Elusive Co2O3: A Combined Experimental and Theoretical Study

Shanbhag, Pavitra N. ; Biswas, Raju K. ; Pati, Swapan K. ; Sundaresan, Athinarayanan ; Rao, Chinthamani Nagesa Ramachandra (2020) Elusive Co2O3: A Combined Experimental and Theoretical Study ACS Omega, 5 (45). pp. 29009-29016. ISSN 2470-1343

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Official URL: http://doi.org/10.1021/acsomega.0c03397

Related URL: http://dx.doi.org/10.1021/acsomega.0c03397


Despite several oxides with trivalent cobalt ions are known, the sesquioxide M2O3 with Co3+ ions remains elusive. Our attempts to prepare Co2O3 have failed. However, 50% of Co3+ ions could be substituted for Ln3+ ions in Ln2O3 (Ln = Y and Lu) with a cubic bixbyite structure where the Co3+ ions are in the intermediate-spin state. We have therefore examined the structural stability of Co2O3 and the special features of solid solutions (Ln0.5Co0.5)2O3 (Ln = Y and Lu). The experimental results are interpreted in the context of ab initio-based density functional theory, molecular dynamics (AIMD), and crystal orbital Hamiltonian population (COHP) analysis. Our AIMD study signifies that Co2O3 in a corundum structure is not stable. COHP analysis shows that there is instability in Co2O3 structures, whereas Co and O have a predominantly bonding character in the bixbyite structure of the solid solution (Y0.5Co0.5)2O3.

Item Type:Article
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ID Code:119956
Deposited On:19 Jun 2021 12:40
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