Structure of boehmite-derived γ-alumina and its transformation mechanism revealed by electron crystallography

ABSTRACT: The crystal structure of γ-alumina was revealed by electron crystallography and its transformation mechanism from boehmite is proposed. γ-Alumina is a widely used material, while its precise crystal structure and transformation mechanism derived from boehmite have remained unclear in the literature for decades. In this work, quantitative electron microscopy has been applied to study the crystalline structure of γ-alumina and its transformation mechanism from boehmite. Based on Rietveld refinement of electron diffraction patterns, a new tetragonal structure model, with a space group of I41/amd (No. 141), was proposed for the γ-alumina phase, with Al cations on 4a, 8c, 8d and 16g sites and O anions on the 16h site, which could provide better fits than current models. During the boehmite to γ

SUBMITTER: Luo Z 

PROVIDER: S-EPMC8489438 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature