托贝莫来石晶体的高温相变规律研究  

Study on High-Temperature Phase Change of Tobermorite

作　　者：杨秀丽[1] 崔晓昱[1] 崔崇[1] 马海龙[2] 杨庆[1] 

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094 [2]宁夏大学民族预科教育学院,宁夏银川750021

出　　处：《光谱学与光谱分析》2013年第8期2227-2230,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金重点课题项目(11134004);科技重大专项课题项目(2012ZX04010032);宁夏自然科学基金项目(NZ12157);江苏省建设厅计划项目(201007100002);江苏省普通高校研究生科研创新计划项目(CXZZ11-0243)资助

摘　　要：通过差热分析(TGA/DSC)、X射线衍射分析(XRD)、傅里叶变换红外光谱分析(FTIR)等测试技术,对实验室制备的纯净托贝莫来石的高温相变规律进行系统的研究。DSC结果表明,托贝莫来石结构中有四个层间分子水,加热到300℃时四个层间分子水逐渐失去。当温度升高到724℃时,部分Si—O—H键断裂,失去羟基。XRD结果表明托贝莫来石晶体结构在724℃时已经破坏,衍射峰基本消失,煅烧后的样品为无定形的非晶态。当温度持续升高到861℃时,发生晶型重构,硅灰石晶体出现,结构转变为有序的、稳定的晶体结构。当温度到达1 000℃的时候,完全转变为2M型硅灰石晶体结构。托贝莫来石的高温相变经历了"托贝莫来石→脱水托贝莫来石→脱羟基托贝莫来石→硅灰石"一系列转变过程。In the present paper,the high-temperature phase change of pure tobermorite was investigated by TGA/DSC,X-ray diffraction and infrared spectroscopy （ IR ） respectively.The DSC results showed that four interlayer water molecules were lost when they were heated at 300℃.As the temperature increased to 724 ℃,Si — O — H bonds were cleaved and dehydroxylation occurred.The XRD results showed that many diffraction peaks of tobermorite disappeared and the crystal structure was broken and collapsed.Then tobermorite tends to be disordered and amorphous.When the calcination temperature increased to 861 ℃,the disordered structure recombined to wollastonite,and the crystal structure became ordered and stable.Finally,the structure completely transformed to 2M-wollastonite at 1 000℃.It should include the process of high-temperature phase change of tobermorite ： tobermorite→dehydration tobermorite→dehydroxylation tobermorite→wollastonite.

关 键 词：托贝莫来石 高温相变 差热分析 XRD分析 红外分析 

分 类 号：O792[理学—晶体学]