Synthesis of Ba2Ti9O20 materials via a dissolution-precipitation mechanism in a hydrothermal process

doi:10.1016/j.actamat.2005.11.037

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/27551

請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/27551

題名:	Synthesis of Ba2Ti9O20 materials via a dissolution-precipitation mechanism in a hydrothermal process
作者:	林諭男;Lin, I-nan;朱立文;Chu, Li-wen;Hsiue, Ging-ho
貢獻者:	淡江大學物理學系
關鍵詞:	Hydrothermal process;Dissolved Ti4+ species;Ba2Ti9O20
日期:	2006-04-01
上傳時間:	2009-12-31 10:21:26 (UTC+8)
出版者:	Elsevier
摘要:	A hydrothermal process has been successfully utilized for the preparation of Hollandite-like Ba2Ti9O20 precursors. Transmission electron microscopy in conjunction with chemical analyses of reacted powders indicate that Ti4+ species are first dissolved in the solution and then react with Ba2+ species to form perovskite-phased BaTiO3 in the hydrothermal process. An excessively large particle size for the starting TiO2 (anatase powders) results in insufficient Ti ions in the solvent and incomplete reaction with Ba2+ species, which leads to a Ba2+-deficient powder mixture. A residual TiO2 phase thus results after calcination. Only small TiO2 particles (40 nm) can result in sufficient Ti4+ species in the solution, which fully react with Ba2+ species and lead to a TiO2/BaTiO3 ratio of the correct stoichiometry to form Ba2Ti9O20. TiO2/BaTiO3 powder mixtures prepared in this way possess high activity and can be converted into pure Ba2Ti9O20 materials. After calcination and sintering processes, such materials possess high sintered density (∼93% TD) and good microwave dielectric properties (K = 36 and Q × f = 27,000).
關聯:	Acta Materialia 54(6), pp.1671-1677
DOI:	10.1016/j.actamat.2005.11.037
顯示於類別:	[物理學系暨研究所] 期刊論文

文件中的檔案:

檔案	大小	格式	瀏覽次數
	0Kb	Unknown	265	檢視/開啟
index.html	0Kb	HTML	161	檢視/開啟
Synthesis of Ba2Ti9O20 materials via a dissolution-precipitation mechanism in a hydrothermal process.pdf	732Kb	Adobe PDF	1	檢視/開啟

在機構典藏中所有的資料項目都受到原著作權保護.

TAIR相關文章

資料載入中.....