Measurement of the Relative Enthalpy of Pure α-AIO (NBS Heat Capacity and Enthalpy Standard Reference Material No. 720) from 273 to 1173 K.

The relative enthalpy of NBS Standard Reference Material No. 720 (99.98 percent pure, single-crystal α-AlO, a calorimetrie heat-capacity standard) was measured over the range 273 to 1173 K by the drop method using a highly precise Bunsen ice calorimeter.

Measured Relative Enthalpy of Anhydrous Crystalline Aluminum Trifluoride, AlF, from 273 to 1173 °K and Derived Thermodynamic Properties from 273 to 1600 K.

The enthalpy of a high-purity sample of anhydrous crystalline aluminum trifluoride, AlF, relative to that at 0 °C (273.15 °K), was precisely measured with an ice calorimeter and a "drop" method at 18 temperatures starting at 50 °C and proceeding in 50-deg steps to 900 °C (1173.15 °K).

Relative Enthalpy of Beryllium 1:3-Aluminate, BeO · 3AIO, from 273 to 1173 °K. Thermodynamic Properties from 273 to 2150 °K.

The relative enthalpy of beryllium 1:3-aluminate, BeO · 3AlO, was measured from 273 to 1173 °K. Thermodynamic properties were calculated up to 2150 °K (near the melting point) by extrapolating the present measurements and making them consistent with existing low-temperature data.

Relative Enthalpy of Beryllium 1:1-Aluminate, BeO · AlO, from 273 to 1173 °K. Thermodynamic Properties from 273 to 2150 °K.

The relative enthalpy of the beryllium aluminate BeO · AlO was measured by "drop" calorimetry from 273 to 1173 °K. The thermodynamic properties were calculated up to 2150 °K (approximately the melting point). For this calculation, the data were extrapolated above 1173 °K and the entropy at 273 °K, previously determined at the NBS, was used.