KHF_2固-固相变贮能的研究

The Study of Potassium Hydrogen Difluoride for Solid-Solid Phase Transitions in Thermal Energy Storage

利用DTA -TG和DSC热分析技术研究了无机塑晶材料KHF2 固 -固相变的热性能 ,测得转变温度为194 80℃ ,转变焓为 113 74J/g ,KHF2 贮热的固 -固相变机理是随着温度的升高 ,晶体中氢健部分断裂 ,晶体逐渐由低对称的四方晶系向高对称立方晶系转变 ,并在这过程中 ,同时引入化学键的振动和转动无序 ,从而吸收大量的相变焓。

DTA-TG and DSC was used to stud the solid-solid transitions of inorganic plastic crystals potassium bydrogen difluoride.Experimental data showed that solid-solid phase transitions occurs at 194 80℃,the enthalpies of phase transitions is 113 74J/g.The mechanism of solid-solid phase transitions of potassium hydrogen difluoride are known to transform from a low symmetric tetragonal crystal to a highly symmetric cubic structure as the temperature is increased,and exhibit solid state transformations in which hydrogen bonds are broken and rotational and vibrational disorder with a high heat absorded.