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Title: Asymmetric Lattice Disorder Induced at Oxide Interfaces

Journal Article · · Advanced Materials Interfaces
ORCiD logo [1];  [2];  [3];  [4];  [4];  [2]
  1. Energy and Environment DirectoratePacific Northwest National Laboratory Richland WA 99352 USA
  2. Physical and Computational Sciences DirectoratePacific Northwest National Laboratory Richland WA 99352 USA
  3. Environmental Molecular Sciences LaboratoryPacific Northwest National Laboratory Richland WA 99352 USA
  4. Department of Nuclear EngineeringTexas A&,M University College Station TX 77843 USA

Control of order-disorder phase transitions is a fundamental materials science challenge, underpinning the development of energy storage technologies such as solid oxide fuel cells and batteries, ultra-high temperature ceramics, and durable nuclear waste forms. At present, the development of promising complex oxides for these applications is hindered by a poor understanding of how interfaces affect lattice disordering processes and defect transport. Here we explore the evolution of local disorder in ion-irradiated La2Ti2O7/SrTiO3 thin film heterostructures using a combination of high-resolution scanning transmission electron microscopy (STEM), position-averaged convergent beam electron diffraction (PACBED), electron energy loss spectroscopy (STEM-EELS), and ab initio theory calculations. We observe highly non-uniform lattice disordering driven by asymmetric oxygen vacancy formation across the interface. Our calculations indicate that this asymmetry results from differences in the polyhedral connectivity and vacancy formation energies of the two interface components, suggesting ways to manipulate lattice disorder in functional oxide heterostructures.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1600867
Report Number(s):
PNNL-SA--148989; 1901944
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
Germany
Language:
English

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