Thermophysical Properties of Acmite.
Ko-HC; Ferrante-MJ; Stuve-JM
7th Symp on Thermophys Prop Wash DC 1977 May; :392-395
Thermal properties were determined by the federal Bureau of Mines for a synthetic sample of acmite, nafe(sio3)2, in the temperature range of 5 to 1,201 k. Low-temperature heat capacities were measured incrementally in the temperature range of 5 to 308 k using a precision adiabatic calorimeter. A relatively large thermal anomaly was observed at about 7 k. Low-temperature data are tabulated for cpo, so, ho-hoo, and -(go-hoo)/t. The derived value of so298.15 is 170.57 +/- 0.20 J/k.Mol. High-temperature enthalpy increments were determined by copper-block drop calorimetry between 298 and 1,201 k. No phase transition or other anomalous behavior was observed in this temperature range. High-temperature data are tabulated for cpo, so, ho-ho298, and -(go-ho298)/t. A standard-form equation representing the enthalpies is given.
7th Symp. on Thermophys. Prop., Wash., DC, May, 1977; Am. Soc. of Mech. Eng., New York, PP. 392-395