硝酸肼的量热研究

用精密自动绝热量热计测定了在220 K—370 K温度范围内硝酸肼的热容、熔化热、熔化温度和熔化熵。所得热容数据的精密度以百分偏差的均方根值表示为±0.2％。三次熔化热测定的相对偏差为±0.1％。为验证结果的可靠性, 用该装置测定了冰的熔化热和熔化温度, 其结果与文献值一致; 又用法国SETARAM公司的高温量热计测定了硝酸肼的熔化热和熔化温度, 其结果与我们用量热法测定的结果一致; 从量热结果计算出了该试样的纯度, 该结果亦与化学分析的结果一致。这些均可说明我们所测得的数据是可靠的。

CALORIMETRIC STUDY FOR HYDRAZINE NITRATE

By using a precision automatic adiabatic calorimeter the heat capacity of hydrazine nitrate in the temperature range of 220-370 K have been measured. The heat of fusion, melting point and entropy of fusion for the sample have been obtained from the results of heat capcity measurements. The precision of heat capacity measurements for hydrazine nitrate is ±0.2％, as shown by the root-mean-square (r. m. s.) of the percentage deviation, and the relative error for heat of fusion measurement is 0.1％. In order to varify the reliability for all of these measurements we have determined the heat capacity, heat of fusion as well as the melting point of pure ice with the same apparatu and the results were found to be in agreement with the data in literature. Then, the heat of fusion and melting point of hydrazine nitrate have been measured with the SETARAM high temperature calorimeter. The results obtained by the two apparatuses coincided with each other. Besides, the purity derived from the heat capacity measurements of the sample is in agreement with the results from chemical analysis. The facts show that the data from calorimetric measurements for hydrazine nitrate are reliable.