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用连续加热原位红外光谱法研究了水氯镁石(MgCl_2·6H_2O)、光卤石(KMgCl_3·6H_2O)和铵光卤石(NH_4MgCl_3·6H_2O)脱水过程的光谱变化和结构特征。依据谱图数据估算了各脱水阶段所形成的不同水合物的氢键能和镁氧键能。由算得的结果和最后产物MgOHCl的吸收情况,证实了光卤石比水氯镁石更难水解,而铵光卤石居中。提供了一种新的制样方法。
In situ FTIR spectroscopy was used to study the spectral changes and structural features of the dehydration process of MgCl_2 · 6H_2O, KMnCl_3 · 6H_2O and NH_4MgCl_3 · 6H_2O. The hydrogen bond energy and magnesium oxygen bond energy of different hydrates formed in each dehydration stage were estimated based on the spectral data. From the calculated results and the absorption of the final product MgOHCl, it was confirmed that carnallite is more difficult to hydrolyze than bischofite while ammonium carnallite is centered. A new sample preparation method is provided.