Calibration of temperature, enthalpy, and thermogravimetric parameters in synchronous thermal analyzer (STA) for accurate thermal analysis

Abstract Thermal analysis is widely used to measure the relationship between the temperature and physical properties of materials. Accurate temperature, enthalpy and thermogravimetric (TG) measurements are essential for ensuring data accuracy of synchronous thermal analysis, making calibration of these parameters critical. In this study, based on the calibration principles of synchronous thermal analyzer (STA), standard samples of indium (In), tin (Sn), lead (Pb), zinc (Zn), and aluminum (Al) with known melting points and enthalpy values were used to calibrate the temperature and enthalpy. Additionally, calcium oxalate monohydrate (CaC 2 O 4 ·H 2 O) standard samples with known theoretical weight loss data were adopted to calibrate the TG analysis. The calibration process improved the accuracy of the STA analysis. The calibration results were applied to the differential thermal analysis-TG analysis of quartz samples, demonstrating the crystal transformation of quartz at 578.51 °C with an enthalpy change of 10.30 J g −1 . This finding is crucial for understanding the thermal stability and phase transitions of quartz. This study provides an important reference and basis for accurate thermal analysis of various materials.