Effect of milling process on the microwave dielectric properties of Ba 2Ti9O20 materials

Chi Ben Chang, Keh Chyang Leou, Chi-Ta Chia, Cheng Sao Cheng, Chen Chia Chou, I. Nan Lin

研究成果: 雜誌貢獻文章

摘要

The effects of the milling process on the characteristics of Ba 2Ti9O20 materials were investigated. The chemical analyses using transmission electron microscopy (EDAX in TEM) revealed that the SiO2 species incorporated into the Ba2Ti 9O20 materials were expelled by the Ba2Ti 9O20 grains. It induced the dissociation of the Ba 2Ti9O20 materials near the grain boundaries and degraded the microwave dielectric properties of the materials. The same phenomenon was assumed to be the procedure by which the high-energy-milling (HEM) process using Si3N4 grinding media (Si 3N4-HEM) deleteriously influenced the microwave dielectric properties for the Ba2Ti9O20 materials. Utilizing the three-dimensional-milling (3DM) process in place of the Si 3N4-HEM one markedly improved the characteristics of the Ba2Ti9O20 materials. The 3DM-processed samples own the same crystallinity as the HEM-processed ones but possess a pronouncedly more uniform microstructure and, therefore, exhibit a superior quality factor [(Q × f)3DM ≤ 28 500 GHz and (Q × f)HEM ≤ 21,900 GHz] with the same large dielectric constant (K ≤ 38-39), when sintered at the same conditions (1350 °C/4 h). Such a phenomenon is ascribed to the fact that the 3DM process can pulverize the powders efficiently but induce no SiO2-contamination.

原文英語
文章編號024
頁(從 - 到)4457-4465
頁數9
期刊Journal of Physics D: Applied Physics
39
發行號20
DOIs
出版狀態已發佈 - 2006 十月 21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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