Thermal Behavior and Determination of the Heated Structure of 11 angstrom Anomalous Tobermorite by in situ X-ray Diffraction
Thermal Behavior and Determination of the Heated Structure of 11 angstrom Anomalous Tobermorite by in situ X-ray Diffraction
复制标题
原位 X 射线衍射测定 11 埃异常托贝莫来石的热行为和受热结构
DOI：
10.1111/1755-6724.14678
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Wang Hejing
中科院分区：
文献类型：
--
作者：
Yan Yu;Wang Hejing
本文介绍了含有雪硅石的样品在真空和静态空气中从 30°C 加热至 1200°C 时的热转变，包括雪硅石转变为硅灰石、霰石转变为方解石以及方解石转变为石灰。原位高温X射线衍射、场发射扫描电子显微镜和扫描透射电子显微镜分析获得的特征共同表明所研究的雪硅钙石是异常的。描述了雪硅钙石沿 thea、b、c 轴的变化以及随温度升高的体积变化，并由此确定了其热收缩系数。 30℃和800℃细化结构的比较表明，沿a轴的收缩程度（Δa/a0）高于沿带c轴的收缩程度（Δb/b0，Δc/c0）。硅灰石以两种方式形成：雪硅石转化为硅灰石，以及石灰与石英反应形成硅灰石。
This article presents the thermal transitions of a tobermorite‐bearing sample when heated from 30°C up to 1200° C, 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 thea,b,caxes 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°C and 800°C demonstrates that the shrinkage degree (Δa/a0) along theaaxis is higher than those (Δb/b0, Δc/c0) along thebandcaxes. The wollastonite is formed in two ways: Tobermorite converting to wollastonite and lime reacting with quartz to form wollastonite.