【作者】 武克忠； 王新东； 刘晓地； 张超星； 赵睿新； 李建玲；

【Author】 Wu Kezhong~(1,2*), Wang Xindong~1, Liu Xiaodi~1, Zhang Chaoxing~2, Zhao Ruixin~3, Li Jianling~1 (1. Department of physical Chemistry, University of Science and technology, Beijing 100083, China: 2. Department of Chemistry, Hebei Normal University, Shijiazhuang 050016, China: 3.Department of Environmental Economics, Shanxi University of Finance & Economics, Taiyuan 030006, China)

【机构】 北京科技大学理化系； 河北师范大学化学学院； 山西财经大学环境经济系；

【摘要】 利用DTA-TG和DSC热分析技术研究了无机塑晶材料KBF₄固-固相变的热性能,测得转变温度为284.13℃,转变焓为105.73 J/g。KBF₄固-固相变的机理是随着温度的升高,晶体中离子键部分断裂,晶体逐渐由低对称的正交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。更多还原

【Abstract】 DTA-TG and DSC was used to study the solid-solid transitions of inorganic plasticcrystals potassium tetrafluoroborate. Experimental data showed that solid-solid phase transitions occurs at 284.13℃, the enthalpies of phase transitions is 105.73J/g. The mechanism of solid-solid phase transitions of potassium tetrafluoroborate are known to transform from a low symmetric orthorhombic crystal to a highly symmetric cubic structure as the temperature is increased, and exhibit solid state transformations in which ion bonds are broken and rotational and vibrational disorder with a high heat absorded.更多还原