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| Titel: |
A SEMI-EMPIRICAL CORRLATION OF EQUILIBRIUM PROPERTIES FOR NONSTOICHIOMETRIC TRANSITION METAL + SULFUR SYSTEMS |
| Auteur: |
Zhang, Nai-Wen Li, Ping Zheng, Xi-Yin |
| Verschenen in: |
Chemical engineering communications |
| Paginering: | Jaargang 140 (1994) nr. 1 pagina's 111-130 |
| Jaar: |
1994-10-01 |
| Inhoud: |
Transition metal sulfides have received much interest in their thermodynamic properties essential for understanding the nature of phase transformation. The order-disorder transformation of the vanadium + sulfur system has been studied by several investigators. However, its experimentally observed equilibrium properties cannot be adequately correlated. In this paper, a statistical thermodynamic approach to the equilibrium properties of these nonstoichio-metric compounds was attempted by considering three kinds of interaction energies among various vacancy-vacancy and metal-vacancy pairs. Both composition- and temperature-dependences of the short-range interlayer interaction energy for metal-vacancy pairs were taken into account to fit the experimental data. By applying the proposed semi-empirical model, equilibrium sulfur vapor pressures of the vanadium-sulfur system at seven temperatures, those of the niobium-sulfur system at four temperatures and those of the tantalum-sulfur system at three temperatures were calculated for a wide range of nonstoichiometric compositions. Results were compared to corresponding experimental data with good agreements. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 13 gevonden artikelen
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