纳米 KTi6O13w合成中的形态演化和生长机理

doi:10.3724/SP.J.1077.2006.01325

无机材料学报

纳米 KTi₆O_13w合成中的形态演化和生长机理

徐艳姬^1,3, 徐明霞¹, 申玉田², 崔春翔³

(1. 天津大学材料学院, 天津 300072; 2. 清华大学材料系, 北京 100084; 3. 河北工业大学材料学院, 天津 300130)

收稿日期:2005-12-14 修回日期:2006-05-08 出版日期:2006-11-20 网络出版日期:2006-11-20

Morphologic Evolution and Growth Mechanism Involved in the Synthesis of Nanometer KTi₆O_13w

XU Yan-Ji ^1,3, XU Ming-Xia¹, SHEN Yu-Tian², CUI Chun-Xiang³

(1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China; 2. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 3. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China)

Received:2005-12-14 Revised:2006-05-08 Published:2006-11-20 Online:2006-11-20

摘要/Abstract

摘要： 以纳米TiO₂为原料, 通过煅烧反应制备了纳米KTi₆O₁₃晶须, 对晶须合成中温度和时间诱导的相变、形态演化和生长机理等进行了原位研究. 结果表明: 纳米TiO₂作原料可显著降低晶须合成温度, 适宜的煅烧温度为900~1100℃. 形态演化观察和高温XRD分析表明: KTi₆O₁₃晶须的相变及生长对温度极为敏感, 形态演化是基于初期爆发式的相变和随后串并联式的长大. KTi₆O₁₃晶须的生长遵守本研究提出的串并联机制, 晶须轴向的生长台阶是串并联生长的直接结果.

关键词: KTi6O13晶须, 形态演化, 生长机理

Abstract: The present work was aimed at in-situ studies of temperature and time induced phase transition, morphologic evolution, growth mechanism, and microstructure of KTi₆O₁₃ nano-whiskers synthesized by calcination reaction using nanometer TiO₂ as the starting material. The experimental results indicate that the use of nanometer TiO greatly reduces calcination temperature with a suitable calcination temperature range of 900~1100℃. Observation of morphologic evolution and dynamic HTXRD analysis show that the phase transition and growth of KTi₆O₁₃ whiskers are quite sensitive to calcination temperature, and the morphologic evolution of KTi₆O₁₃ whiskers is mainly based on the fulminous phase transition at the initial stage and subsequent concatenation-parallel growth in length and diameter. The growth of KTi₆O₁₃ whiskers follows the concatenation-parallel growth mechansim developed in this study, which directly results in the formation of growth steps along the axis of the whiskers.

Key words: KTi6O13 whisker, morphologic evolution, growth mechanism

中图分类号:

TB383
TQ343

徐艳姬,徐明霞,申玉田,崔春翔. 纳米 KTi₆O_13w合成中的形态演化和生长机理[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2006.01325.

XU Yan-Ji,XU Ming-Xia,SHEN Yu-Tian,CUI Chun-Xiang. Morphologic Evolution and Growth Mechanism Involved in the Synthesis of Nanometer KTi₆O_13w
[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.01325.

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纳米 KTi₆O_13w合成中的形态演化和生长机理

Morphologic Evolution and Growth Mechanism Involved in the Synthesis of Nanometer KTi₆O_13w

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