教師資料查詢 | 類別: 期刊論文 | 教師: 林諭男 I-nan Lin (瀏覽個人網頁)

標題:Novel reaction mechanism for the synthesis of Ba2Ti9O20 materials prepared from nano-sized oxides
學年94
學期1
出版(發表)日期2006/01/14
作品名稱Novel reaction mechanism for the synthesis of Ba2Ti9O20 materials prepared from nano-sized oxides
作品名稱(其他語言)
著者林諭男; Lin, I-nan; 朱立文; Chu, Li-wen; Hsiue, Ging-ho; Lin, I-nan; Chen, Yi-chun
單位淡江大學物理學系
出版者Institute of Physics (IOP)
著錄名稱、卷期、頁數Nanotechnology 17(1), pp.185-191
摘要In this work, the phase evolution during calcinations of a BaTiO3 and TiO2 mixture was investigated. Based on the observations, a model for the reaction sequence of the phases was proposed and a modified process was suggested, namely to synthesize Ba2Ti9O20 materials utilizing a BaTi4O9 and BaTi5O11 mixture, instead of a BaTiO3 and TiO2 mixture, as starting materials. The phase transformation kinetics is thus greatly enhanced by this process. While the reaction of the 2BaTiO3+7TiO2 mixture requires 1100 °C/4 h to transform completely into the Ba2Ti9O20 Hollandite-like phase, it needs only 1000 °C/4 h to fulfil the phase transformation process in the BaTi5O11+BaTi4O9 mixture. The BaTi5O11+BaTi4O9 mixture also leads to higher sinterability and more uniform granular structure, as compared to the 2BaTiO3+7TiO2 mixture, when these powder mixtures were densified by a direct sintering process. Furthermore, local microwave dielectric properties measured by an evanescent microwave probe (EMP) reveals that the grains of Ba2Ti9O20 materials prepared from the BaTi5O11+BaTi4O9 mixture possess larger dielectric constant than 2BaTiO3+7TiO2 derived ones, indicating that the BaTi5O11+BaTi4O9 mixture has higher reactivity for the formation of the Ba2Ti9O20 Hollandite-like phase.
關鍵字
語言英文
ISSN0957-4484
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別英國
公開徵稿
出版型式,紙本
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