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Figure 16
Energy diagrams illustrating the splitting of the ground state of a d5 Fe3+ ion. (a) As a function of the tetrahedral crystal field 10Dq parameter (note that 10DqTd = −10DqOh) with the spin–orbit coupling (ξ) and exchange interaction (Jexch) set to zero. (b) As a function of Jexch with 10Dq = 0.5 eV and ξ = 0. We note that the definition of JexchTd = −JexchOh because the sites are antiferromagnetically coupled. (c) As a function of ξ with Jexch = 90 meV and 10Dq = 0.5 eV.

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