Type

Journal Article

Authors

Peter D Nellist
Beatriz Mendoza-Sanchez
Henrik Pettersson
João Coelho
Valeria Nicolosi
Lewys Jones
Megan Canavan
Timothy J Pennycook

Subjects

Physics

Topics
experimental individual scale chemical reaction phase energy storage materials science processes solid state chemical reaction

Atomic scale dynamics of a solid state chemical reaction directly determined by annular dark-field electron microscopy. (2014)

Abstract Dynamic processes, such as solid-state chemical reactions and phase changes, are ubiquitous in materials science, and developing a capability to observe the mechanisms of such processes on the atomic scale can offer new insights across a wide range of materials systems. Aberration correction in scanning transmission electron microscopy (STEM) has enabled atomic resolution imaging at significantly reduced beam energies and electron doses. It has also made possible the quantitative determination of the composition and occupancy of atomic columns using the atomic number (Z)-contrast annular dark-field (ADF) imaging available in STEM. Here we combine these benefits to record the motions and quantitative changes in the occupancy of individual atomic columns during a solid-state chemical reaction in manganese oxides. These oxides are of great interest for energy-storage applications such as for electrode materials in pseudocapacitors. We employ rapid scanning in STEM to both drive and directly observe the atomic scale dynamics behind the transformation of Mn 3 O 4 into MnO. The results demonstrate we now have the experimental capability to understand the complex atomic mechanisms involved in phase changes and solid state chemical reactions
Collections Ireland -> Trinity College Dublin -> Administrative Staff Authors (Scholarly Publications)
Ireland -> Trinity College Dublin -> Administrative Staff Authors

Full list of authors on original publication

Peter D Nellist, Beatriz Mendoza-Sanchez, Henrik Pettersson, João Coelho, Valeria Nicolosi, Lewys Jones, Megan Canavan, Timothy J Pennycook

Experts in our system

1
João Coelho
Trinity College Dublin
Total Publications: 10
 
2
Valeria Nicolosi
Trinity College Dublin
Total Publications: 67