A Combined Neutron and Synchrotron X‑ray Scattering Study of a MgAl-Layered Double Oxide
Frederick Z.T. Yang, Theodosios Famprikis, Joerg Neuefeind, Mohsen Danaie, Claire T. Coulthard, Chunping Chen, Dermot O’Hare
TL;DR
This study uses advanced scattering techniques to investigate the structure of a magnesium-aluminum oxide material after thermal treatment.
Contribution
The paper presents a novel structural model of a MgAl-layered double oxide using combined neutron and X-ray scattering.
Findings
The structure of AMO-Mg2.33Al LDO is consistent with a modified rock salt structure.
The material contains octahedrally coordinated layers with vacancies and tetrahedrally coordinated Al3+ sites.
Abstract
Owing to their vast chemical and structural flexibility, layered double hydroxides (LDHs) are among some of the most promising materials for many catalytic applications. Thermal decomposition below 700 °C leads to the formation of a complex semiamorphous mixed metal oxide (LDO). In this study, the product of calcination of aqueous miscible organic solvent-treated AMO-[Mg0.70Al0.30(OH)2](CO3)0.15·yH2O·zEtOH at 600 °C (AMO-Mg2.33Al LDO) has been investigated using a synergistic combination of high-resolution synchrotron X-ray and neutron scattering techniques, as well as high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), solid-state NMR (ssNMR), and thermogravimetric analysis coupled with mass spectrometry (TGA-MS). The local and extended structure of AMO-Mg2.33Al LDO has been modeled by reciprocal and real space X-ray and neutron scattering analyses…
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Taxonomy
TopicsLayered Double Hydroxides Synthesis and Applications · Magnesium Oxide Properties and Applications · Supercapacitor Materials and Fabrication