Fig. 8: STEM images showing the structure of (A′A″)2BO4-type RP oxides. | Nature Communications

Fig. 8: STEM images showing the structure of (A′A″)2BO4-type RP oxides.

From: Local-electrostatics-induced oxygen octahedral distortion in perovskite oxides and insight into the structure of Ruddlesden–Popper phases

Fig. 8

Atomic-column-resolved images were acquired in a (La,Sr)2AlO4, b (La,Sr)2GaO4, and c (Nd,Ca)2AlO4. Note that the A-site sublayers include [SrO]0 (or [CaO]0) with no effective charge and subsequently the electrostatic repulsion between the layers diminishes. Therefore, the elongation of the Al–O and Ga–O bonds toward the shear planes is not remarkable, showing a bond length of ≤ 2.2 Å. Magnified ABF images directly provide quantitative information on the bond lengths. Red arrows in each image indicate a slight displacement of oxygen anions.

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