Equilibrium Phase Relations of the CaO-SiO2-Ti3O5 System at 1400 °C and a p(O2) of 10−16 atm

Junjie Shi*, Yuchao Qiu, Xingbang Wan, Bin Yu, Min Chen, Fei Zhao, Jianzhong Li, Changsheng Liu, Pekka Taskinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)


The phase relations of TiOx containing systems in reducing atmospheres are extremely important for understanding the smelting process for vanadium titano-magnetite. In the present work, the equilibrium phase relations for the core CaO-SiO2-Ti3O5 system at 1400 °C and oxygen partial pressure of 10−16 atm were determined. Ti3O5 was confirmed as the stable Ti oxide in CO(g)-C equilibrium, and the solid phases Ti3O5, 3CaO·Ti3O5, SiO2, and CaO·SiO2 were found to coexist with the liquid oxide within the composition range investigated. The 1400 °C isothermal phase diagram of the CaO-SiO2-Ti3O5 system was constructed to demonstrate the areas of single liquid, as well as the two-phase and three-phase domains. Furthermore, a comparison with results in the literature indicated that the single liquid domain at 1400 °C greatly shrinks when the oxygen partial pressure decreases from air to 10−16 atm, and the corresponding liquid coexisting phases of TiO2 and CaO·TiO2 transform to Ti3O5 and 3CaO·Ti3O5.

Original languageEnglish
Pages (from-to)668–675
Issue number2
Early online date14 Jan 2022
Publication statusPublished - Feb 2022
MoE publication typeA1 Journal article-refereed


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