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Materials 2018, 11(1), 55; doi:10.3390/ma11010055

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

1
Department of Mechanical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Road, Sec. 4, Taipei 10607, Taiwan
2
Department of Electrical Engineering, National Taiwan University of Science and Technology, No. 43, Keelung Road, Sec. 4, Taipei 10607, Taiwan
3
Department of Mechanical Engineering, Ming Chi University of Technology, Taishan Dist., New Taipei City 24301, Taiwan
4
Prosperity Dielectric Company Limited, Taoyuan 338, Taiwan
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 17 December 2017 / Accepted: 26 December 2017 / Published: 29 December 2017
View Full-Text   |   Download PDF [2145 KB, uploaded 29 December 2017]   |  

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. View Full-Text
Keywords: microwave dielectrics; silver diffusion; glass-ceramics; diopside; co-fired silver electrode; low temperature co-fired ceramics microwave dielectrics; silver diffusion; glass-ceramics; diopside; co-fired silver electrode; low temperature co-fired ceramics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chou, C.-C.; Chang, C.-Y.; Chen, G.-Y.; Liao, W.-J.; Feng, K.-C.; Tsao, C.-Y. Control of Silver Diffusion in Low-Temperature Co-Fired Diopside Glass-Ceramic Microwave Dielectrics. Materials 2018, 11, 55.

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