Abstract
La 2CoO 4+ δ single crystals with δ=0.09 and 0.20 have been studied by neutron diffraction at room temperature. The nuclear density distribution has been reconstructed using the maximum entropy method. For δ=0.09, the tilt direction is found to be along the [0 1 0] direction with respect to the F centred unit cell, whereas the CoO 6 octahedra are distorted along [1 1 0] for δ=0.20. The related distances between the interstitial oxygen atoms and the apical oxygen atoms are about 2.75 and 2.6 Å, respectively, which exclude any peroxide character, even for higher oxygen doping. For La 2CoO 4.20, weak incommensurate satellite reflections, with a 2D incommensurate vector, have been found for the first time by X-ray diffraction indicating a more complex 3D ordering of the interstitial oxygen atoms.
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