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[en] The complex Moessbauer spectra exhibited by FexO (x ∼ 0.91) and (Fe1-yMgy)xO (y = 0.15-0.85) powder samples at liquid helium temperature have been analysed by a Hamiltonian treatment to allow for the significant electric field gradients present at the Fe2+ defect sites. The magnetic behaviour of the defect clusters are considered in terms of antiferromagnetic couplings, consistent with the spin glass-like behaviour reported recently for magnesiowuestite. (orig.)
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