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Materials (Basel). 2017 Dec 29;11(1). pii: E55. doi: 10.3390/ma11010055.

Control of Silver Diffusion in Low-Temperature Co-Fired Diopside Glass-Ceramic Microwave Dielectrics.

Author information

1
Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Road, Sec. 4, Taipei 10607, Taiwan. ccchou@mail.ntust.edu.tw.
2
Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Road, Sec. 4, Taipei 10607, Taiwan. adimini08@gmail.com.
3
Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Road, Sec. 4, Taipei 10607, Taiwan. tp609803167@gmail.com.
4
Department of Electrical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Road, Sec. 4, Taipei 10607, Taiwan. wjliao@mail.ntust.edu.tw.
5
Department of Mechanical Engineering, Ming Chi University of Technology, Taishan Dist., New Taipei City 24301, Taiwan. kwechin@mail.mcut.edu.tw.
6
Prosperity Dielectric Company Limited, Taoyuan 338, Taiwan. alberttsao@pdc.com.tw.

Abstract

Electrode material for low-temperature co-fired diopside glass-ceramic used for microwave dielectrics was investigated in the present work. Diffusion of silver from the electrode to diopside glass-ceramics degrades the performance of the microwave dielectrics. Two approaches were adopted to resolve the problem of silver diffusion. Firstly, silicon-oxide (SiO₂) powder was employed and secondly crystalline phases were chosen to modify the sintering behavior and inhibit silver ions diffusion. Nanoscale amorphous SiO₂ powder turns to the quartz phase uniformly in dielectric material during the sintering process, and prevents the silver from diffusion. The chosen crystalline phase mixing into the glass-ceramics enhances crystallinity of the material and inhibits silver diffusion as well. The result provides a method to decrease the diffusivity of silver ions by adding the appropriate amount of SiO₂ and appropriate crystalline ceramics in diopside glass-ceramic dielectric materials. Finally, we used IEEE 802.11a 5.8 GHz as target specification to manufacture LTCC antenna and the results show that a good broadband antenna was made using CaMgSi₂O₆ with 4 wt % silicon oxide.

KEYWORDS:

co-fired silver electrode; diopside; glass-ceramics; low temperature co-fired ceramics; microwave dielectrics; silver diffusion

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