The structure and phase transformations in fumed transition alumina by X-ray diffraction and solid-state NMR
Jamal Nasir,
Franz Schmidt,
Frank Menzel
et al.
Abstract:Powder X-ray diffraction, 27Al solid-state NMR and TEM were used to study the structure and phase transformations in a series of transition alumina materials with BET surface areas ranging from 220 to 30 m2/g produced by gas-to-particle flame method. During the short-lived synthesis, highly disordered γ-alumina progressively transforms into a mixture of δ and θ-alumina. For the well-crystallized mixture of δ and θ-alumina, high resolution and high S/N powder XRD pattern features a large number of superstructur… Show more
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