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Thermodynamic properties of pollucite (a cesium-aluminum-silicate).

Authors
Bennington-KO; Beyer-RP; Johnson-GK
Source
MISSING; :1-18
Link
NIOSHTIC No.
10002881
Abstract
The thermodynamic properties of pollucite [(cs0.650Na0.185Rb0.028)(Alsi2)(o5.863Oh 0.137).0.19H2o] were determined by the Bureau of Mines in collaboration with the Argonne National Laboratory. The standard enthalpy of formation determined by hydrofluoric acid calorimetry is ^hf deg. 298 = -3,098.52 +/-3.63 Kj mol-1. The standard enthalpy of formation from the oxides is ^h deg. 298 (From oxides) = -209.50 +/-2.38 Kj mol-1. Low-temperature heat capacities were determined by adiabatic calorimetry from 5.0 to 306.1 K. The derived standard entropy is s deg. 298 = 207.20 +/-0.43 J mol-1 k-1. Enthalpy increments above 300 k were measured by copper-block drop calorimetry from 349 to 674 k. Various experimental data were combined with other data from the literature to calculate the Gibbs energies of formation and equilibrium constants of formation over the temperature range of measurements. Standard enthalpies of formation and Gibbs energies of formation are given as functions of temperature. The Gibbs energy of formation is ^gf deg. 298 = -2,919.9 Kj mol-1.
Keywords
Mining-industry; Thermodynamics; Aluminum-compounds; Silicates
CAS No.
7429-90-5
Publication Date
19830101
Document Type
IH; Report of Investigations
Fiscal Year
1983
NTIS Accession No.
NTIS Price
Identifying No.
RI 8779
NIOSH Division
ALRC
Source Name
MISSING
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