An assessment of the Ca-V-O system. (March 2017)

• Record Type: Journal Article
• Authors: Yang, Yang; Mao, Huahai; Selleby, Malin
• Is Part Of: Calphad. Volume 56(2017)
• Page Start: 29
• Page End: 40
• Publication Date: 2017-03
• Subjects: Bronze -- Thermodynamic modeling -- CALPHAD -- V2O5-CaV2O5, CaO-V2O5-VO2; Phase diagrams -- Data processing -- Periodicals; Thermochemistry -- Data processing -- Periodicals; Diagrammes de phases -- Informatique -- Périodiques; Thermochimie -- Informatique -- Périodiques; Thermodynamica; Electronic journals; 541.363
• DOI: 10.1016/j.calphad.2016.11.005
• Languages: English
• ISSNs: 0364-5916

Abstract

Abstract: The Ca-V-O system is studied with an emphasis on the following oxide sub-systems: CaO-V2 O5, CaO-V2 O3, V2 O5 -CaV2 O5 and CaO-V2 O5 -VO2 . The aim of the present assessment is to obtain a thermodynamic description of the Ca-V-O system. The compound energy formalism was used to describe the liquid by applying the ionic two-sublattice model and the β-bronze phase Cax V2 O5 (0.17≤x≤0.33) using a three-sublattice model. Phase equilibria and thermodynamic properties were critically evaluated using the CALPHAD approach and a consistent set of thermodynamic model parameters was obtained. Satisfactory agreement between calculated and experimental values is achieved. Highlights: Emphasis on the sub-systems: CaO-V2 O5, CaO-V2 O3, V2 O5 -CaV2 O5 and CaO-V2 O5 -VO2 . A self-consistent thermodynamic dataset of the Ca-V-O system is obtained. The liquid phase is described using the ionic two-sublattice model. The β-bronze phase Cax V2 O5 (0.17≤x≤0.33) is modeled using a three-sublattice model. The isothermal sections of CaO-V2 O5 -V2 O4 at 873 and 923 K have been reproduced.