Solid- phase equilibria on Pluto's surface Materials covered include oxides as well as non-oxide systems such as chalcogenides and pnictides, phosphates, salt systems, and mixed systems of these classes. SRD 31 NIST/ACerS Phase Equilibria Diagrams Database (PC database for purchase)Â Â The Phase Equilibria Diagrams Database contains commentaries and more than 21,000 diagrams for non-organic systems, including those published in all 21 hard-copy volumes produced as part of the ACerS-NIST Phase Equilibria Diagrams Program (formerly titled Phase Diagrams for Ceramists): Volumes I through XIV (blue books) Annuals 91, 92, 93 High Tc Superconductors I & II Zirconium & Zirconia Systems and Electronic Ceramics I. National Institute of Standards and Technology Data Gateway Agreement between the calculated and published phase-equilibria data is optimized when the hydrate composition is fixed and independent of the pressure and temperature for the conditions modeled. The model also provides an estimate of the third-law entropy of methane hydrate at 273.15 K, 0.1 MPa of 56.2 J mol-1 K-1 for 1/n CH4?H 2O, where n is the hydrate number. The thermodynamic model accurately reproduces the published phase-equilibria data to within ?2 K of the observed equilibrium boundaries in the range 0.08-117 MPa and 190-307 K. Using the Gibbs function of reaction, equilibrium pressure, temperature conditions for the formation of methane clathrate hydrate have been calculated from the thermodynamic properties of phases in the system CH4-H 2O. Thermodynamic calculations in the system CH4-H2O and methane hydrate phase equilibria
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