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Title: Centrality measures highlight proton traps and access points to proton highways in kinetic Monte Carlo trajectories

A centrality measure based on the time of first returns rather than the number of steps is developed and applied to finding proton traps and access points to proton highways in the doped perovskite oxides: AZr{sub 0.875}D{sub 0.125}O{sub 3}, where A is Ba or Sr and the dopant D is Y or Al. The high centrality region near the dopant is wider in the SrZrO{sub 3} systems than the BaZrO{sub 3} systems. In the aluminum-doped systems, a region of intermediate centrality (secondary region) is found in a plane away from the dopant. Kinetic Monte Carlo (kMC) trajectories show that this secondary region is an entry to fast conduction planes in the aluminum-doped systems in contrast to the highest centrality area near the dopant trap. The yttrium-doped systems do not show this secondary region because the fast conduction routes are in the same plane as the dopant and hence already in the high centrality trapped area. This centrality measure complements kMC by highlighting key areas in trajectories. The limiting activation barriers found via kMC are in very good agreement with experiments and related to the barriers to escape dopant traps.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Department of Chemistry, California Institute of Technology, Pasadena, California 91125 (United States)
  2. Confluent Science, Wilbraham, Massachusetts 01095 (United States)
  3. Department of Chemistry, Mount Holyoke College, South Hadley, Massachusetts 01075 (United States)
Publication Date:
OSTI Identifier:
22415661
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 15; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINATES; BARIUM COMPOUNDS; DIFFUSION BARRIERS; DOPED MATERIALS; MONTE CARLO METHOD; PEROVSKITE; PROTONS; STRONTIUM COMPOUNDS; TRAPPING; TRAPS; YTTRIUM OXIDES; ZIRCONATES