Equilibrium Pressure Measurements Above ZnS from 680° to 825°C

McCabe, C. L.

doi:10.1007/bf03398330

Cited by 7 publications

(12 citation statements)

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“…[15] and the data of Schoonmaker etal. (13) for ZnsP2, reversing the method used to evaluate AH ~ and S ~ for Eq.…”

Section: Estimated Thermodynamic Properties Of Znp2mentioning

confidence: 92%

“…Carrying out the calculations, one finds AH ~ ----24.3 kcal for Eq. [15] and S ~ ----14.4 eu/ g-mole.…”

Section: Estimated Thermodynamic Properties Of Znp2mentioning

confidence: 98%

“…[1], for the correct mode of evaporation, as expressed above, is possible by the extension of a procedure established by McCabe (15) and also by Goldfinger and Jeunehomme (16) for the analysis of the Knudsen evaporation of II-VI compounds. Ac- 1 Nesmeyanov et al (10) utilized the usual Knudsen equation to calculate Pobs from their experimental data.…”

Section: The Vaporization and Some Thermodynamic Properties Of Zn3as2mentioning

confidence: 99%

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Some Thermodynamic Properties of Zn[sub 3]As[sub 2], Cd[sub 3]As[sub 2], and ZnP[sub 2]

Jordan¹

1971

J. Electrochem. Soc.

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By analogy with the known mode of vaporization of Zn.3P2, Cd3As2 and Cd3P2, the Knudsen cell pressure measurements on Zn3As2 of Nesmeyanov et aI. between 601 ~ and 751~ have been reinterpreted according to the reaction Zn~As2(s) -~ 3Zn(g) + 1/~As4(g)The derived free energy change for this reaction, given by AG ~ (kcal) ----139 --99.8 >< 10-3T is consistent with the fragmentary thermochemical data for Zn3As2. In addition, the free energy change for the dissociation reaction ZnP2(s) = 1/3 Zn3P2(s) q-1/3 P4(g) has been estimated as ~G ~ (kcal) --21.4 --18.4 X 10-3T Finally, the entropies of fusion of Zn3As2 and Cd.~As2 have been evaluated by applying the Clausius-Clapeyron equation to recent data, yielding 28.7 and 29.5 eu/g-mole, respectively.The importance of the group II-V compounds ZnAs_~, Zn3As2, ZnP2, and Zn3P2 in the interpretation of the Ga-As-Zn and Ga-P-Zn ternary phase diagrams has been emphasized by Panish (1, 2). Recently, Casey and Panish (3) lacked thermodynamic data for Zn3As2 in their analysis of Zn diffusion in GaAs from an invariant ternary source. Moreover, thermodynamic data for Zn3P~ and ZnP2, if available, are thought to be useful to design and interpret Zn diffusion experiments in GaP from a ternary source. The diffusion of Zn into GaxInl-xP from Zn~P2 has been accomplished by Hakki (4).In addition, there is also an intrinsic interest in the properties of the II-V compounds. For example, Rubenstein and Dean (5) have very recently observed the luminescence of ZnP2. Other semiconducting II-V compounds such as ZnAs2, CdAs2, Zn3As2, and Cd3As2 have also been investigated (6-8).The volatilities of ZnAse, CdAs2, Cd3As2, and Zn:~P2 have been the subjects of several thermochemical studies. However, there are no thermodynamic data for ZnP2 and the information on Zn3Ase is fragmentary and incorrectly interpreted. The primary objective of this paper is the derivation of consistent thermodynamic data for Zn3As2 by the reinterpretation of available measurements. Then, the standard heat of formation and entropy of ZnP2 are estimated by comparison with the properties of other arsenides and phosphides. These thermodynamic data for Zn~Ase and ZnP2 were found to be useful in recent work (9) concerned with the solid solubility of Zn in GaP and GaAs. In addition, the entropies of fusion of Zn3As2 and Cd3As2 are evaluated by the Clausius-Ciapeyron equation from existing pressure-temperature and density data. Finally, the entropies of fusion of ZnAs2, ZnP2, and Zn3P2 are estimated.

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“…[15] and the data of Schoonmaker etal. (13) for ZnsP2, reversing the method used to evaluate AH ~ and S ~ for Eq.…”

Section: Estimated Thermodynamic Properties Of Znp2mentioning

confidence: 92%

“…Carrying out the calculations, one finds AH ~ ----24.3 kcal for Eq. [15] and S ~ ----14.4 eu/ g-mole.…”

Section: Estimated Thermodynamic Properties Of Znp2mentioning

confidence: 98%

Section: The Vaporization and Some Thermodynamic Properties Of Zn3as2mentioning

confidence: 99%

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Some Thermodynamic Properties of Zn[sub 3]As[sub 2], Cd[sub 3]As[sub 2], and ZnP[sub 2]

Jordan¹

1971

J. Electrochem. Soc.

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“…An equation for temperature dependence of the total pressure is also given. Their equation for the total pressure as a function of the rate of weight loss is taken from one given by McCabe [27] and in our opinion is in error. It appears the total pressure calculated is that which holds when P Zn = 2P 2 , a condition that does not hold during steady state effusion.…”

Section: Knudsen Cell Measurementsmentioning

confidence: 99%

High Temperature Thermodynamic Properties of ZnTe(s)

Brebrick

2011

J. Phase Equilib. Diffus.

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We have gathered the partial pressure, Knudsen cell, and emf measurements on ZnTe(s) from which the Gibbs energy of formation can be calculated. Published partial pressures of diatomic tellurium have been adjusted to take account of a subsequently published third law analysis of tellurium. The equation used to calculate the total pressure from the rate of mass loss from an extensive set of Knudsen cell measurements has been corrected to give a 5% increase in total pressure and the Gibbs energy of formation has been recalculated. A high temperature heat capacity for ZnTe(s) has been selected from the published data. The Gibbs energies of formation as a function of temperature have then been fit using a third law analysis to give two essentially equally good but extreme fits. In the first, the standard enthalpy of formation agrees with the calorimetric value of 2119 kJ/mol but the standard entropy of ZnTe(s) is low by 2-3 J/mol K. In the second, the standard enthalpy of formation is more positive than the calorimetric values by about 3 kJ/mol but the standard entropy of ZnTe(s) is 82 J/mol K and close to the value from low temperature heat capacity measurements. We select values of 2119.49 kJ/mol for the standard enthalpy of formation and 78.23 J/mol K for the standard entropy.Keywords partial pressures over ZnTe(s), standard enthalpy of formation of ZnTe(s), standard entropy of ZnTe(s), thermodynamic properties of ZnTe(s), third law analysis for ZnTe(s)

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“…ZnSe(s) =Zn(g) +Se2(g)/2, was investigated by determining the effective molar weight Meff of the equilibrium vapor phase. The experimentally obtained effective molar weight was compared with that given by McCabe [2], i.e.…”

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confidence: 99%