地质学报（英文版）2021，Vol.95Issue(3)：810-829,20.
Thermal Behavior and Determination of the Heated Structure of 11- Anomalous Tobermorite by in situ X-ray Diffraction
Thermal Behavior and Determination of the Heated Structure of 11? Anomalous Tobermorite by in situ X-ray Diffraction
摘要
Abstract
This article presents the thermal transitions of a tobermorite-bearing sample when heated from 30℃ up to 1200℃, both in vacuum and in static air, including tobermorite transforming to wollastonite, aragonite to calcite and calcite to lime. Characteristics obtained by in situ high temperature X-ray diffraction, field emission scanning electron microscopy and scanning transmission electron microscopy analyses jointly indicate that the investigated tobermorite is anomalous. The variations along the a, b, c axes and the volume changes of tobermorite with increasing temperature are described, and its thermal shrinkage coefficients therefore determined. The comparison between the refined structures at 30℃ and 800℃ demonstrates that the shrinkage degree (Δa/a0) along the a axis is higher than those (Δb/b0, Δc/c0) along the b and c axes. The wollastonite is formed in two ways: Tobermorite converting to wollastonite and lime reacting with quartz to form wollastonite.关键词
tobermorite/in situ X-ray diffraction/phase transition/thermal shrinkage/wollastoniteKey words
tobermorite/in situ X-ray diffraction/phase transition/thermal shrinkage/wollastonite引用本文复制引用
YAN Yu,WANG Hejing..Thermal Behavior and Determination of the Heated Structure of 11- Anomalous Tobermorite by in situ X-ray Diffraction[J].地质学报（英文版）,2021,95(3):810-829,20.基金项目
This work was supported by the National Natural Science Foundation of China(Grant No.41872048,41372061,40972038).The authors are grateful to Eng.W.Pan for helping in the IR experiment,to Mr.King X.for FESEM operation and to B.S.Li Y.for obtaining the STEM data. （Grant No.41872048,41372061,40972038）
