(Invited) Effects of Microstructure on Surface Segregation: Role of Grain Boundaries | Zendy

Helena Téllez | Zendy; John Druce | Zendy; Tatsumi Ishihara | Zendy; John A. Kilner | Zendy

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(Invited) Effects of Microstructure on Surface Segregation: Role of Grain Boundaries

Author(s) -

Helena Téllez,

John Druce,

Tatsumi Ishihara,

John A. Kilner

Publication year - 2016

Publication title -

ecs transactions

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.235

H-Index - 52

eISSN - 1938-6737

pISSN - 1938-5862

DOI - 10.1149/07207.0057ecst

Subject(s) - grain boundary , microstructure , materials science , strontium , annealing (glass) , impurity , precipitation , grain boundary diffusion coefficient , grain boundary strengthening , grain size , ceramic , diffusion , mineralogy , metallurgy , analytical chemistry (journal) , chemistry , thermodynamics , physics , organic chemistry , chromatography , meteorology

The effects of microstructure on the kinetics of strontium segregation in La0.6Sr0.4CoO3-δ ceramic samples are investigated. A faster segregation of the Sr cations towards the surface was observed after annealing for 1 h at 600 °C in dry oxygen (pO2= 200 mbar) as the density of grain boundaries at the surface increases (i.e. with a decrease of the grain size). The presence of surface impurities, such as Na, partially inhibits the Sr segregation towards the surface. Optical micrographs and ToF-SIMS chemical imaging showed that the segregation and precipitation of Sr starts at the grain boundaries, with an apparent enrichment of the surface around the grain boundary via Sr surface diffusion

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