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Title: A computational study of yttria-stabilized zirconia: I. Using crystal chemistry to search for the ground state on a glassy energy landscape

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [1]
  1. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Nuclear Science and Engineering. Dept. of Materials Science and Engineering

Yttria-stabilized zirconia (YSZ), a ZrO2-Y2O3 solid solution that contains a large population of oxygen vacancies, is widely used in energy and industrial applications. Past computational studies correctly predicted the anion diffusivity but not the cation diffusivity, which is important for material processing and stability. One of the challenges lies in identifying a plausible configuration akin to the ground state in a glassy landscape. This is unlikely to come from random sampling of even a very large sample space, but the odds are much improved by incorporating packing preferences revealed by a modest sized configurational library established from empirical potential calculations. Ab initio calculations corroborated these preferences, which prove remarkably robust extending to the fifth cation-oxygen shell about 8 Å away. Yet because of frustration there are still rampant violations of packing preferences and charge neutrality in the ground state, and the approach toward it bears a close analogy to glass relaxations. Fast relaxations proceed by fast oxygen movement around cations, while slow relaxations require slow cation diffusion. The latter is necessarily cooperative because of strong coupling imposed by the long-range packing preferences.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0007064
OSTI ID:
1533465
Alternate ID(s):
OSTI ID: 1418377
Journal Information:
Acta Materialia, Vol. 127; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (2)

DC electrical degradation of YSZ: Voltage‐controlled electrical metallization of a fast ion conducting insulator journal January 2020
Interdiffusion across Electrode-Electrolyte Interface in Solid Oxide Fuel Cell Incorporating the Finite Size Effect of the Ions journal January 2018