摘要
运用X射线衍射、红外光谱及固体高分辨核磁共振等手段,研究了苏州高岭石560~1600℃热变产物,结果显示:①高岭石.偏高岭石.莫来石的转变系列存在结构上的连续性,其转变经历了脱羟阶段(约400~600℃),偏高岭石阶段(600~800℃),相分离阶段(800~1100℃),莫来石阶段(1100~1600℃);②莫来石形成过程没有出现AlO3的大量分凝,但存在SiO2分凝;③偏高岭石.莫来石转变过程的中间相为Al-Si尖晶石和准莫来石;④引起1000℃放热反应的主要因素是SiO2的大量分凝,其次是准莫来石等过渡相的形成。
A combined approach of XRD, IR, DTA and ^29Si and ^27Al magic angle spin nuclear magnetic resonance (M.AS NMR) was used to analyze the thermal transformation products of the Suzhou kaolinite at the temperatures from 560- 1600℃. From the study we can draw the following conclusions: (1) the co-existence of three Al coordinations ( Ⅳ, Ⅴ, Ⅵ coordinated Al ) were detected in metakaolinite after kaolinite dehyclroxylation and Al^v became the major coordinated form; (2) the exothermie reaction near 1000 ℃ led to the formation of quasi-mullite; and (3) the mullite occurred at about 1100℃.
出处
《矿物学报》
CAS
CSCD
北大核心
2007年第3期255-261,共7页
Acta Mineralogica Sinica