English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28588/40619
Visitors : 4115788      Online Users : 62
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search
LoginUploadHelpAboutAdminister

Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/26516

Title: Core–shell Structure of Strontium Titanate Self-grown by a Hydrothermal Process for Use in Grain Boundary Barrier Layers
Authors: Horng-Yi Chang;Syh-Yuh Cheng;Ching-Iuan Sheu;Yi-Hui Wang
Contributors: 國立臺灣海洋大學:輪機工程學系
Date: 2003
Issue Date: 2011-10-20T08:36:29Z
Publisher: Nanotechnology
Abstract: Abstract:A perovskite shell of strontium titanate (SrTiO3) has been successfully self-grown on the surface of a titanium (Ti) particle by a hydrothermal process using Sr(OH)28H2O and Ti powder with or without alkaline (NaOH) solution at a temperature of 150–200°C for 3 h. The obtained strontium titanate (ST) shell contained spherical grains. The shells' crystallinity, thickness and grain size increased with an increase in the hydrothermal growth temperature. The obtained shell grain size was estimated by transmission electron microscopy to be in the range 50–120 nm. The thickness of the spherical grain shell was about 400 nm for 3 h hydrothermal growth at 180°C and 600 nm for 3 h at 200°C. There was a transition zone of about 200 nm between the ST shell and the Ti core. The results are ascribed to diffusion of the Sr ions through the shell into the core to react with dissolved Ti ions in an oxygen-deficient environment. The self-grown ST–Ti was annealed in air after sintering at 1350°C in a reducing C/CO atmosphere. This produced a core–shell structure with an ST grain boundary barrier layer. The sintered and annealed body exhibited the good nonlinear resistance properties of a varistor.
Relation: 14(6), pp.603-608
URI: http://ntour.ntou.edu.tw/handle/987654321/26516
Appears in Collections:[輪機工程學系] 期刊論文

Files in This Item:

File Description SizeFormat
index.html0KbHTML243View/Open


All items in NTOUR are protected by copyright, with all rights reserved.

 


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback