Formation mechanisms of Wuboraite (CaAl2Cr2O7) in air and Ar atmosphere

作者：Chatterjee, Avishak; Liao, Ning^*; Xu, Tengteng; Sang, Shaobai; Li, Yawei^*; Stoch, Pawel; Jastrzebska, Ilona; Szczerba, Jacek; Nath, Mithun^*

来源：Ceramics International, 2023, 49(5): 8373-8380.

DOI：10.1016/j.ceramint.2022.10.369

• Wuboraite
• CaCrO4
• XRD
• TG-DSC

Recently, a new high-temperature ternary Cr(III) phase (Wuboraite, CaAl2Cr2IIIO7) was synthesized in the Al2O3-CaO-Cr2O3 system. However, its formation & chemical transformation mechanism is yet to be explored in detail. And here, we investigated the system between 500 and 1600 degrees C under the air and argon (Ar) atmosphere via solid-state reaction using XRD, TG-DSC, XPS, and leaching tests. Wuboraite formation starts at different temperatures (-1500 &-1100 degrees C) under different atmospheres (air and Ar). The intermediate compounds, CaCrVIO4 and CaCr2IIIO4, formed under air and Ar atmospheres, play a crucial role in wuboraite conversion given proper temperature and stoichiometry.

• 单位
  河南工业大学