Fig. 5: Proposed local structure models of oxygen species in γ-Al2O3.
From: Mapping the oxygen structure of γ-Al2O3 by high-field solid-state NMR spectroscopy
a–e Letters A-E represent five distinct bare oxygen sites. The purple dotted arrows indicate the spatial proximities between two specific bare oxygen sites. Surface terminal (μ1), doubly (μ2) and triply (μ3) bridging hydroxyl groups are indicated.
