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Thermodynamic Properties of Aegirine.

Authors
Bennington-KO; Brown-RR; Beyer-RP
Source
MISSING :16 pages
Link
NIOSHTIC No.
10004022
Abstract
The thermodynamic properties of aegirine, of composition [(na0.869Fe3+0.7362Fe2+0.16Mn0.03Ca0.1121) (Al0.141Si1.9738) (O6)], were experimentally determined at the Bureau of Mines as part of its efforts to advance minerals technology. The standard enthalpy of formation was determined by hydrofluoric acid solution calorimetry. Low-temperature heat capacities were determined by adiabatic calorimetry from 19.1 to 304.6 K. The derived standard entropy was determined. The heat capacity was measured over the range 348 to 1,198 k by differential scanning calorimetry. These experimentally determined data were combined with data from the literature to calculate the Gibbs energies of formation and equilibrium constants of formation over the temperature range of the measurements. Standard enthalpies of formation are given as functions of temperature.
Publication Date
19840101
Document Type
IH; Report of Investigations
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
RI 8912
NIOSH Division
DRC;
Source Name
MISSING
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