ELECTRON-MICROSCOPY STUDY OF DELAMINATION IN DISPERSIONS OF THE PEROVSKITE-RELATED LAYERED PHASES K[CA2NAN-3NBNO3N+1] - EVIDENCE FOR SINGLE-LAYER FORMATION

Intercalation of basic surfactant molecules into the layered perovskites H[Ca2Nan−3NbnO3n+1], n = 3–5, can be used to cause spontaneous exfoliation of the structure into thin sheets that form stable dispersions in a polar solvent. The extent of exfoliation has been determined by examining Rutherford scattered intensities into a high-angle annular dark-field detector in a scanning transmission electron microscope. It is shown that for n ≤ 5, the layered perovskites can be exfoliated to form single layers. Exfoliation is easiest for the n = 3 and 4 materials. © 1990, American Chemical Society. All rights reserved.