Phase transitions of sodium peroxide investigated by DSC

DSCにより検討した過酸化ナトリウムの相変化

菊地 晋  ; 古賀 信吉*

Kikuchi, Shin; Koga, Nobuyoshi*

The objective of this study was to ascertain the thermodynamic parameters associated with the phase transitions of NaO through the use of differential scanning calorimetry (DSC). Due to the high chemical reactivity of NaO at elevated temperatures, particular precautions were necessary for the DSC measurement, including the selection of an appropriate crucible material, the preparation of a custom-made crucible with a specialized geometrical configuration, and the meticulous calibration of the recorded temperature and enthalpy change. Furthermore, all experimental procedures for the DSC measurement were required to be conducted under controlled atmospheric conditions of inert gas. Despite the aforementioned difficulties, we were able to successfully determine the transition temperatures and enthalpy changes associated with the structural phase transition and melting of NaO using DSC. The reliability of these thermodynamic parameters was validated by comparing them with previously reported values.