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首页> 外文期刊>Physica status solidi, B. Basic research >Phase transitions of KHSO4 above room temperature
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Phase transitions of KHSO4 above room temperature

机译：高于室温的KHSO4的相变

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Modulated differential scanning calorimetry (MDSC), thermogravimetric analysis (TGA) and X-ray diffraction were used to study the phase transitions in single crystals of KHSO4 (KHS) above room temperature. Our results show three phase transitions, on heating a freshly prepared sample: the first one at approximate to 120 degrees C (exothermic and metastable) accompanied by small weight loss (less than 0.25wt%), the second one at approximate to 178 degrees C (endothermic) and the third one at approximate to 212 degrees C (endothermic, melting point). The latter two phase transitions are also accompanied by weight loss and its rate depends on the surface of the sample. We discuss the first transition in terms of absorbed water molecules weakly bound to the surface that are released at 120 degrees C on heating a fresh crystal from room temperature. The second transition at 178 degrees C is discussed in terms of a partial polymerization setting in at reaction sites distributed on the surface of the crystals followed by the final decomposition above 212 degrees C. [References: 10]
机译：调制差示扫描量热法（MDSC），热重分析（TGA）和X射线衍射用于研究室温以上KHSO4（KHS）单晶的相变。我们的结果显示，在加热新鲜制备的样品时出现三个相变：第一个在约120摄氏度（放热和亚稳）下伴随着很小的重量损失（小于0.25wt％），第二个在约178摄氏度下（吸热）和第三个温度大约在212摄氏度（吸热，熔点）。后两个相变也伴随着重量损失，其速率取决于样品的表面。我们讨论了第一个转变，即吸收的水分子与表面的结合力弱，该分子在从室温加热新鲜晶体时在120摄氏度下释放。讨论了在178摄氏度下的第二次转变，该过程是通过在分布在晶体表面的反应位点进行部分聚合设置，然后在212摄氏度以上进行最终分解来进行的。[参考文献：10]

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