Heat capacity of the reference material synthetic sapphire (α-Al2O3) at temperatures from 298.15 K to 1000 K by adiabatic calorimetry. Increased accuracy and precision through improved instrumentation and computer control

Heat capacities and entropies of La2O2CO3fromT= (12 to 300) K and of Nd2O2CO3fromT= (12 to 930) K, and their interpretation

“…Due to the low sample masses used, the accuracy and precision of the heat capacity determinations are lower than usual with the present calorimeter, (16) and they are estimated to be approximately ±0.4 per cent.…”

“…The reproducibility of the heat capacity determinations is approximately ±5·10 −2 per cent for 100 < (T /K) < 300 and decreases with decreasing temperature to ≈ ±0.20 per cent at T = 13 K. (14) The stepwise heated, high-temperature adiabatic calorimeter and the measuring technique have been described. (15,16) The temperature is measured with an ASL F-18 resistance bridge using locally constructed 25 platinum resistance thermometers. This system allows a temperature resolution of ≈3·10 −5 K. Temperature calibration is performed according to the recommendations of ITS-90 to T = 933.473 K, and the temperature against resistance relationship is extrapolated to T = 1000 K. The accuracy in temperature determination is considered to be within ±0.02 K to T = 933 K, and within ±0.10 K at T > 933 K.…”

Anomalous Temperature Dependence of the Heat of Hydration of Natrolite

“…Because many of these materials are incompatible with the Pt-Rh crucible used in the experiments, temperature calibration was conducted in identical crucibles lined with a sub-mm thick insert of alumina. Caloric calibration was accomplished by the heat-flow rate method [18] using the DSC response of synthetic sapphire [18][19][20][21][22]. The background-corrected DSC response of a synthetic sapphire disc similar in mass to the experimental charges was measured at heating rates of 5, 10, 15 and 20 K/min over the range of temperatures encountered in this study.…”

Heat capacity and thermodynamic properties of GeSe2at temperatures fromT=( 13 to 900)K. Structural phase transition atT= 423K

“…determinations is approximately ±0.05 per cent for 100 < T /K < 300, and decreases with decreasing temperature to ≈ ±0.20 per cent at T = 13 K. (11) The stepwise heated high-temperature adiabatic calorimeter and the measuring technique have been previously described. (12,13) A sample mass of ≈51 g was used in the experiments. The temperature was measured with an ASL F-18 resistance bridge using locally constructed 25 platinum resistance thermometers.…”