The performance of magnesium potassium phosphate cement is closely related to the content of MgKPO 4 · 6H2 O (K-struvite) .In this study ,the relative content of K-struvite and MgO in magnesium phosphate cement was analyzed by the adiabatic method and Rietveld method based on X-ray diffraction ,and the formula for converting relative content into absolute content was proposed .The dehydration temperature and absolute content of K-struvite were determined by thermogravimetric method ,and the results were compared with the results obtained by adiabatic method and Rietveld method . The results obtained from the three methods were consistent .Adiabatic method and Rietveld method are simple and fast in the analysis of the relative content of K-struvite ,but the required relative information is much more than that of thermogravimetric method when converting to absolute content ,therefore the thermogravimetric method is more operational .%磷酸钾镁水泥的各项性能与其中水化产物六水磷酸钾镁(K-Struvite)的含量息息相关.使用基于X射线衍射的绝热法、Rietveld法分析了不同配比磷酸钾镁水泥中K-Struvite和MgO的相对含量,并提出了将相对含量转化为绝对含量的公式.之后使用热重分析法确定了K-Struvite的脱水温度和绝对含量,并和绝热法、Rietveld法所得结果进行了比较,发现三种方法所得结果较为一致.绝热法和Rietveld法在分析K-Struvite相对含量时简便快速,但换算为绝对含量时比热重分析法需要的相关信息要多,可操作性弱于热重分析法.
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