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Title: Effect of cation ordering on oxygen vacancy diffusion pathways in double perovskites

Journal Article · · Chemistry of Materials
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Perovskite structured oxides (ABO3) are attractive for a number of technological applications, including as superionics because of the high oxygen conductivities they exhibit. Double perovskites (AA’BB’O6) provide even more flexibility for tailoring properties. Using accelerated molecular dynamics, we examine the role of cation ordering on oxygen vacancy mobility in one model double perovskite SrLaTiAlO6. We find that the mobility of the vacancy is very sensitive to the cation ordering, with a migration energy that varies from 0.6 to 2.7 eV. In the extreme cases, the mobility is both higher and lower than either of the two end member single perovskites. Further, the nature of oxygen vacancy diffusion, whether one-dimensional, two-dimensional, or three-dimensional, also varies with cation ordering. We correlate the dependence of oxygen mobility on cation structure to the distribution of Ti4+ cations, which provide unfavorable environments for the positively charged oxygen vacancy. The results demonstrate the potential of using tailored double perovskite structures to precisely control the behavior of oxygen vacancies in these materials.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1221605
Report Number(s):
LA-UR-15-22899
Journal Information:
Chemistry of Materials, Vol. 27, Issue 14; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (5)

Highly Defective Layered Double Perovskite Oxide for Efficient Energy Storage via Reversible Pseudocapacitive Oxygen-Anion Intercalation journal January 2018
Novel ReBaCo 1.5 Mn 0.5 O 5+δ (Re: La, Pr, Nd, Sm, Gd and Y) perovskite oxide: influence of manganese doping on the crystal structure, oxygen nonstoichiometry, thermal expansion, transport properties, and application as a cathode material in solid oxide fuel cells journal January 2018
Distortion-stabilized ordered structures in A2BB’O7 mixed pyrochlores journal January 2019
Photocatalysis with Reduced TiO 2 : From Black TiO 2 to Cocatalyst-Free Hydrogen Production journal November 2018
Evidence for percolation diffusion of cations and reordering in disordered pyrochlore from accelerated molecular dynamics journal September 2017

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