Affiliation:
1. School of Materials Science and Engineering Shanghai University Shanghai China
2. Department of Physics and Astronomy University of Missouri‐Kansas City Kansas Missouri USA
Abstract
AbstractThe research of nanocrystalline pyrochlores highlights the importance of the surface structure, composition and segregated point defect in their thermal, electrical, optical, magnetic, and catalytic performances. In order to provide a basic view on the surface‐related phenomena, thermodynamic stabilities of three low‐index (100), (110), and (111) surfaces for A2Sn2O7 (A = La, Ce, Pr, Nd, Pm, Sm, Eu, or Gd), together with their configurations, electronic structures and related oxygen vacancies are investigated using first‐principles calculations. The (111) surfaces with A3SnO8 and ASn3O6 terminations are predicted to be stable due to their low surface energies. Meanwhile, the (110) surfaces with A2Sn2O8 and A2Sn2O6 terminations are found to may also form. For these surface structures, the amount of broken bonds play the main role in their structural stability, and the local coordination environment variation also has minor contribution to it. Moreover, oxygen vacancies are observed to segregate on the surface layer, owing to lower energy of breaking bonds accompanying with oxygen vacancy formation and the larger relaxation space comparing to the counterpart in bulk. These results are expected to provide guidance on optimizing the performances of these compounds through surface engineering.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Ceramics and Composites