9Mg(OH)(2)·MgCl(2)·4H(2)O，氧化镁结合体系的高温相。

9Mg(OH)(2)·MgCl(2)·4H(2)O, a high temperature phase of the magnesia binder system.

机构信息

Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

出版信息

Inorg Chem. 2010 Nov 1;49(21):9770-6. doi: 10.1021/ic1004566.

PMID:20886888

Abstract

The metastable phase 9Mg(OH)(2)·MgCl(2)·4H(2)O (9-1-4 phase) was found at the extended metastable isotherm of Mg(OH)(2) in the system MgO-MgCl(2)-H(2)O at 120 °C and occurs as intermediate binder phase during setting of magnesia cement due to temperature development of the setting reaction. The crystal structure of the 9-1-4 phase was solved from high resolution laboratory X-ray powder diffraction data in space group I2/m (C2/m) (a = 22.2832(3) Å, b = 3.13501(4) Å, c = 8.1316(2) Å, β = 97.753(1)°, V = 562.86(2) Å(3), and Z = 1). Structural and characteristical relations of the phases in the system MgO-MgCl(2)-H(2)O can be derived, with which the development of the cement or concrete qualities becomes explainable.

摘要

发现了在 120°C 的 MgO-MgCl2-H2O 体系中，在 Mg(OH)2 的扩展亚稳等温线上存在的亚稳态相 9Mg(OH)(2)·MgCl(2)·4H(2)O（9-1-4 相），由于凝固反应的温度发展，它在镁质水泥的凝固过程中作为中间结合相出现。通过对高分辨率实验室 X 射线粉末衍射数据在空间群 I2/m（C2/m）（a = 22.2832(3) Å, b = 3.13501(4) Å, c = 8.1316(2) Å, β = 97.753(1)°, V = 562.86(2) Å(3), and Z = 1）中的 9-1-4 相进行求解，得到了该相的晶体结构。可以得出该体系中各种相的结构和特征关系，从而解释水泥或混凝土质量的发展。