The cp investigations in the region of phase changes can be roughly divided into two classes: costly and time-consuming precision measurements using adiabatic or 'alternating current' (AC) calorimetry, and survey measurements using conventional DSC. The purpose of this work is to show that 'temperature modulated ' DSC (TMDSC) provides an excellent alternative to the precision methods. Two substances, potassium dihydrogen phosphate (PDP) and strontium titanate (SrTiO3), were chosen as models to test the quality of a modified METTLER TOLEDO DSC821e calorimeter with ADSC option. The results show that the TMDSC technique is very reliable, even at medium-low temperatures, for the investigation of phase transitions in the condensed phase, as long as the cooling of the measurement system is sufficiently stable.
Precision measurements of the specific heat capacity with the temperature modulated DSC (TMDSC) at lower temperatures | Thermal Analysis Application No. UC 74 | Application published in METTLER TOLEDO Thermal Analysis UserCom 7