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- W2952059097 abstract "The vapor pressure as a function of temperature of several commercial grades of red phosphorus and a specially prepared crystalline sample has been measured. For crystalline red P we obtain a heat of sublimation, . The commercial grades yield vapor pressures, which above 450°C are described by the equation In . The sublimation equilibrium of red P can be utilized for controlling phosphorus pressures, , with a reproducibility of 10% if commercial P of at least 5N purity is used. Measurements of the pVT relation of phosphorus vapor in the regimes and reveal deviations up to 10% from ideal gas behavior. Excellent accuracy in describing the behavior of phosphorus vapor is obtained when van der Waals equation is used in conjunction with the critical data of Marckwald and Helmholz and a critical coefficient of 0.375 for calculation of both the co‐volume and the interaction parameter. Consideration of the pressure dependence of the equilibrium constant Kp for the reaction yielded approximate values for the fugacity constant at 1000° and 1100°C. The pTx relation at the liquidus in the vicinity of stoichiometric InP for indium‐rich and phosphorus‐rich compositions were established by simultaneous vapor pressure and DTA measurements. The melting point of stoichiometric InP is and the corresponding equilibrium phosphorus pressure is . T−x liquidus data calculated with the assumption of ideal behavior of the liquid are in good agreement with our experimental data. Interpretation of the liquidus pressure data yields values of the standard enthalpies and entropies at 298° K for the reaction and for the reaction These results are in excellent accord with the standard enthalpies reported by Panish and Arthur and agree within 3% with literature data on the standard entropies of the reactants. The growth of n‐ and p‐type InP crystals via the gradient freeze technique is discussed and the degree of control of the liquidus concentration is evaluated for various conditions of crystal growth." @default.
- W2952059097 created "2019-06-27" @default.
- W2952059097 creator A5039468081 @default.
- W2952059097 creator A5057889705 @default.
- W2952059097 date "1974-10-01" @default.
- W2952059097 modified "2023-09-24" @default.
- W2952059097 title "ChemInform Abstract: PHASE EQUILIBRIA AND VAPOR PRESSURES OF PURE PHOSPHORUS AND OF THE INDIUM/PHOSPHORUS SYSTEM AND THEIR IMPLICATIONS REGARDING CRYSTAL GROWTH OF INP" @default.
- W2952059097 cites W2095573079 @default.
- W2952059097 doi "https://doi.org/10.1002/chin.197439030" @default.
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