The measurement of accurate heat capacities by differential scanning calorimetry Comparison of d.s.c. results on pyrite (100 to 800 K) with literature values from precision adiabatic calorimetry

摘要: Abstract The heat capacity of a sample FeS2, pyrite, has been measured from 100 to 800 K by differential scanning calorimetry (d.s.c.) as test the accuracy apparatus and methods employed. pyrite had previously determined in another laboratory precision adiabatic calorimetry; therefore, excellent literature values were available for comparison with present results. used was Perkin-Elmer DSC-2, augmented Tektronix calculator digital interface Perkin-Elmer. Two runs on performed, using different measuring techniques. Calculator programs these techniques are described. By either method heat-capacity measurements approximately 1 per cent over most temperature range, generally within 2 at very lowest highest temperatures. Results presented which show that use liquid-nitrogen coolant helium exchange gas DSC-2 is an unfavorable combination, producing distorted peak shapes transitions. Neon recommended when temperatures necessary. Significant improvements then observed.