Abstract
Multi-stepwise pulse calorimetry is proposed for accurate, efficient measurements of thermophysical properties of not only ideal but also practical samples over a wide temperature range. In a single experiment for a few seconds, the sample is rapidly heated from 298 K up to the final step-temperature of around 2850 K in a multi-stepwise fashion with numerous step-temperatures, at each of which the sample attains a steady-state condition while it is maintained for an instant. The proposed calorimetry is suitable for measuring enthalpy at numerous different temperatures, because multiple enthalpy-change values between the brief steady-state conditions can be obtained in a single experiment. As a feasibility demonstration, the specific enthalpy and its uncertainty in the temperature range 1050–2850 K have been determined for Mo and W, respectively. The measured enthalpies and emissivities are compared with the corresponding standard data.
Original language | English |
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Article number | 178763 |
Journal | Thermochimica Acta |
Volume | 693 |
DOIs | |
Publication status | Published - 2020 Nov |
Externally published | Yes |
Keywords
- Emissivity
- Enthalpy
- Heat capacity
- Molybdenum
- Tungsten
ASJC Scopus subject areas
- Instrumentation
- Condensed Matter Physics
- Physical and Theoretical Chemistry