High-temperature Phase Transition and the Activity of Tobermorite  

作　　者：杨秀丽 崔崇 CUI Xiaoyu TANG Guodong MA Hailong 

机构地区：[1]School of Materials Science and Engineering, Nanjing University of Science and Technology [2]Institute of Ethnic Preparatory Education, Ningxia University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第2期298-301,共4页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.11134004);the National Science and Technology Major Project(No.2012ZX04010032);the natural science foundation of Ningxia(No.NZ12157);the Project of Jiangsu Constructive Department(No.201007100002);the Graduate Innovation and Creativity Foundation of Jiangsu Province(No.CXZZ11-0243)

摘　　要：The high-temperature phase transition of tobermofite was investigated by TGA/DSC, X-ray diffraction and Infrared spectroscopy （IR）, respectively. The experimental results showed that Si-OH bonds were cleaved at 724℃ and dehydroxylation occured at the same time, implying that the crystal structure of tobermorite was broken. As a result, the dehydroxylatiun tobermorite was metastable state, exhibiting obviously hydrolysis activity. The suspension was alkaline and Ca^2＋ ions content reached a maximum value 4.76% after heat treatment at 724℃. The dehydroxylation tobermorite had potential reactive activity due to the strong hydrolysis activity. The disordered structure recombined to wollastonite, and the crystal structure became ordering and stable at 861℃. Finally, 2M-wollastonite structure can be found in the sample as the temperature reached up to 1 000℃.The high-temperature phase transition of tobermofite was investigated by TGA/DSC, X-ray diffraction and Infrared spectroscopy （IR）, respectively. The experimental results showed that Si-OH bonds were cleaved at 724℃ and dehydroxylation occured at the same time, implying that the crystal structure of tobermorite was broken. As a result, the dehydroxylatiun tobermorite was metastable state, exhibiting obviously hydrolysis activity. The suspension was alkaline and Ca^2＋ ions content reached a maximum value 4.76% after heat treatment at 724℃. The dehydroxylation tobermorite had potential reactive activity due to the strong hydrolysis activity. The disordered structure recombined to wollastonite, and the crystal structure became ordering and stable at 861℃. Finally, 2M-wollastonite structure can be found in the sample as the temperature reached up to 1 000℃.

关 键 词：REACTION TOBERMORITE crystal structure HYDROLYSIS 

分 类 号：P579[天文地球—矿物学] P578.94[天文地球—地质学]