ChemInform Abstract: PARTIAL PRESSURES OVER MERCURY TELLURIDE‐CADMIUM TELLURIDE SOLID SOLUTIONS. II. RESULTS FOR 10, 20, AND 58 MOLE PERCENT CADMIUM TELLURIDE

Tung, Tse; Gołonka, Leszek; Brebrick, R. F.

doi:10.1002/chin.198124019

Cited by 4 publications

(18 citation statements)

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“…It should be noted that the results obtained using the PAS model were achieved by using the model of ideal solutions, where there is no need to use the component activity coefficients of components in the liquid phase. In the case of the studied oxide systems we succeeded in satisfactorily modeling the phase equilibrium state with significantly fewer parameters being adjusted in comparison to the associative solutions model with one complex in the liquid phase [10][11][12][13].…”

Section: Results and Discussion: Fe-o And Mn-o Binary Systemsmentioning

confidence: 94%

“…This data appears to be quite reliable. It was previously successfully used to analyze the gas phase in these systems [10][11][12][13][14]. The most important and fundamental problem when applying the PAS model to describe phase equilibrium is the selection of the appropriate associative composition for the solution.…”

Section: Theoretical Assumptions In the Pas Modelmentioning

confidence: 99%

“…So far, the most widely used model to characterize the p-T-x phase equilibrium of these systems has been the associative solutions model. The assumption concerning the weak dissociation of these compounds at the melting point and the existence of AB complexes in the liquid phase can only explain the basic characteristics of phase equilibrium [10][11][12][13]. In particular, it refers to such characteristics as follows: the presence of a single sharp liquidus maximum of the solution at the melting point, there is considerable liquidus asymmetry in the phase diagram with regard to the composition of the alloy enriched with metallic and metalloid components.…”

Section: Introductionmentioning

confidence: 97%

“…The basic criterion during the development of the thermodynamic model of interaction between the liquid phase components in these systems was the assumption concerning the presence of a single complex in the binary liquid phase, while the relatively weak interaction between this complex and the free atoms of the basic substance was described by a sub-regular approximation [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Model of polyassosiative solutions and its application for the analysis of p–T–x equilibrium in iron-like oxide solutions and A2B6 semiconductor systems

Moskvin

Olchowik

2012

Journal of Crystal Growth

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Section: Results and Discussion: Fe-o And Mn-o Binary Systemsmentioning

confidence: 94%

Section: Theoretical Assumptions In the Pas Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Model of polyassosiative solutions and its application for the analysis of p–T–x equilibrium in iron-like oxide solutions and A2B6 semiconductor systems

Moskvin

Olchowik

2012

Journal of Crystal Growth

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“…[16] and [17] was chosen (4) so that the Gibbs-Duhem relation is obeyed for the ternary system. The standard chemical potentials define an enthalpy and entropy of dissociation and an equilibrium constant for each molecule through the equations /~~ 2C P,~ --,/~~ c "-AHD(aC) --TASD (ac) = --RT In K1 [18] ~~ + ~~ --~~ --AHD(bC) --TASD(bC) ----RTInK2 [19] For internal equilibrium within the liquid, the chemical potential of ac must equal the sum of those for a and c and that of bc must equal the sum of those for b and c. Using Eq.…”

Section: [2]mentioning

confidence: 99%

Thermodynamic Analysis of the HgTe ‐ CdTe ‐ Te System Using the Simplified RAS Model

Tung

Gołonka

Brebrick

1981

J. Electrochem. Soc.

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A quantitatively good overall fit is obtained to the phase diagram and thermodynamic data in the HgTe-CdTe-Te system. In the binaries the partial pressures along the three-phase curves are fit in addition to the liquidus points. Moreover, the liquid phase parameters are constrained so that the enthalpy and entropy of mixing of the stoichiometric binary melts are properly related to the enthalpy and entropy of formation of the binary compounds. Also included in the fit are the HgTe-CdTe pseudobinary liquidus and solidus points, the partial pressure of Hg in the pseudobinary melt, and the partial pressures of Hg, Cd, and Te2 for the Te-saturated pseudobinary solid, Hgl-uCduTe. Finally, a choice is made for the most reliable ternary liquidus points and these are included. Portions of the phase diagram, as yet unmeasured, are then calculated and presented. The liquid phase is described by a simple extension of the regular associated solution model of Jordan and Szapiro in which the interaction coefficients and dissociation constants are allowed to depend upon temperature. The partial molar quantities for the liquid phase components are derived and used in liquidus equations that are more exact than the commonly used version of the Vieland equation. Errors in some previous studies are discussed in the appendix. It is concluded that the model cannot provide a satisfactory fit to the entire Hg-Cd-Te system. Neither can it fit analogous systems in which the liquidus lines of the binary compounds are asymmetric.In this paper we gather the expe~mental data and report quantitatively good overall fits to all the phase diagram and thermodynamic data for the HgTe-CdTeTe system. Recently derived liquidus equations (1), more generally valid than the commonly used Vieland equation (2), are used and the liquid phase is described by the simplified version of the associated solution model (3,4). In the process this model is tested more extensively than previously. The liquid phase parameters leading to an overall optimum fit are used to generate calculated curves that are hopefully useful in smoothing, interpolating, and extrapolating the experimental data and guiding further experimentation. The associated solution model offers a relatively simple way of obtaining a strong composition dependence in the properties of a liquid phase. Such a dependence has been observed in a number of cases, various properties showing an extremum at or near compositions at which solid phases appear at lower temperatures (5, 6). The model has become very popular recently, and has been applied to a number of systems including HgTe-CdTe-Te (7), Zn-Cd-Te (4), a number of III-V binaries (8,9), and to A1-Ga-Sb (10), Unfortunately, the analyses cited are flawed to an unknown extent in that they take as their starting point liquidus equations arrived at by assuming the partial molar enthalpies and excess entropies of the liquid components are independent of T, an assumption that is generally invalid for associated solution models (1). Moreover, they ignore th...

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The Heat of Formation of Mercury Vacancies in Hg0.8Cd0.2Te

Wiedemeier

Trivedi²,

Whiteside³

et al. 1986

J. Electrochem. Soc.

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A modified mass loss measurement technique has been employed, for the first time, for the direct in situ determination of vacancy concentrations in Hg0.~Cdo.2Te at elevated temperatures. This technique can also be used to establish the pressure-temperature phase diagram for this type of systems. The derived mean value for the heat of formation of mercury vacancies in the above alloy is 0.43 eV. Theoretical considerations concerning the vacancy formation in HgTe and in Hg0.sCd0.2Te are in qualitative agreement with our experimental value.

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ChemInform Abstract: PARTIAL PRESSURES OVER MERCURY TELLURIDE‐CADMIUM TELLURIDE SOLID SOLUTIONS. II. RESULTS FOR 10, 20, AND 58 MOLE PERCENT CADMIUM TELLURIDE

Cited by 4 publications

References 1 publication

Model of polyassosiative solutions and its application for the analysis of p–T–x equilibrium in iron-like oxide solutions and A2B6 semiconductor systems

Model of polyassosiative solutions and its application for the analysis of p–T–x equilibrium in iron-like oxide solutions and A2B6 semiconductor systems

Thermodynamic Analysis of the HgTe ‐ CdTe ‐ Te System Using the Simplified RAS Model

The Heat of Formation of Mercury Vacancies in Hg0.8Cd0.2Te

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