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Properties of Flame Sprayed Ce 0.8 Gd 0.2 O 1.9‐δ Electrolyte Thin Films
Author(s) -
Karageorgakis Nikolaos I.,
Heel Andre,
Rupp Jennifer L. M.,
Aguirre Myriam H.,
Graule Thomas,
Gauckler Ludwig J.
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201001622
Subject(s) - materials science , nanocrystalline material , amorphous solid , thin film , microstructure , annealing (glass) , nanoindentation , electrolyte , grain size , composite material , analytical chemistry (journal) , conductivity , electrical resistivity and conductivity , chemical engineering , nanotechnology , crystallography , electrode , chemistry , engineering , chromatography , electrical engineering
Thin films of Ce 0.8 Gd 0.2 O 1.9‐δ (CGO) are deposited by flame spray deposition with a deposition rate of about 30 nm min −1 . The films (deposited at 200 °C) are dense, smooth, and particle‐free and show a biphasic amorphous/nanocrystalline microstructure. Isothermal grain growth and microstrain are determined as a function of dwell time and temperature and correlated to the electrical conductivity. CGO films annealed for 10 h at 600 °C present the best electrical conductivity of 0.46 S m −1 measured at 550 °C. Reasons for the superior performance of films annealed at low temperature over higher‐temperature‐treated samples are discussed and include grain‐size evolution, microstrain relaxation, and chemical decomposition. Nanoindentation measurements are conducted on the CGO thin films as a function of annealing temperature to determine the hardness and elastic modulus of the films for potential application as free‐standing electrolyte membranes in low‐temperature micro‐SOFCs (solid oxide fuel cells).