scholarly journals BiVO4 based high k microwave dielectric materials: a review

2018 ◽  
Vol 6 (35) ◽  
pp. 9290-9313 ◽  
Author(s):  
Di Zhou ◽  
Li-Xia Pang ◽  
Da-Wei Wang ◽  
Ian M. Reaney
Keyword(s):  
Solid Solution ◽  
Temperature Coefficient ◽  
Sintering Temperature ◽  
Dielectric Materials ◽  
Zero Temperature ◽  
Composite Ceramics ◽  
Microwave Dielectric ◽  
High K ◽  
Low Sintering Temperature ◽  
A Site

We precis recent studies on doped BiVO4 ceramics in terms of A site, B site and A/B site complex substitutions. Low sintering temperature (<800 °C), high εr and near zero temperature coefficient values could be obtained in solid solution and composite ceramics.

Preparation and Characterization of Citrate Sol-Gel Derived CaLa4Ti4O15 Microwave Dielectric Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 167-169
Author(s):  
Jing Pei ◽  
Zhen Xing Yue ◽  
Fei Zhao ◽  
Wei Li ◽  
Zhi Lun Gui ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Temperature Coefficient ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Microwave Dielectric Ceramics ◽  
Zero Temperature ◽  
Microwave Dielectric ◽  
Dielectric Ceramics ◽  
Calcined Temperature

In this work hexagonal perovskite powders of CaLa4Ti4O15 were prepared by citrate sol-gel method. The calcined temperature was 1150oC, which is lower than that of the conventional solid method. Dense CLT ceramics were produced at sintering temperature of 1600oC. The crystal structures and microstructures were investigated by XRD, TEM and SEM, respectively. Compared with samples produced by solid method, the sol-gel derived CLT ceramics exhibited a near zero temperature coefficient of resonant frequency (τf ) of -6 ppm/oC, and other microwave properties , εr ~ 43, Q×f ~ 42000 GHz were also obtained. Moreover, the sintering temperature of the CLT ceramics could be reduced to 1400 oC by addition of B2O3-ZnO.

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