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Probing the Cation Distribution in Gamma-alumina Enabled by O-K Edge Artifact Suppression Using Cryo-EELS

Gamma-alumina (γ-Al 2 O 3 ) is one of several transitional phases of Al 2 O 3 with valuable properties that render it highly useful in a number of applications including catalysis and absorbents. Yet despite the technological importance of γ-Al 2 O 3 , its crystal structure is still not fully understood. While γ-Al 2 O 3 was originally described as having a spinel-like structure [1], many different spinel-based and nonspinel structures have since been proposed. In our previous work, we verified that the cubic spinel-based model is indeed the most accurate for γ-Al 2 O 3 [2]. However, the distribution of Al cations in the lattice remains unclear. Since cation vacancies must be added to the normal spinel structure to achieve the correct stoichiometry of Al 2 O 3 , the placement of the vacancies in either tetrahedral or octahedral sites determines the Al cation distribution. Prior studies have reached contradictory conclusions, with some claiming all vacancies are on octahedral sites [3], some suggesting all vacancies are on tetrahedral sites [4], and some claiming a mixed distribution [5]. Determining the cation distribution is key to accurately modeling γ-Al 2 O 3 for various theoretical simulations, including catalytic property simulations which are of great interest to the chemical engineering community.