Water channel structure of bassanite at high air humidity: crystal structure of CaSO4·0.625H2O.
Water channel structure of bassanite at high air humidity: crystal structure of CaSO4·0.625H2O.
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高空气湿度下烧石膏的水通道结构：CaSO4·0.625H2O的晶体结构。
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
W. Voigt
中科院分区：
文献类型：
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作者：
H. Schmidt;Iris Paschke;D. Freyer;W. Voigt
利用单晶衍射技术对钙钛矿（CaSO（4）·0.5H（2）O）水道结构的性质进行了分析，并对该结构的性质进行了讨论。韦斯和Bräu（2009年）最近在空气湿度环境条件下对蓝闪石（单斜晶系，空间群C2）晶体结构的研究结果得到了证实。在高相对空气湿度的存在下，由于掺入额外的水化水，钙钛矿的晶体结构发生了转变。在298 K和75%相对湿度下，用单晶衍射法测定了CaSO（4）·0.625H（2）O的晶体结构。实验结果提供了对两种晶体结构的深入了解。提出了CaSO（4）·0.625H（2）O到CaSO（4）·0.5H（2）O的相变模型。粉末衍射证实了CaSO（4）·0.5H（2）O的单斜晶系和三方晶系。
Structure analysis using single-crystal diffraction was carried out as a contribution to the dispute about the nature of the water channel structure of bassanite (CaSO(4)·0.5H(2)O). A recent result of Weiss & Bräu (2009) for the crystal structure of bassanite (monoclinic, space group C2) at ambient conditions of air humidity was confirmed. In the presence of high relative air humidity the crystal structure of bassanite transformed due to the incorporation of additional water of hydration. The crystal structure of CaSO(4)·0.625H(2)O was solved by single-crystal diffraction at 298 K and 75% relative air humidity. The experimental results provided an insight into both crystal structures. A model explaining the phase transition from CaSO(4)·0.625H(2)O to CaSO(4)·0.5H(2)O was derived. The monoclinic cell setting of CaSO(4)·0.5H(2)O and the trigonal cell setting of CaSO(4)·0.625H(2)O were confirmed by powder diffraction.