Structure of Delta-Al2O3: Toward the Atomic Level Understanding of Transition Alumina Phases

Kovarik, Libor

Monday, June 15, 2015: 9:40 AM

408-410 (Lawrence Convention Center)

Libor Kovarik¹, Mark Bowden¹, Amity Andersen¹, Jian Zhi Hu¹, Janos Szanyi¹, Ja Hun Kwak^1,2 and Charles H.F. Peden¹, (1)Pacific Northwest National Laboratory, USA, (2)UNIST, South Korea.

Crystallographic nature of delta-Al₂O₃ is resolved based on HAADF STEM, XRD, NMR techniques. The structure is found to be highly complex; representing atomic level intergrowth from several closely related crystallographic variants. Thermodynamic information obtained from DFT calculations enabled to rationalize structural complexity of transition Al₂O₃ from high temperature heat treatments.

Extended Abstracts:

Kovarik_NAM24.pdf (1404.9KB) - Extended Abstract

O-M-408-1 Structure of Delta-Al2O3: Toward the Atomic Level Understanding of Transition Alumina Phases