In this paper,hydrothermal phase reaction in MgSO4NaOHH2O quarternary reciprocal system at 160℃ has been studied.There appear four solid phases,corresponding to Mg(OH)2,5Mg(OH)2·MgSO4·2H2O,3Mg(OH)2·MgSO4·H2O and 2Mg(OH)2·MgSO4 respectively.The solid phases were determined by Chemical analysis,and characterized by both XRD and microphotograph.The MgSO4 concentration affects morphology of MOS(5Mg(OH)2·MgSO4·2H2O) whisker.
Using MgSO4 and NaOH solutions as starting materials, the whisker of 5Mg(OH)2·MgSO4·2H2O has been prepared by hydrothermal method at 160℃ for different time. The whisker was separated, washed by water, ethanol and ether,and characterized by chemical analysis, XRD, IR and microphotography. The growth time of whisker would affect its morphology.
