Ciccioli Andrea, Latini Alessandro, Luongo Alessio, Smirnova Natalia N, Markin Alexey V, Vecchio Ciprioti Stefano
Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, Building CU014, I-00185 Rome, Italy.
Department of Chemistry, National Research Lobachevsky State University of Nizhny Novgorod, 23/5 Gagarin Av., 603950 Nizhny Novgorod, Russia.
Entropy (Basel). 2022 Jan 18;24(2):145. doi: 10.3390/e24020145.
In the present study, the molar heat capacity of solid formamidinium lead iodide (CHNPbI) was measured over the temperature range from 5 to 357 K using a precise automated adiabatic calorimeter. In the above temperature interval, three distinct phase transitions were found in ranges from 49 to 56 K, from 110 to 178 K, and from 264 to 277 K. The standard thermodynamic functions of the studied perovskite, namely the heat capacity °(), enthalpy [() - (0)], entropy (), and [°() - °(0)]/, were calculated for the temperature range from 0 to 345 K based on the experimental data. Herein, the results are discussed and compared with those available in the literature as measured by nonclassical methods.
在本研究中，使用精密自动绝热量热计在5至357 K的温度范围内测量了固态甲脒碘化铅（CHNPbI）的摩尔热容。在上述温度区间内，发现了三个明显的相变，分别在49至56 K、110至178 K和264至277 K范围内。基于实验数据，计算了所研究钙钛矿在0至345 K温度范围内的标准热力学函数，即热容°()、焓[() - (0)]、熵()以及[°() - °(0)]/。在此，对结果进行了讨论，并与文献中通过非经典方法测量的结果进行了比较。
