摘要
对板钛矿纳米TiO2微晶样品(n-TiO2)进行了差热分析(DTA),发现其DTA曲线上出现了A、B两个吸热峰.通过对原始样品及其系列热处理样品进行X射线衍射(XRD)实验,证实A峰对应于物理或化学吸附的脱附过程,B峰完全对应于n-TiO2原始样品结构从板钛矿经锐钛矿向着金红石的一级相变;这一结构相变使成了纳米晶粒的生长.
Using DTA measurement on nanocrystalline brookite TiO2 sample, we found two endothermic peaks on DTA curve. From XRD analysis of the original nanocrystalline TiO2 and its heat-treating samples, we obtained the following results: the first endothermic peak (peak A) corresponds to the desorption of physical or chemical absorption; the second one (peak B) is related to the first order phase transition from brookite to anatase then to rutile, and this structural phase transition is beneficial to the growth of nanocrystallilne grains.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第4期604-608,共5页
Journal of Inorganic Materials
基金
国家自然科学基金!59472020
关键词
差热分析
纳米材料
微晶
二氧化钛
nanocrystalline TiO_2, DTA, XRD, first order phase transition