3, x = 0 to 1 were synthesized by the solid-state reaction route. The phase distribution, microstructure, and dielectric properties were characterized using powder x-ray diffraction analysis, electron microscopy, and microwave measurement techniques. Three phase composition regions were identified in the specimens sintered at 1150 °C: [spinel + rutile] at 0 ≤ x ≤ 0.5, [spinel + ilmenite + rutile] at 0.5 < x ≤ 0.8, and [ilmenite] phase at 0.8 < x ≤ 1. For the 0 ≤ x ≤ 0.5 region, the amount of Ti-rich precipitates incorporated into the spinel phase decreased with the Ni content at 0 ≤ x ≤ 0.5, with a concomitant increase of the rutile phase. The microwave dielectric properties depended on the phase composition and volume according to the three typical phase regions, where the relative amount of rutile to the spinel or ilmenite determined the dielectric properties. The dielectric constant as a function of Ni addition was modeled with a Maxwell mixing rule. An optimum phase distribution was determined in this system with dielectric constant of 22, a Q × f of 60,000, and a low temperature coefficient of the resonant frequency.

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