Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (03): 212-215.doi: 10.3866/PKU.WHXB20030305

• ARTICLE • Previous Articles     Next Articles

Hydrothermal Crystal Growth of Mg(OH)2•2MgSO4•2H2O

Zhu Li-Xia;Yue Tao;Gao Shi-Yang;Xia Shu-Ping   

  1. Xi’an Branch, Institute of Salt Lakes, Chinese Academy of Sciences, Xi’an 　710043; Institute of Applied Chemistry, Shaanxi Normal University, Xi’an　710062; Department of Chemistry, Lanzhou University, Lanzhou　730000
  • Received:2002-06-21 Revised:2002-08-09 Published:2003-03-15
  • Contact: Xia Shu-Ping E-mail:gsyabc@pub.xaonline.com

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Abstract: The hydrothermal reaction processes of MgSO4-NaOH-H2O system with the same raw materials concentration for different reaction time at 160 ℃ have been studied. There are two magnesium oxysulfate compounds obtained by hydrothermal reaction, namely 5Mg(OH)2•MgSO4•2H2O(MOS) whisker and Mg(OH)2•2MgSO4•2H2O crystal. The compounds were characterized by chemical analysis, XRD, FT-IR and SEM. The 5Mg(OH)2•MgSO4•2H2O whisker is a metastable phase in MgSO4-NaOH-H2O system at 160 ℃,whereas the Mg(OH)2•2MgSO4•2H2O crystal is the stable phase.

Key words: Magnesium oxysulfate, Crystal growth, Hydrothermal synthesis, 　Metastable phase, Stable phase