| Summary: | 碩士 === 明志科技大學 === 機械工程系機械與機電工程碩士班 === 107 === Glass-ceramic materials reveal the excellent millimeter-wave dielectric properties for LTCC devices for the 5G system. However, the mechanisms and characteristics of silver diffusions are not precise while glass-ceramics co-fired with the silver electrodes. In this study, the behaviors and inhibitions of silver diffusions will be investigated into diopside glass-ceramics (CaMgSi2O6) with 0wt%~2wt% SiO2 additions co-fired with silver electrodes.
The DSC results show nucleation and crystal growth temperature of CaMgSi2O6 are at 900℃~930℃. Moreover, the additions of SiO2 promote the transition temperatures of CaMgSi2O6 to increase, which demonstrates the high activation energies of viscosities in the glass-ceramics with SiO2 additions. EPMA-WDS mappings show extreme inter-diffusions of Ag and Zn in the CaMgSi2O6 without SiO2 addition. However, CaMgSi2O6 with SiO2 additions exhibit low inter-diffusions of Ag and Zn, indicating SiO2 additions in the CaMgSi2O6 inhibit the diffusions of Ag and Zn. SEM-WDS mappings illustrate high contents of Ca, Mg congest around the SiO2 particle and gradually decrease in the heart of the SiO2 particle, besides, Si ions from the SiO2 particle diffuse into the material, furthermore, TEM data exhibit the similar phenomenon. Silver diffusions in the CaMgSi2O6 substrates do not affect millimeter wave dielectric properties dramatically at 30GHz~90GHz. Besides, the CaMgSi2O6 with SiO2 additions co-fired with Ag electrodes exhibit better microwave dielectric properties of silver electrodes and S11 data than materials without SiO2 addition, indicating the high potential for applications in 5G communication components.
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