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Enhancement of the Grain Boundary Conductivity in Ceramic Li 0.34 La 0.55 TiO 3 Electrolytes in a Moisture‐Free Processing Environment
Author(s) -
Aguesse Frederic,
López del Amo Juan Miguel,
Roddatis Vladimir,
Aguadero Ainara,
Kilner John A.
Publication year - 2014
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201300143
Subject(s) - materials science , grain boundary , ceramic , conductivity , grain boundary diffusion coefficient , electrical resistivity and conductivity , moisture , atmosphere (unit) , analytical chemistry (journal) , dielectric spectroscopy , perovskite (structure) , diffusion , electrolyte , fast ion conductor , phase (matter) , oxygen , mineralogy , chemical engineering , composite material , microstructure , electrode , thermodynamics , chemistry , physics , organic chemistry , chromatography , electrochemistry , electrical engineering , engineering
The grain boundary resistivity problem of highly conductive bulk Li 0.34 La 0.55 TiO 3 perovskite has been investigated by means of impedance spectroscopy and solid‐state NMR of samples processed in controlled atmospheres. The samples were sintered in air, synthetic air, and oxygen, in which the level of moisture varied. A dry atmosphere is critical to obtain dense ceramics with a low grain boundary resistivity. The grain boundary conductivity is five times higher for samples sintered in oxygen atmosphere due to the suppression of Li 2 CO 3 secondary phase formation, which is responsible for low lithium ion diffusion at the grain boundary.